Mercurial > cpython-lru_cache-weakref

annotate Modules/signalmodule.c @ 78069:a8aa77458e12 3.2

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Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents 7b24dd587a7b
children ba45976c2801 a0100852b6fe
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1
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2 /* Signal module -- many thanks to Lance Ellinghaus */
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3
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4 /* XXX Signals should be recorded per thread, now we have thread state. */
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5
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6 #include "Python.h"
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7
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8 #ifdef MS_WINDOWS
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9 #include <Windows.h>
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10 #ifdef HAVE_PROCESS_H
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11 #include <process.h>
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12 #endif
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13 #endif
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15 #ifdef HAVE_SIGNAL_H
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16 #include <signal.h>
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17 #endif
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18 #ifdef HAVE_SYS_STAT_H
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19 #include <sys/stat.h>
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20 #endif
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21 #ifdef HAVE_SYS_TIME_H
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22 #include <sys/time.h>
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23 #endif
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25 #ifndef SIG_ERR
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26 #define SIG_ERR ((PyOS_sighandler_t)(-1))
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27 #endif
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29 #if defined(PYOS_OS2) && !defined(PYCC_GCC)
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30 #define NSIG 12
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31 #include <process.h>
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32 #endif
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34 #ifndef NSIG
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35 # if defined(_NSIG)
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36 # define NSIG _NSIG /* For BSD/SysV */
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37 # elif defined(_SIGMAX)
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38 # define NSIG (_SIGMAX + 1) /* For QNX */
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39 # elif defined(SIGMAX)
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40 # define NSIG (SIGMAX + 1) /* For djgpp */
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41 # else
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42 # define NSIG 64 /* Use a reasonable default value */
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43 # endif
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44 #endif
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47 /*
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48 NOTES ON THE INTERACTION BETWEEN SIGNALS AND THREADS
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49
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50 When threads are supported, we want the following semantics:
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51
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52 - only the main thread can set a signal handler
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53 - any thread can get a signal handler
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54 - signals are only delivered to the main thread
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55
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56 I.e. we don't support "synchronous signals" like SIGFPE (catching
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57 this doesn't make much sense in Python anyway) nor do we support
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58 signals as a means of inter-thread communication, since not all
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59 thread implementations support that (at least our thread library
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60 doesn't).
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62 We still have the problem that in some implementations signals
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63 generated by the keyboard (e.g. SIGINT) are delivered to all
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64 threads (e.g. SGI), while in others (e.g. Solaris) such signals are
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65 delivered to one random thread (an intermediate possibility would
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66 be to deliver it to the main thread -- POSIX?). For now, we have
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67 a working implementation that works in all three cases -- the
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68 handler ignores signals if getpid() isn't the same as in the main
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69 thread. XXX This is a hack.
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70
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71 GNU pth is a user-space threading library, and as such, all threads
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72 run within the same process. In this case, if the currently running
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73 thread is not the main_thread, send the signal to the main_thread.
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74 */
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75
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76 #ifdef WITH_THREAD
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77 #include <sys/types.h> /* For pid_t */
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78 #include "pythread.h"
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79 static long main_thread;
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80 static pid_t main_pid;
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81 #endif
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82
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83 static volatile struct {
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84 sig_atomic_t tripped;
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85 PyObject *func;
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86 } Handlers[NSIG];
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87
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88 static volatile sig_atomic_t wakeup_fd = -1;
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89
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90 /* Speed up sigcheck() when none tripped */
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91 static volatile sig_atomic_t is_tripped = 0;
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92
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93 static PyObject *DefaultHandler;
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94 static PyObject *IgnoreHandler;
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95 static PyObject *IntHandler;
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96
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97 /* On Solaris 8, gcc will produce a warning that the function
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98 declaration is not a prototype. This is caused by the definition of
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99 SIG_DFL as (void (*)())0; the correct declaration would have been
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100 (void (*)(int))0. */
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101
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102 static PyOS_sighandler_t old_siginthandler = SIG_DFL;
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103
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104 #ifdef HAVE_GETITIMER
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105 static PyObject *ItimerError;
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106
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107 /* auxiliary functions for setitimer/getitimer */
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108 static void
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109 timeval_from_double(double d, struct timeval *tv)
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110 {
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111 tv->tv_sec = floor(d);
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112 tv->tv_usec = fmod(d, 1.0) * 1000000.0;
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113 }
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114
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115 Py_LOCAL_INLINE(double)
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116 double_from_timeval(struct timeval *tv)
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117 {
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118 return tv->tv_sec + (double)(tv->tv_usec / 1000000.0);
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119 }
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120
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121 static PyObject *
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122 itimer_retval(struct itimerval *iv)
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123 {
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124 PyObject *r, *v;
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125
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126 r = PyTuple_New(2);
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127 if (r == NULL)
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128 return NULL;
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129
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130 if(!(v = PyFloat_FromDouble(double_from_timeval(&iv->it_value)))) {
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131 Py_DECREF(r);
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132 return NULL;
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133 }
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134
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135 PyTuple_SET_ITEM(r, 0, v);
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136
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137 if(!(v = PyFloat_FromDouble(double_from_timeval(&iv->it_interval)))) {
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138 Py_DECREF(r);
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139 return NULL;
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140 }
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141
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142 PyTuple_SET_ITEM(r, 1, v);
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143
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144 return r;
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145 }
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146 #endif
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147
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148 static PyObject *
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149 signal_default_int_handler(PyObject *self, PyObject *args)
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150 {
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151 PyErr_SetNone(PyExc_KeyboardInterrupt);
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152 return NULL;
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153 }
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154
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155 PyDoc_STRVAR(default_int_handler_doc,
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156 "default_int_handler(...)\n\
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157 \n\
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158 The default handler for SIGINT installed by Python.\n\
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159 It raises KeyboardInterrupt.");
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160
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161
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162 static int
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163 checksignals_witharg(void * unused)
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164 {
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165 return PyErr_CheckSignals();
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166 }
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167
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168 static void
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169 trip_signal(int sig_num)
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170 {
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171 Handlers[sig_num].tripped = 1;
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172 if (is_tripped)
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173 return;
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174 /* Set is_tripped after setting .tripped, as it gets
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175 cleared in PyErr_CheckSignals() before .tripped. */
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176 is_tripped = 1;
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177 Py_AddPendingCall(checksignals_witharg, NULL);
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178 if (wakeup_fd != -1)
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179 write(wakeup_fd, "\0", 1);
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180 }
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181
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182 static void
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183 signal_handler(int sig_num)
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184 {
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185 int save_errno = errno;
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186
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187 #if defined(WITH_THREAD) && defined(WITH_PTH)
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188 if (PyThread_get_thread_ident() != main_thread) {
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189 pth_raise(*(pth_t *) main_thread, sig_num);
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190 }
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191 else
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192 #endif
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193 {
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194 #ifdef WITH_THREAD
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195 /* See NOTES section above */
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196 if (getpid() == main_pid)
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197 #endif
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198 {
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199 trip_signal(sig_num);
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200 }
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201
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202 #ifndef HAVE_SIGACTION
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203 #ifdef SIGCHLD
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204 /* To avoid infinite recursion, this signal remains
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205 reset until explicit re-instated.
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206 Don't clear the 'func' field as it is our pointer
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207 to the Python handler... */
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208 if (sig_num != SIGCHLD)
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209 #endif
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210 /* If the handler was not set up with sigaction, reinstall it. See
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211 * Python/pythonrun.c for the implementation of PyOS_setsig which
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212 * makes this true. See also issue8354. */
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213 PyOS_setsig(sig_num, signal_handler);
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214 #endif
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215 }
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216
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217 /* Issue #10311: asynchronously executing signal handlers should not
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218 mutate errno under the feet of unsuspecting C code. */
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219 errno = save_errno;
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220 }
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221
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222
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223 #ifdef HAVE_ALARM
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224 static PyObject *
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225 signal_alarm(PyObject *self, PyObject *args)
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226 {
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227 int t;
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228 if (!PyArg_ParseTuple(args, "i:alarm", &t))
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229 return NULL;
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230 /* alarm() returns the number of seconds remaining */
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231 return PyLong_FromLong((long)alarm(t));
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232 }
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233
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234 PyDoc_STRVAR(alarm_doc,
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235 "alarm(seconds)\n\
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236 \n\
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237 Arrange for SIGALRM to arrive after the given number of seconds.");
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238 #endif
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239
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240 #ifdef HAVE_PAUSE
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241 static PyObject *
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242 signal_pause(PyObject *self)
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243 {
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244 Py_BEGIN_ALLOW_THREADS
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245 (void)pause();
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246 Py_END_ALLOW_THREADS
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247 /* make sure that any exceptions that got raised are propagated
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248 * back into Python
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249 */
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250 if (PyErr_CheckSignals())
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251 return NULL;
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252
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253 Py_INCREF(Py_None);
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254 return Py_None;
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255 }
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256 PyDoc_STRVAR(pause_doc,
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257 "pause()\n\
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258 \n\
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259 Wait until a signal arrives.");
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260
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261 #endif
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262
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263
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264 static PyObject *
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265 signal_signal(PyObject *self, PyObject *args)
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266 {
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267 PyObject *obj;
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268 int sig_num;
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269 PyObject *old_handler;
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270 void (*func)(int);
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271 if (!PyArg_ParseTuple(args, "iO:signal", &sig_num, &obj))
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272 return NULL;
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273 #ifdef MS_WINDOWS
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274 /* Validate that sig_num is one of the allowable signals */
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275 switch (sig_num) {
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276 case SIGABRT: break;
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277 #ifdef SIGBREAK
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278 /* Issue #10003: SIGBREAK is not documented as permitted, but works
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279 and corresponds to CTRL_BREAK_EVENT. */
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280 case SIGBREAK: break;
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281 #endif
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282 case SIGFPE: break;
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283 case SIGILL: break;
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284 case SIGINT: break;
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285 case SIGSEGV: break;
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286 case SIGTERM: break;
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287 default:
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288 PyErr_SetString(PyExc_ValueError, "invalid signal value");
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289 return NULL;
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290 }
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291 #endif
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292 #ifdef WITH_THREAD
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293 if (PyThread_get_thread_ident() != main_thread) {
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294 PyErr_SetString(PyExc_ValueError,
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295 "signal only works in main thread");
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296 return NULL;
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297 }
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298 #endif
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299 if (sig_num < 1 || sig_num >= NSIG) {
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300 PyErr_SetString(PyExc_ValueError,
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301 "signal number out of range");
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302 return NULL;
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303 }
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304 if (obj == IgnoreHandler)
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305 func = SIG_IGN;
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306 else if (obj == DefaultHandler)
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307 func = SIG_DFL;
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308 else if (!PyCallable_Check(obj)) {
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309 PyErr_SetString(PyExc_TypeError,
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310 "signal handler must be signal.SIG_IGN, signal.SIG_DFL, or a callable object");
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311 return NULL;
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312 }
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313 else
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314 func = signal_handler;
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315 if (PyOS_setsig(sig_num, func) == SIG_ERR) {
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316 PyErr_SetFromErrno(PyExc_RuntimeError);
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317 return NULL;
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318 }
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319 old_handler = Handlers[sig_num].func;
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320 Handlers[sig_num].tripped = 0;
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321 Py_INCREF(obj);
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322 Handlers[sig_num].func = obj;
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323 return old_handler;
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324 }
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325
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326 PyDoc_STRVAR(signal_doc,
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327 "signal(sig, action) -> action\n\
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328 \n\
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329 Set the action for the given signal. The action can be SIG_DFL,\n\
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330 SIG_IGN, or a callable Python object. The previous action is\n\
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331 returned. See getsignal() for possible return values.\n\
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332 \n\
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333 *** IMPORTANT NOTICE ***\n\
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334 A signal handler function is called with two arguments:\n\
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335 the first is the signal number, the second is the interrupted stack frame.");
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336
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337
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338 static PyObject *
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339 signal_getsignal(PyObject *self, PyObject *args)
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340 {
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341 int sig_num;
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342 PyObject *old_handler;
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343 if (!PyArg_ParseTuple(args, "i:getsignal", &sig_num))
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344 return NULL;
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345 if (sig_num < 1 || sig_num >= NSIG) {
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346 PyErr_SetString(PyExc_ValueError,
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347 "signal number out of range");
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348 return NULL;
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349 }
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350 old_handler = Handlers[sig_num].func;
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351 Py_INCREF(old_handler);
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352 return old_handler;
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353 }
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354
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355 PyDoc_STRVAR(getsignal_doc,
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356 "getsignal(sig) -> action\n\
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357 \n\
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358 Return the current action for the given signal. The return value can be:\n\
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359 SIG_IGN -- if the signal is being ignored\n\
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360 SIG_DFL -- if the default action for the signal is in effect\n\
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361 None -- if an unknown handler is in effect\n\
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362 anything else -- the callable Python object used as a handler");
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363
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364 #ifdef HAVE_SIGINTERRUPT
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365 PyDoc_STRVAR(siginterrupt_doc,
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366 "siginterrupt(sig, flag) -> None\n\
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367 change system call restart behaviour: if flag is False, system calls\n\
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368 will be restarted when interrupted by signal sig, else system calls\n\
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369 will be interrupted.");
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370
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371 static PyObject *
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372 signal_siginterrupt(PyObject *self, PyObject *args)
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373 {
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374 int sig_num;
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375 int flag;
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376
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377 if (!PyArg_ParseTuple(args, "ii:siginterrupt", &sig_num, &flag))
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378 return NULL;
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379 if (sig_num < 1 || sig_num >= NSIG) {
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380 PyErr_SetString(PyExc_ValueError,
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381 "signal number out of range");
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382 return NULL;
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383 }
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384 if (siginterrupt(sig_num, flag)<0) {
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385 PyErr_SetFromErrno(PyExc_RuntimeError);
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386 return NULL;
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387 }
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388
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389 Py_INCREF(Py_None);
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390 return Py_None;
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391 }
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392
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393 #endif
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394
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395 static PyObject *
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396 signal_set_wakeup_fd(PyObject *self, PyObject *args)
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397 {
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398 struct stat buf;
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399 int fd, old_fd;
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400 if (!PyArg_ParseTuple(args, "i:set_wakeup_fd", &fd))
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401 return NULL;
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402 #ifdef WITH_THREAD
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403 if (PyThread_get_thread_ident() != main_thread) {
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404 PyErr_SetString(PyExc_ValueError,
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405 "set_wakeup_fd only works in main thread");
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406 return NULL;
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407 }
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408 #endif
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409 if (fd != -1 && fstat(fd, &buf) != 0) {
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410 PyErr_SetString(PyExc_ValueError, "invalid fd");
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411 return NULL;
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412 }
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413 old_fd = wakeup_fd;
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414 wakeup_fd = fd;
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415 return PyLong_FromLong(old_fd);
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416 }
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417
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418 PyDoc_STRVAR(set_wakeup_fd_doc,
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419 "set_wakeup_fd(fd) -> fd\n\
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420 \n\
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421 Sets the fd to be written to (with '\\0') when a signal\n\
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422 comes in. A library can use this to wakeup select or poll.\n\
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423 The previous fd is returned.\n\
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424 \n\
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425 The fd must be non-blocking.");
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426
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427 /* C API for the same, without all the error checking */
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428 int
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429 PySignal_SetWakeupFd(int fd)
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430 {
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431 int old_fd = wakeup_fd;
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432 if (fd < 0)
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433 fd = -1;
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434 wakeup_fd = fd;
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435 return old_fd;
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436 }
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437
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438
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439 #ifdef HAVE_SETITIMER
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440 static PyObject *
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441 signal_setitimer(PyObject *self, PyObject *args)
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442 {
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443 double first;
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444 double interval = 0;
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445 int which;
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446 struct itimerval new, old;
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447
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448 if(!PyArg_ParseTuple(args, "id|d:setitimer", &which, &first, &interval))
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449 return NULL;
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450
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451 timeval_from_double(first, &new.it_value);
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452 timeval_from_double(interval, &new.it_interval);
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453 /* Let OS check "which" value */
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454 if (setitimer(which, &new, &old) != 0) {
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455 PyErr_SetFromErrno(ItimerError);
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456 return NULL;
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457 }
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458
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459 return itimer_retval(&old);
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460 }
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461
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462 PyDoc_STRVAR(setitimer_doc,
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463 "setitimer(which, seconds[, interval])\n\
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464 \n\
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465 Sets given itimer (one of ITIMER_REAL, ITIMER_VIRTUAL\n\
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466 or ITIMER_PROF) to fire after value seconds and after\n\
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467 that every interval seconds.\n\
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468 The itimer can be cleared by setting seconds to zero.\n\
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469 \n\
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470 Returns old values as a tuple: (delay, interval).");
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471 #endif
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472
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473
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474 #ifdef HAVE_GETITIMER
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475 static PyObject *
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476 signal_getitimer(PyObject *self, PyObject *args)
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477 {
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478 int which;
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479 struct itimerval old;
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480
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481 if (!PyArg_ParseTuple(args, "i:getitimer", &which))
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482 return NULL;
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483
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484 if (getitimer(which, &old) != 0) {
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485 PyErr_SetFromErrno(ItimerError);
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486 return NULL;
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487 }
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488
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489 return itimer_retval(&old);
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490 }
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491
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492 PyDoc_STRVAR(getitimer_doc,
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493 "getitimer(which)\n\
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494 \n\
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495 Returns current value of given itimer.");
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496 #endif
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497
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498
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499 /* List of functions defined in the module */
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500 static PyMethodDef signal_methods[] = {
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501 #ifdef HAVE_ALARM
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502 {"alarm", signal_alarm, METH_VARARGS, alarm_doc},
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503 #endif
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504 #ifdef HAVE_SETITIMER
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505 {"setitimer", signal_setitimer, METH_VARARGS, setitimer_doc},
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506 #endif
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507 #ifdef HAVE_GETITIMER
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508 {"getitimer", signal_getitimer, METH_VARARGS, getitimer_doc},
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509 #endif
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510 {"signal", signal_signal, METH_VARARGS, signal_doc},
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511 {"getsignal", signal_getsignal, METH_VARARGS, getsignal_doc},
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512 {"set_wakeup_fd", signal_set_wakeup_fd, METH_VARARGS, set_wakeup_fd_doc},
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513 #ifdef HAVE_SIGINTERRUPT
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514 {"siginterrupt", signal_siginterrupt, METH_VARARGS, siginterrupt_doc},
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515 #endif
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516 #ifdef HAVE_PAUSE
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517 {"pause", (PyCFunction)signal_pause,
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518 METH_NOARGS,pause_doc},
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519 #endif
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520 {"default_int_handler", signal_default_int_handler,
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521 METH_VARARGS, default_int_handler_doc},
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522 {NULL, NULL} /* sentinel */
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523 };
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524
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525
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526 PyDoc_STRVAR(module_doc,
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527 "This module provides mechanisms to use signal handlers in Python.\n\
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528 \n\
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529 Functions:\n\
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530 \n\
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diff changeset
531 alarm() -- cause SIGALRM after a specified time [Unix only]\n\
46054
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532 setitimer() -- cause a signal (described below) after a specified\n\
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533 float time and the timer may restart then [Unix only]\n\
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534 getitimer() -- get current value of timer [Unix only]\n\
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535 signal() -- set the action for a given signal\n\
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536 getsignal() -- get the signal action for a given signal\n\
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Guido van Rossum <guido@python.org>
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diff changeset
537 pause() -- wait until a signal arrives [Unix only]\n\
bd695de18ecf Added doc strings.
Guido van Rossum <guido@python.org>
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538 default_int_handler() -- default SIGINT handler\n\
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539 \n\
46054
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540 signal constants:\n\
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diff changeset
541 SIG_DFL -- used to refer to the system default handler\n\
bd695de18ecf Added doc strings.
Guido van Rossum <guido@python.org>
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542 SIG_IGN -- used to ignore the signal\n\
bd695de18ecf Added doc strings.
Guido van Rossum <guido@python.org>
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543 NSIG -- number of defined signals\n\
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Guido van Rossum <guido@python.org>
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diff changeset
544 SIGINT, SIGTERM, etc. -- signal numbers\n\
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545 \n\
46054
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546 itimer constants:\n\
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547 ITIMER_REAL -- decrements in real time, and delivers SIGALRM upon\n\
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
548 expiration\n\
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549 ITIMER_VIRTUAL -- decrements only when the process is executing,\n\
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550 and delivers SIGVTALRM upon expiration\n\
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551 ITIMER_PROF -- decrements both when the process is executing and\n\
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552 when the system is executing on behalf of the process.\n\
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553 Coupled with ITIMER_VIRTUAL, this timer is usually\n\
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554 used to profile the time spent by the application\n\
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555 in user and kernel space. SIGPROF is delivered upon\n\
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556 expiration.\n\
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557 \n\n\
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558 *** IMPORTANT NOTICE ***\n\
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559 A signal handler function is called with two arguments:\n\
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Martin v. Löwis <martin@v.loewis.de>
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560 the first is the signal number, the second is the interrupted stack frame.");
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561
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562 static struct PyModuleDef signalmodule = {
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563 PyModuleDef_HEAD_INIT,
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564 "signal",
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565 module_doc,
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566 -1,
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567 signal_methods,
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568 NULL,
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569 NULL,
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570 NULL,
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571 NULL
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572 };
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573
24471
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Mark Hammond <mhammond@skippinet.com.au>
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574 PyMODINIT_FUNC
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575 PyInit_signal(void)
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576 {
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577 PyObject *m, *d, *x;
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diff changeset
578 int i;
1678
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diff changeset
579
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diff changeset
580 #ifdef WITH_THREAD
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581 main_thread = PyThread_get_thread_ident();
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582 main_pid = getpid();
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583 #endif
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584
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585 /* Create the module and add the functions */
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586 m = PyModule_Create(&signalmodule);
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587 if (m == NULL)
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588 return NULL;
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589
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590 /* Add some symbolic constants to the module */
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591 d = PyModule_GetDict(m);
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592
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593 x = DefaultHandler = PyLong_FromVoidPtr((void *)SIG_DFL);
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594 if (!x || PyDict_SetItemString(d, "SIG_DFL", x) < 0)
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595 goto finally;
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596
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597 x = IgnoreHandler = PyLong_FromVoidPtr((void *)SIG_IGN);
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598 if (!x || PyDict_SetItemString(d, "SIG_IGN", x) < 0)
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599 goto finally;
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diff changeset
600
61467
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601 x = PyLong_FromLong((long)NSIG);
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602 if (!x || PyDict_SetItemString(d, "NSIG", x) < 0)
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603 goto finally;
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604 Py_DECREF(x);
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605
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606 x = IntHandler = PyDict_GetItemString(d, "default_int_handler");
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diff changeset
607 if (!x)
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608 goto finally;
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609 Py_INCREF(IntHandler);
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610
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611 Handlers[0].tripped = 0;
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612 for (i = 1; i < NSIG; i++) {
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613 void (*t)(int);
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614 t = PyOS_getsig(i);
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615 Handlers[i].tripped = 0;
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616 if (t == SIG_DFL)
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617 Handlers[i].func = DefaultHandler;
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618 else if (t == SIG_IGN)
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619 Handlers[i].func = IgnoreHandler;
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620 else
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621 Handlers[i].func = Py_None; /* None of our business */
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622 Py_INCREF(Handlers[i].func);
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623 }
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624 if (Handlers[SIGINT].func == DefaultHandler) {
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625 /* Install default int handler */
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626 Py_INCREF(IntHandler);
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627 Py_DECREF(Handlers[SIGINT].func);
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628 Handlers[SIGINT].func = IntHandler;
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diff changeset
629 old_siginthandler = PyOS_setsig(SIGINT, signal_handler);
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630 }
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631
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diff changeset
632 #ifdef SIGHUP
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633 x = PyLong_FromLong(SIGHUP);
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634 PyDict_SetItemString(d, "SIGHUP", x);
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635 Py_XDECREF(x);
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diff changeset
636 #endif
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diff changeset
637 #ifdef SIGINT
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638 x = PyLong_FromLong(SIGINT);
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639 PyDict_SetItemString(d, "SIGINT", x);
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640 Py_XDECREF(x);
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641 #endif
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642 #ifdef SIGBREAK
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643 x = PyLong_FromLong(SIGBREAK);
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644 PyDict_SetItemString(d, "SIGBREAK", x);
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645 Py_XDECREF(x);
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646 #endif
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647 #ifdef SIGQUIT
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648 x = PyLong_FromLong(SIGQUIT);
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649 PyDict_SetItemString(d, "SIGQUIT", x);
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650 Py_XDECREF(x);
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651 #endif
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652 #ifdef SIGILL
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653 x = PyLong_FromLong(SIGILL);
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654 PyDict_SetItemString(d, "SIGILL", x);
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655 Py_XDECREF(x);
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656 #endif
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657 #ifdef SIGTRAP
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658 x = PyLong_FromLong(SIGTRAP);
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659 PyDict_SetItemString(d, "SIGTRAP", x);
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660 Py_XDECREF(x);
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661 #endif
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662 #ifdef SIGIOT
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663 x = PyLong_FromLong(SIGIOT);
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664 PyDict_SetItemString(d, "SIGIOT", x);
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665 Py_XDECREF(x);
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666 #endif
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667 #ifdef SIGABRT
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668 x = PyLong_FromLong(SIGABRT);
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669 PyDict_SetItemString(d, "SIGABRT", x);
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670 Py_XDECREF(x);
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671 #endif
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672 #ifdef SIGEMT
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673 x = PyLong_FromLong(SIGEMT);
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674 PyDict_SetItemString(d, "SIGEMT", x);
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675 Py_XDECREF(x);
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676 #endif
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677 #ifdef SIGFPE
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678 x = PyLong_FromLong(SIGFPE);
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679 PyDict_SetItemString(d, "SIGFPE", x);
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680 Py_XDECREF(x);
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681 #endif
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682 #ifdef SIGKILL
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683 x = PyLong_FromLong(SIGKILL);
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684 PyDict_SetItemString(d, "SIGKILL", x);
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685 Py_XDECREF(x);
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686 #endif
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687 #ifdef SIGBUS
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688 x = PyLong_FromLong(SIGBUS);
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689 PyDict_SetItemString(d, "SIGBUS", x);
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690 Py_XDECREF(x);
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691 #endif
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692 #ifdef SIGSEGV
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693 x = PyLong_FromLong(SIGSEGV);
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694 PyDict_SetItemString(d, "SIGSEGV", x);
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695 Py_XDECREF(x);
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696 #endif
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697 #ifdef SIGSYS
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698 x = PyLong_FromLong(SIGSYS);
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699 PyDict_SetItemString(d, "SIGSYS", x);
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700 Py_XDECREF(x);
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701 #endif
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702 #ifdef SIGPIPE
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703 x = PyLong_FromLong(SIGPIPE);
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704 PyDict_SetItemString(d, "SIGPIPE", x);
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705 Py_XDECREF(x);
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706 #endif
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707 #ifdef SIGALRM
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708 x = PyLong_FromLong(SIGALRM);
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709 PyDict_SetItemString(d, "SIGALRM", x);
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710 Py_XDECREF(x);
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711 #endif
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712 #ifdef SIGTERM
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713 x = PyLong_FromLong(SIGTERM);
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714 PyDict_SetItemString(d, "SIGTERM", x);
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715 Py_XDECREF(x);
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716 #endif
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717 #ifdef SIGUSR1
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718 x = PyLong_FromLong(SIGUSR1);
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719 PyDict_SetItemString(d, "SIGUSR1", x);
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720 Py_XDECREF(x);
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721 #endif
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722 #ifdef SIGUSR2
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723 x = PyLong_FromLong(SIGUSR2);
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724 PyDict_SetItemString(d, "SIGUSR2", x);
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725 Py_XDECREF(x);
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726 #endif
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727 #ifdef SIGCLD
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728 x = PyLong_FromLong(SIGCLD);
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729 PyDict_SetItemString(d, "SIGCLD", x);
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730 Py_XDECREF(x);
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731 #endif
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732 #ifdef SIGCHLD
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733 x = PyLong_FromLong(SIGCHLD);
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734 PyDict_SetItemString(d, "SIGCHLD", x);
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735 Py_XDECREF(x);
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736 #endif
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737 #ifdef SIGPWR
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738 x = PyLong_FromLong(SIGPWR);
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739 PyDict_SetItemString(d, "SIGPWR", x);
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740 Py_XDECREF(x);
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741 #endif
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742 #ifdef SIGIO
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743 x = PyLong_FromLong(SIGIO);
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744 PyDict_SetItemString(d, "SIGIO", x);
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745 Py_XDECREF(x);
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746 #endif
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747 #ifdef SIGURG
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748 x = PyLong_FromLong(SIGURG);
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749 PyDict_SetItemString(d, "SIGURG", x);
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750 Py_XDECREF(x);
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751 #endif
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752 #ifdef SIGWINCH
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753 x = PyLong_FromLong(SIGWINCH);
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754 PyDict_SetItemString(d, "SIGWINCH", x);
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755 Py_XDECREF(x);
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756 #endif
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757 #ifdef SIGPOLL
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758 x = PyLong_FromLong(SIGPOLL);
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759 PyDict_SetItemString(d, "SIGPOLL", x);
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760 Py_XDECREF(x);
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761 #endif
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762 #ifdef SIGSTOP
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763 x = PyLong_FromLong(SIGSTOP);
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764 PyDict_SetItemString(d, "SIGSTOP", x);
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765 Py_XDECREF(x);
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766 #endif
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767 #ifdef SIGTSTP
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768 x = PyLong_FromLong(SIGTSTP);
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769 PyDict_SetItemString(d, "SIGTSTP", x);
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770 Py_XDECREF(x);
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771 #endif
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772 #ifdef SIGCONT
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773 x = PyLong_FromLong(SIGCONT);
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774 PyDict_SetItemString(d, "SIGCONT", x);
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775 Py_XDECREF(x);
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diff changeset
776 #endif
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777 #ifdef SIGTTIN
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778 x = PyLong_FromLong(SIGTTIN);
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779 PyDict_SetItemString(d, "SIGTTIN", x);
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780 Py_XDECREF(x);
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diff changeset
781 #endif
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782 #ifdef SIGTTOU
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783 x = PyLong_FromLong(SIGTTOU);
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diff changeset
784 PyDict_SetItemString(d, "SIGTTOU", x);
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785 Py_XDECREF(x);
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786 #endif
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787 #ifdef SIGVTALRM
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788 x = PyLong_FromLong(SIGVTALRM);
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789 PyDict_SetItemString(d, "SIGVTALRM", x);
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790 Py_XDECREF(x);
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diff changeset
791 #endif
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792 #ifdef SIGPROF
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793 x = PyLong_FromLong(SIGPROF);
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794 PyDict_SetItemString(d, "SIGPROF", x);
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795 Py_XDECREF(x);
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diff changeset
796 #endif
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797 #ifdef SIGXCPU
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798 x = PyLong_FromLong(SIGXCPU);
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799 PyDict_SetItemString(d, "SIGXCPU", x);
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800 Py_XDECREF(x);
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801 #endif
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802 #ifdef SIGXFSZ
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803 x = PyLong_FromLong(SIGXFSZ);
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804 PyDict_SetItemString(d, "SIGXFSZ", x);
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805 Py_XDECREF(x);
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806 #endif
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807 #ifdef SIGRTMIN
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808 x = PyLong_FromLong(SIGRTMIN);
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809 PyDict_SetItemString(d, "SIGRTMIN", x);
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810 Py_XDECREF(x);
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811 #endif
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812 #ifdef SIGRTMAX
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813 x = PyLong_FromLong(SIGRTMAX);
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814 PyDict_SetItemString(d, "SIGRTMAX", x);
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815 Py_XDECREF(x);
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816 #endif
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817 #ifdef SIGINFO
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818 x = PyLong_FromLong(SIGINFO);
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819 PyDict_SetItemString(d, "SIGINFO", x);
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820 Py_XDECREF(x);
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Martin v. Löwis <martin@v.loewis.de>
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821 #endif
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822
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823 #ifdef ITIMER_REAL
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824 x = PyLong_FromLong(ITIMER_REAL);
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825 PyDict_SetItemString(d, "ITIMER_REAL", x);
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826 Py_DECREF(x);
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827 #endif
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828 #ifdef ITIMER_VIRTUAL
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diff changeset
829 x = PyLong_FromLong(ITIMER_VIRTUAL);
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830 PyDict_SetItemString(d, "ITIMER_VIRTUAL", x);
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831 Py_DECREF(x);
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832 #endif
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833 #ifdef ITIMER_PROF
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834 x = PyLong_FromLong(ITIMER_PROF);
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835 PyDict_SetItemString(d, "ITIMER_PROF", x);
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836 Py_DECREF(x);
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837 #endif
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838
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diff changeset
839 #if defined (HAVE_SETITIMER) || defined (HAVE_GETITIMER)
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840 ItimerError = PyErr_NewException("signal.ItimerError",
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841 PyExc_IOError, NULL);
48848
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842 if (ItimerError != NULL)
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843 PyDict_SetItemString(d, "ItimerError", ItimerError);
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844 #endif
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845
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846 #ifdef CTRL_C_EVENT
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847 x = PyLong_FromLong(CTRL_C_EVENT);
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848 PyDict_SetItemString(d, "CTRL_C_EVENT", x);
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849 Py_DECREF(x);
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850 #endif
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851
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852 #ifdef CTRL_BREAK_EVENT
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853 x = PyLong_FromLong(CTRL_BREAK_EVENT);
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854 PyDict_SetItemString(d, "CTRL_BREAK_EVENT", x);
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855 Py_DECREF(x);
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856 #endif
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857
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858 if (PyErr_Occurred()) {
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859 Py_DECREF(m);
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diff changeset
860 m = NULL;
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861 }
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862
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diff changeset
863 finally:
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864 return m;
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865 }
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866
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diff changeset
867 static void
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diff changeset
868 finisignal(void)
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869 {
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870 int i;
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871 PyObject *func;
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872
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873 PyOS_setsig(SIGINT, old_siginthandler);
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874 old_siginthandler = SIG_DFL;
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875
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876 for (i = 1; i < NSIG; i++) {
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877 func = Handlers[i].func;
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878 Handlers[i].tripped = 0;
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879 Handlers[i].func = NULL;
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880 if (i != SIGINT && func != NULL && func != Py_None &&
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diff changeset
881 func != DefaultHandler && func != IgnoreHandler)
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882 PyOS_setsig(i, SIG_DFL);
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diff changeset
883 Py_XDECREF(func);
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884 }
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diff changeset
885
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886 Py_XDECREF(IntHandler);
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887 IntHandler = NULL;
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888 Py_XDECREF(DefaultHandler);
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889 DefaultHandler = NULL;
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890 Py_XDECREF(IgnoreHandler);
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891 IgnoreHandler = NULL;
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892 }
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893
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894
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895 /* Declared in pyerrors.h */
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896 int
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897 PyErr_CheckSignals(void)
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898 {
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899 int i;
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900 PyObject *f;
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901
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902 if (!is_tripped)
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903 return 0;
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904
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Guido van Rossum <guido@python.org>
parents: 1658
diff changeset
905 #ifdef WITH_THREAD
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906 if (PyThread_get_thread_ident() != main_thread)
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907 return 0;
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parents: 1658
diff changeset
908 #endif
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Christian Heimes <christian@cheimes.de>
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diff changeset
909
61467
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910 /*
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911 * The is_tripped variable is meant to speed up the calls to
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912 * PyErr_CheckSignals (both directly or via pending calls) when no
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diff changeset
913 * signal has arrived. This variable is set to 1 when a signal arrives
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parents: 61452
diff changeset
914 * and it is set to 0 here, when we know some signals arrived. This way
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
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parents: 61452
diff changeset
915 * we can run the registered handlers with no signals blocked.
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diff changeset
916 *
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917 * NOTE: with this approach we can have a situation where is_tripped is
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
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parents: 61452
diff changeset
918 * 1 but we have no more signals to handle (Handlers[i].tripped
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
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parents: 61452
diff changeset
919 * is 0 for every signal i). This won't do us any harm (except
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
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parents: 61452
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920 * we're gonna spent some cycles for nothing). This happens when
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
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diff changeset
921 * we receive a signal i after we zero is_tripped and before we
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diff changeset
922 * check Handlers[i].tripped.
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diff changeset
923 */
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diff changeset
924 is_tripped = 0;
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Christian Heimes <christian@cheimes.de>
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diff changeset
925
61467
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diff changeset
926 if (!(f = (PyObject *)PyEval_GetFrame()))
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Antoine Pitrou <solipsis@pitrou.net>
parents: 61452
diff changeset
927 f = Py_None;
44268
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Christian Heimes <christian@cheimes.de>
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diff changeset
928
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929 for (i = 1; i < NSIG; i++) {
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parents: 61452
diff changeset
930 if (Handlers[i].tripped) {
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diff changeset
931 PyObject *result = NULL;
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parents: 61452
diff changeset
932 PyObject *arglist = Py_BuildValue("(iO)", i, f);
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parents: 61452
diff changeset
933 Handlers[i].tripped = 0;
4863
b1707bcdc265 Several changes:
Barry Warsaw <barry@python.org>
parents: 4736
diff changeset
934
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diff changeset
935 if (arglist) {
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diff changeset
936 result = PyEval_CallObject(Handlers[i].func,
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diff changeset
937 arglist);
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diff changeset
938 Py_DECREF(arglist);
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diff changeset
939 }
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diff changeset
940 if (!result)
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941 return -1;
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Barry Warsaw <barry@python.org>
parents: 4736
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942
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943 Py_DECREF(result);
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944 }
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945 }
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Christian Heimes <christian@cheimes.de>
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946
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947 return 0;
1630
0202a72d994e New experimental modules -- signal and sybase
Guido van Rossum <guido@python.org>
parents:
diff changeset
948 }
0202a72d994e New experimental modules -- signal and sybase
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parents:
diff changeset
949
14638
2e170c2f61e1 Use typedef PyOS_sighandler_t and APIs PyOS_getsig() and
Guido van Rossum <guido@python.org>
parents: 14375
diff changeset
950
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Barry Warsaw <barry@python.org>
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951 /* Replacements for intrcheck.c functionality
b1707bcdc265 Several changes:
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952 * Declared in pyerrors.h
b1707bcdc265 Several changes:
Barry Warsaw <barry@python.org>
parents: 4736
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953 */
b1707bcdc265 Several changes:
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parents: 4736
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954 void
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Thomas Wouters <thomas@python.org>
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955 PyErr_SetInterrupt(void)
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Barry Warsaw <barry@python.org>
parents: 4736
diff changeset
956 {
69423
319f7af9ee5e Issue #11768: The signal handler of the signal module only calls
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parents: 65985
diff changeset
957 trip_signal(SIGINT);
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958 }
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parents:
diff changeset
959
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parents:
diff changeset
960 void
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parents: 13500
diff changeset
961 PyOS_InitInterrupts(void)
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parents:
diff changeset
962 {
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963 PyObject *m = PyInit_signal();
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964 if (m) {
65418
fd5135cbd928 _PyImport_FixupExtension() and _PyImport_FindExtension() uses FS encoding
Victor Stinner <victor.stinner@haypocalc.com>
parents: 65039
diff changeset
965 _PyImport_FixupBuiltin(m, "signal");
61467
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966 Py_DECREF(m);
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967 }
5923
3e158e69ac5d Add finialization routines; fixed some memory leaks related to this.
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parents: 5730
diff changeset
968 }
3e158e69ac5d Add finialization routines; fixed some memory leaks related to this.
Guido van Rossum <guido@python.org>
parents: 5730
diff changeset
969
3e158e69ac5d Add finialization routines; fixed some memory leaks related to this.
Guido van Rossum <guido@python.org>
parents: 5730
diff changeset
970 void
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Thomas Wouters <thomas@python.org>
parents: 13500
diff changeset
971 PyOS_FiniInterrupts(void)
5923
3e158e69ac5d Add finialization routines; fixed some memory leaks related to this.
Guido van Rossum <guido@python.org>
parents: 5730
diff changeset
972 {
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diff changeset
973 finisignal();
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Guido van Rossum <guido@python.org>
parents:
diff changeset
974 }
0202a72d994e New experimental modules -- signal and sybase
Guido van Rossum <guido@python.org>
parents:
diff changeset
975
0202a72d994e New experimental modules -- signal and sybase
Guido van Rossum <guido@python.org>
parents:
diff changeset
976 int
13651
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Thomas Wouters <thomas@python.org>
parents: 13500
diff changeset
977 PyOS_InterruptOccurred(void)
1630
0202a72d994e New experimental modules -- signal and sybase
Guido van Rossum <guido@python.org>
parents:
diff changeset
978 {
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979 if (Handlers[SIGINT].tripped) {
1678
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Guido van Rossum <guido@python.org>
parents: 1658
diff changeset
980 #ifdef WITH_THREAD
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981 if (PyThread_get_thread_ident() != main_thread)
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diff changeset
982 return 0;
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Guido van Rossum <guido@python.org>
parents: 1658
diff changeset
983 #endif
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984 Handlers[SIGINT].tripped = 0;
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
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diff changeset
985 return 1;
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diff changeset
986 }
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987 return 0;
1630
0202a72d994e New experimental modules -- signal and sybase
Guido van Rossum <guido@python.org>
parents:
diff changeset
988 }
6578
01ee5607bb35 This fix (across 4 files in 3 directories) solves a subtle problem with
Guido van Rossum <guido@python.org>
parents: 6546
diff changeset
989
01ee5607bb35 This fix (across 4 files in 3 directories) solves a subtle problem with
Guido van Rossum <guido@python.org>
parents: 6546
diff changeset
990 void
13651
8a063423e0b7 Bunch of minor ANSIfications: 'void initfunc()' -> 'void initfunc(void)',
Thomas Wouters <thomas@python.org>
parents: 13500
diff changeset
991 PyOS_AfterFork(void)
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01ee5607bb35 This fix (across 4 files in 3 directories) solves a subtle problem with
Guido van Rossum <guido@python.org>
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diff changeset
992 {
01ee5607bb35 This fix (across 4 files in 3 directories) solves a subtle problem with
Guido van Rossum <guido@python.org>
parents: 6546
diff changeset
993 #ifdef WITH_THREAD
74730
7b24dd587a7b Issue #13817: After fork(), reinit the ad-hoc TLS implementation earlier to fix
Charles-François Natali <neologix@free.fr>
parents: 70138
diff changeset
994 /* PyThread_ReInitTLS() must be called early, to make sure that the TLS API
7b24dd587a7b Issue #13817: After fork(), reinit the ad-hoc TLS implementation earlier to fix
Charles-François Natali <neologix@free.fr>
parents: 70138
diff changeset
995 * can be called safely. */
7b24dd587a7b Issue #13817: After fork(), reinit the ad-hoc TLS implementation earlier to fix
Charles-François Natali <neologix@free.fr>
parents: 70138
diff changeset
996 PyThread_ReInitTLS();
69637
7b7ad9a88451 Issue #10517: After fork(), reinitialize the TLS used by the PyGILState_*
Antoine Pitrou <solipsis@pitrou.net>
parents: 69424
diff changeset
997 _PyGILState_Reinit();
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998 PyEval_ReInitThreads();
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999 main_thread = PyThread_get_thread_ident();
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1000 main_pid = getpid();
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1001 _PyImport_ReInitLock();
6578
01ee5607bb35 This fix (across 4 files in 3 directories) solves a subtle problem with
Guido van Rossum <guido@python.org>
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diff changeset
1002 #endif
01ee5607bb35 This fix (across 4 files in 3 directories) solves a subtle problem with
Guido van Rossum <guido@python.org>
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1003 }