Mercurial > cpython-lru_cache-weakref

annotate Modules/fcntlmodule.c @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 605fba02e195
children f527c12f2e55
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1 /***********************************************************
2061
172ba04a5191 Added 1995 to copyright message.
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* fcntl module */
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33
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34 #include "Python.h"
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35
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36 #ifdef HAVE_UNISTD_H
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37 #include <unistd.h>
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38 #endif
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39
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40 #ifdef HAVE_SYS_FILE_H
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41 #include <sys/file.h>
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42 #endif
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43
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44 #include <sys/ioctl.h>
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45 #include <fcntl.h>
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46
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47
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48 /* fcntl(fd, opt, [arg]) */
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49
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50 static PyObject *
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51 fcntl_fcntl(self, args)
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52 PyObject *self; /* Not used */
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53 PyObject *args;
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54 {
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55 int fd;
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56 int code;
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57 int arg;
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58 int ret;
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59 char *str;
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60 int len;
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61 char buf[1024];
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62
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63 if (PyArg_Parse(args, "(iis#)", &fd, &code, &str, &len)) {
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64 if (len > sizeof buf) {
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65 PyErr_SetString(PyExc_ValueError,
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66 "fcntl string arg too long");
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67 return NULL;
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68 }
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69 memcpy(buf, str, len);
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70 Py_BEGIN_ALLOW_THREADS
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71 ret = fcntl(fd, code, buf);
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72 Py_END_ALLOW_THREADS
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73 if (ret < 0) {
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74 PyErr_SetFromErrno(PyExc_IOError);
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75 return NULL;
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76 }
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77 return PyString_FromStringAndSize(buf, len);
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78 }
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79
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80 PyErr_Clear();
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81 if (PyArg_Parse(args, "(ii)", &fd, &code))
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82 arg = 0;
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83 else {
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84 PyErr_Clear();
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85 if (!PyArg_Parse(args, "(iii)", &fd, &code, &arg))
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86 return NULL;
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87 }
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88 Py_BEGIN_ALLOW_THREADS
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89 ret = fcntl(fd, code, arg);
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90 Py_END_ALLOW_THREADS
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91 if (ret < 0) {
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92 PyErr_SetFromErrno(PyExc_IOError);
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93 return NULL;
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94 }
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95 return PyInt_FromLong((long)ret);
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96 }
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97
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98
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99 /* ioctl(fd, opt, [arg]) */
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100
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101 static PyObject *
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102 fcntl_ioctl(self, args)
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103 PyObject *self; /* Not used */
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104 PyObject *args;
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105 {
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106 int fd;
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107 int code;
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108 int arg;
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109 int ret;
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110 char *str;
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111 int len;
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112 char buf[1024];
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113
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114 if (PyArg_Parse(args, "(iis#)", &fd, &code, &str, &len)) {
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115 if (len > sizeof buf) {
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116 PyErr_SetString(PyExc_ValueError,
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117 "ioctl string arg too long");
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118 return NULL;
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119 }
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120 memcpy(buf, str, len);
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121 Py_BEGIN_ALLOW_THREADS
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122 ret = ioctl(fd, code, buf);
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123 Py_END_ALLOW_THREADS
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124 if (ret < 0) {
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125 PyErr_SetFromErrno(PyExc_IOError);
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126 return NULL;
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127 }
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128 return PyString_FromStringAndSize(buf, len);
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129 }
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130
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131 PyErr_Clear();
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132 if (PyArg_Parse(args, "(ii)", &fd, &code))
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133 arg = 0;
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134 else {
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135 PyErr_Clear();
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136 if (!PyArg_Parse(args, "(iii)", &fd, &code, &arg))
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137 return NULL;
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138 }
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139 Py_BEGIN_ALLOW_THREADS
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140 ret = ioctl(fd, code, arg);
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141 Py_END_ALLOW_THREADS
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142 if (ret < 0) {
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143 PyErr_SetFromErrno(PyExc_IOError);
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144 return NULL;
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145 }
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146 return PyInt_FromLong((long)ret);
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147 }
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148
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149
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150 /* flock(fd, operation) */
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151
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152 static PyObject *
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153 fcntl_flock(self, args)
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154 PyObject *self; /* Not used */
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155 PyObject *args;
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156 {
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157 int fd;
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158 int code;
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159 int ret;
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160
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161 if (!PyArg_Parse(args, "(ii)", &fd, &code))
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162 return NULL;
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163
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164 Py_BEGIN_ALLOW_THREADS
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165 #ifdef HAVE_FLOCK
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166 ret = flock(fd, code);
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167 #else
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168
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169 #ifndef LOCK_SH
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170 #define LOCK_SH 1 /* shared lock */
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171 #define LOCK_EX 2 /* exclusive lock */
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172 #define LOCK_NB 4 /* don't block when locking */
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173 #define LOCK_UN 8 /* unlock */
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174 #endif
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175 {
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176 struct flock l;
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177 if (code == LOCK_UN)
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178 l.l_type = F_UNLCK;
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179 else if (code & LOCK_SH)
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180 l.l_type = F_RDLCK;
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181 else if (code & LOCK_EX)
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182 l.l_type = F_WRLCK;
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183 else {
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184 PyErr_SetString(PyExc_ValueError,
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185 "unrecognized flock argument");
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186 return NULL;
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187 }
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188 l.l_whence = l.l_start = l.l_len = 0;
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189 ret = fcntl(fd, (code & LOCK_NB) ? F_SETLK : F_SETLKW, &l);
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190 }
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191 #endif /* HAVE_FLOCK */
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192 Py_END_ALLOW_THREADS
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193 if (ret < 0) {
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194 PyErr_SetFromErrno(PyExc_IOError);
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195 return NULL;
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196 }
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197 Py_INCREF(Py_None);
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198 return Py_None;
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199 }
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200
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201 /* lockf(fd, operation) */
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202 static PyObject *
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203 fcntl_lockf(self, args)
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204 PyObject *self; /* Not used */
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205 PyObject *args;
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206 {
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207 int fd, code, len = 0, start = 0, whence = 0, ret;
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208
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209 if (!PyArg_ParseTuple(args, "ii|iii", &fd, &code, &len,
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210 &start, &whence))
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211 return NULL;
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212
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213 Py_BEGIN_ALLOW_THREADS
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214 #ifndef LOCK_SH
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215 #define LOCK_SH 1 /* shared lock */
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216 #define LOCK_EX 2 /* exclusive lock */
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217 #define LOCK_NB 4 /* don't block when locking */
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218 #define LOCK_UN 8 /* unlock */
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219 #endif
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220 {
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221 struct flock l;
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222 if (code == LOCK_UN)
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223 l.l_type = F_UNLCK;
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224 else if (code & LOCK_SH)
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225 l.l_type = F_RDLCK;
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226 else if (code & LOCK_EX)
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227 l.l_type = F_WRLCK;
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228 else {
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229 PyErr_SetString(PyExc_ValueError,
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230 "unrecognized flock argument");
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231 return NULL;
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232 }
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233 l.l_len = len;
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234 l.l_start = start;
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235 l.l_whence = whence;
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236 ret = fcntl(fd, (code & LOCK_NB) ? F_SETLK : F_SETLKW, &l);
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237 }
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238 Py_END_ALLOW_THREADS
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239 if (ret < 0) {
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240 PyErr_SetFromErrno(PyExc_IOError);
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241 return NULL;
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242 }
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243 Py_INCREF(Py_None);
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244 return Py_None;
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245 }
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246
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247 /* List of functions */
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248
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249 static PyMethodDef fcntl_methods[] = {
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250 {"fcntl", fcntl_fcntl},
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251 {"ioctl", fcntl_ioctl},
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252 {"flock", fcntl_flock},
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253 {"lockf", fcntl_lockf, 1},
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254 {NULL, NULL} /* sentinel */
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255 };
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256
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257
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258 /* Module initialisation */
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259
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260 void
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261 initfcntl()
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262 {
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263 PyObject *m, *d;
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264
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265 /* Create the module and add the functions */
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266 m = Py_InitModule("fcntl", fcntl_methods);
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267
7d3a053c6765 struct: pack/unpack binary structs; fcntl: fcntl(), ioctl().
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268 /* Add some symbolic constants to the module */
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269 d = PyModule_GetDict(m);
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270
7d3a053c6765 struct: pack/unpack binary structs; fcntl: fcntl(), ioctl().
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271 /* Check for errors */
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272 if (PyErr_Occurred())
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273 Py_FatalError("can't initialize module fcntl");
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274 }