Mercurial > cpython-lru_cache-weakref

annotate Modules/selectmodule.c @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 65d2d8e67da3
children d36250aefb82
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1 /***********************************************************
2061
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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 /* select - Module containing unix select(2) call.
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33 Under Unix, the file descriptors are small integers.
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34 Under Win32, select only exists for sockets, and sockets may
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35 have any value except INVALID_SOCKET.
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36 */
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37
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38 #include "allobjects.h"
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39 #include "modsupport.h"
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40 #include "ceval.h"
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41
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42 #include <sys/types.h>
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43
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44 #ifdef MS_WINDOWS
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45 #include <winsock.h>
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46 #else
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47 #include "myselect.h" /* Also includes mytime.h */
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48 #define SOCKET int
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49 #endif
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50
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51 static object *SelectError;
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52
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53 typedef struct { /* list of Python objects and their file descriptor */
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54 object *obj;
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55 SOCKET fd;
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56 } pylist;
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57
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58 static int
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59 list2set(list, set, fd2obj)
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60 object *list;
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61 fd_set *set;
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62 pylist fd2obj[FD_SETSIZE + 3];
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63 {
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64 int i, len, index, max = -1;
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65 object *o, *filenomethod, *fno;
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66 SOCKET v;
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67
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68 index = 0;
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69 fd2obj[0].obj = (object*)0; /* set list to zero size */
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70
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71 FD_ZERO(set);
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72 len = getlistsize(list);
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73 for( i=0; i<len; i++ ) {
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74 o = getlistitem(list, i);
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75 if ( is_intobject(o) ) {
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76 v = getintvalue(o);
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77 } else if ( (filenomethod = getattr(o, "fileno")) != NULL ) {
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78 fno = call_object(filenomethod, NULL);
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79 DECREF(filenomethod);
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80 if ( fno == NULL )
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81 return -1;
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82 if ( !is_intobject(fno) ) {
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83 err_badarg();
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84 DECREF(fno);
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85 return -1;
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86 }
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87 v = getintvalue(fno);
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88 DECREF(fno);
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89 } else {
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90 err_badarg();
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91 return -1;
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92 }
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93 #ifdef _MSC_VER
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94 max = 0; /* not used for Win32 */
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95 #else
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96 if ( v < 0 || v >= FD_SETSIZE ) {
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97 err_setstr(ValueError, "filedescriptor out of range in select()");
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98 return -1;
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99 }
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100 if ( v > max ) max = v;
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101 #endif
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102 FD_SET(v, set);
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103 /* add object and its file descriptor to the list */
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104 if ( index >= FD_SETSIZE ) {
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105 err_setstr(ValueError, "too many file descriptors in select()");
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106 return -1;
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107 }
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108 fd2obj[index].obj = o;
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109 fd2obj[index].fd = v;
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110 fd2obj[++index].obj = (object *)0; /* sentinel */
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111 }
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112 return max+1;
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113 }
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114
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115 static object *
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116 set2list(set, fd2obj)
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117 fd_set *set;
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118 pylist fd2obj[FD_SETSIZE + 3];
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119 {
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120 int j, num=0;
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121 object *list, *o;
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122 SOCKET fd;
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123
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124 for(j=0; fd2obj[j].obj; j++)
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125 if ( FD_ISSET(fd2obj[j].fd, set) )
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126 num++;
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127 list = newlistobject(num);
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128 num = 0;
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129 for(j=0; fd2obj[j].obj; j++) {
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130 fd = fd2obj[j].fd;
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131 if ( FD_ISSET(fd, set) ) {
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132 #ifndef _MSC_VER
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133 if ( fd > FD_SETSIZE ) {
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134 err_setstr(SystemError,
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135 "filedescriptor out of range returned in select()");
902
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136 return NULL;
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137 }
3675
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Guido van Rossum <guido@python.org>
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138 #endif
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139 o = fd2obj[j].obj;
902
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140 INCREF(o);
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141 setlistitem(list, num, o);
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142 num++;
3675
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143 }
902
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144 }
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145 return list;
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146 }
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147
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148 static object *
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149 select_select(self, args)
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150 object *self;
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151 object *args;
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152 {
3675
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153 pylist rfd2obj[FD_SETSIZE + 3], wfd2obj[FD_SETSIZE + 3], efd2obj[FD_SETSIZE + 3];
902
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154 object *ifdlist, *ofdlist, *efdlist;
1390
cffe8d6b2f09 * selectmodule.c (select_select): timeout argument may be None with same
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155 object *ret, *tout;
902
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156 fd_set ifdset, ofdset, efdset;
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157 double timeout;
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158 struct timeval tv, *tvp;
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159 int seconds;
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160 int imax, omax, emax, max;
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161 int n;
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162
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163
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164 /* Get args. Looks funny because of optional timeout argument */
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165 if ( getargs(args, "(OOOO)", &ifdlist, &ofdlist, &efdlist, &tout) ) {
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Guido van Rossum <guido@python.org>
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166 if (tout == None)
cffe8d6b2f09 * selectmodule.c (select_select): timeout argument may be None with same
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167 tvp = (struct timeval *)0;
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168 else {
1392
0ffff40d13ff Fixed a couple of bugs: getargs doesn't use % escapes, and seconds
Sjoerd Mullender <sjoerd@acm.org>
parents: 1390
diff changeset
169 if (!getargs(tout, "d;timeout must be float or None", &timeout))
1390
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170 return NULL;
1392
0ffff40d13ff Fixed a couple of bugs: getargs doesn't use % escapes, and seconds
Sjoerd Mullender <sjoerd@acm.org>
parents: 1390
diff changeset
171 seconds = (int)timeout;
1390
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172 timeout = timeout - (double)seconds;
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173 tv.tv_sec = seconds;
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174 tv.tv_usec = (int)(timeout*1000000.0);
cffe8d6b2f09 * selectmodule.c (select_select): timeout argument may be None with same
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175 tvp = &tv;
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176 }
902
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177 } else {
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178 /* Doesn't have 4 args, that means no timeout */
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179 err_clear();
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180 if (!getargs(args, "(OOO)", &ifdlist, &ofdlist, &efdlist) )
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181 return 0;
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182 tvp = (struct timeval *)0;
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183 }
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184 if ( !is_listobject(ifdlist) || !is_listobject(ofdlist) ||
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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185 !is_listobject(efdlist) ) {
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186 err_badarg();
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187 return 0;
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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188 }
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189
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190 /* Convert lists to fd_sets, and get maximum fd number */
2611
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Guido van Rossum <guido@python.org>
parents: 2061
diff changeset
191 if( (imax=list2set(ifdlist, &ifdset, rfd2obj)) < 0 )
902
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192 return 0;
2611
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193 if( (omax=list2set(ofdlist, &ofdset, wfd2obj)) < 0 )
902
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194 return 0;
2611
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195 if( (emax=list2set(efdlist, &efdset, efd2obj)) < 0 )
902
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196 return 0;
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197 max = imax;
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198 if ( omax > max ) max = omax;
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199 if ( emax > max ) max = emax;
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200
926
c156d4960c2b * Makefile: cosmetics
Guido van Rossum <guido@python.org>
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diff changeset
201 BGN_SAVE
902
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202 n = select(max, &ifdset, &ofdset, &efdset, tvp);
926
c156d4960c2b * Makefile: cosmetics
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diff changeset
203 END_SAVE
902
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204
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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205 if ( n < 0 ) {
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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206 err_errno(SelectError);
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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207 return 0;
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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208 }
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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209
3675
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diff changeset
210 if ( n == 0 ) { /* Speedup hack */
d617de15774b Yet another pass at fd2obj -- this time for Windows
Guido van Rossum <guido@python.org>
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diff changeset
211 ifdlist = newlistobject(0);
d617de15774b Yet another pass at fd2obj -- this time for Windows
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parents: 2611
diff changeset
212 ret = mkvalue("OOO", ifdlist, ifdlist, ifdlist);
d617de15774b Yet another pass at fd2obj -- this time for Windows
Guido van Rossum <guido@python.org>
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213 XDECREF(ifdlist);
d617de15774b Yet another pass at fd2obj -- this time for Windows
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diff changeset
214 return ret;
d617de15774b Yet another pass at fd2obj -- this time for Windows
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parents: 2611
diff changeset
215 }
902
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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diff changeset
216
3675
d617de15774b Yet another pass at fd2obj -- this time for Windows
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parents: 2611
diff changeset
217 ifdlist = set2list(&ifdset, rfd2obj);
d617de15774b Yet another pass at fd2obj -- this time for Windows
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parents: 2611
diff changeset
218 ofdlist = set2list(&ofdset, wfd2obj);
d617de15774b Yet another pass at fd2obj -- this time for Windows
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parents: 2611
diff changeset
219 efdlist = set2list(&efdset, efd2obj);
1207
b564bd4e57e1 * ceval.c: ifdef out the last argument passing compat hack.
Guido van Rossum <guido@python.org>
parents: 927
diff changeset
220 ret = mkvalue("OOO", ifdlist, ofdlist, efdlist);
b564bd4e57e1 * ceval.c: ifdef out the last argument passing compat hack.
Guido van Rossum <guido@python.org>
parents: 927
diff changeset
221 XDECREF(ifdlist);
b564bd4e57e1 * ceval.c: ifdef out the last argument passing compat hack.
Guido van Rossum <guido@python.org>
parents: 927
diff changeset
222 XDECREF(ofdlist);
b564bd4e57e1 * ceval.c: ifdef out the last argument passing compat hack.
Guido van Rossum <guido@python.org>
parents: 927
diff changeset
223 XDECREF(efdlist);
b564bd4e57e1 * ceval.c: ifdef out the last argument passing compat hack.
Guido van Rossum <guido@python.org>
parents: 927
diff changeset
224 return ret;
902
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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225 }
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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parents:
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226
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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227
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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228 static struct methodlist select_methods[] = {
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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229 { "select", select_select },
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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diff changeset
230 { 0, 0 },
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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parents:
diff changeset
231 };
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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diff changeset
232
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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diff changeset
233
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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diff changeset
234 void
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
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diff changeset
235 initselect()
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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parents:
diff changeset
236 {
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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diff changeset
237 object *m, *d;
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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diff changeset
238 m = initmodule("select", select_methods);
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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diff changeset
239 d = getmoduledict(m);
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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diff changeset
240 SelectError = newstringobject("select.error");
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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parents:
diff changeset
241 if ( SelectError == NULL || dictinsert(d, "error", SelectError) )
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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parents:
diff changeset
242 fatal("Cannot define select.error");
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
parents:
diff changeset
243 }