Mercurial > cpython-lru_cache-weakref

annotate Modules/selectmodule.c @ 1573:eaaba2cafeeb legacy-trunk

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author Guido van Rossum <guido@python.org>
date Mon, 07 Mar 1994 12:05:46 +0000
parents 0ffff40d13ff
children 1940892d2fe3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /***********************************************************
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2 Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
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3 Amsterdam, 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 not be used in advertising or publicity pertaining to
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13 distribution of the software without specific, written prior permission.
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14
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15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 ******************************************************************/
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24
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25 /* select - Module containing unix select(2) call */
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26
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27 #include "allobjects.h"
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28 #include "modsupport.h"
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29 #include "ceval.h"
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30
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7f7ba65a2825 Use "myselect.h" as intended.
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31 #include "myselect.h"
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32
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33 static object *SelectError;
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34
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35 static
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36 list2set(list, set, fd2obj)
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37 object *list;
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38 fd_set *set;
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39 object *fd2obj[FD_SETSIZE];
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40 {
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41 int i, len, v, max = -1;
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42 object *o, *filenomethod, *fno;
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43
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44 FD_ZERO(set);
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45 len = getlistsize(list);
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46 for( i=0; i<len; i++ ) {
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47 o = getlistitem(list, i);
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48 if ( is_intobject(o) ) {
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49 v = getintvalue(o);
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50 } else if ( (filenomethod = getattr(o, "fileno")) != NULL ) {
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51 fno = call_object(filenomethod, NULL);
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52 DECREF(filenomethod);
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53 if ( fno == NULL )
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54 return -1;
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55 if ( !is_intobject(fno) ) {
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56 err_badarg();
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57 DECREF(fno);
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58 return -1;
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59 }
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60 v = getintvalue(fno);
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61 DECREF(fno);
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62 } else {
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63 err_badarg();
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64 return -1;
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65 }
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66 if ( v >= FD_SETSIZE ) {
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67 err_setstr(SystemError, "FD_SETSIZE too low in select()");
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68 return -1;
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69 }
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70 if ( v > max ) max = v;
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71 FD_SET(v, set);
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72 fd2obj[v] = o;
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73 }
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74 return max+1;
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75 }
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76
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77 static object *
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78 set2list(set, max, fd2obj)
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79 fd_set *set;
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80 int max;
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81 object *fd2obj[FD_SETSIZE];
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82 {
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83 int i, num=0;
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84 object *list, *o;
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85
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86 for(i=0; i<max; i++)
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87 if ( FD_ISSET(i,set) )
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88 num++;
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89 list = newlistobject(num);
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90 num = 0;
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91 for(i=0; i<max; i++)
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92 if ( FD_ISSET(i,set) ) {
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93 if ( i > FD_SETSIZE ) {
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94 err_setstr(SystemError, "FD_SETSIZE too low in select()");
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95 return NULL;
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96 }
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97 o = fd2obj[i];
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98 if ( o == 0 ) {
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99 err_setstr(SystemError,
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100 "Bad filedescriptor returned from select()");
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101 return NULL;
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102 }
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103 INCREF(o);
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104 setlistitem(list, num, o);
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105 num++;
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106 }
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107 return list;
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108 }
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109
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110 static object *
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111 select_select(self, args)
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112 object *self;
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113 object *args;
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114 {
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115 object *fd2obj[FD_SETSIZE];
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116 object *ifdlist, *ofdlist, *efdlist;
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117 object *ret, *tout;
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118 fd_set ifdset, ofdset, efdset;
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119 double timeout;
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120 struct timeval tv, *tvp;
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121 int seconds;
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122 int imax, omax, emax, max;
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123 int n;
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124
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125
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126 /* Get args. Looks funny because of optional timeout argument */
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127 if ( getargs(args, "(OOOO)", &ifdlist, &ofdlist, &efdlist, &tout) ) {
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128 if (tout == None)
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129 tvp = (struct timeval *)0;
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130 else {
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131 if (!getargs(tout, "d;timeout must be float or None", &timeout))
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Guido van Rossum <guido@python.org>
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132 return NULL;
1392
0ffff40d13ff Fixed a couple of bugs: getargs doesn't use % escapes, and seconds
Sjoerd Mullender <sjoerd@acm.org>
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133 seconds = (int)timeout;
1390
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134 timeout = timeout - (double)seconds;
cffe8d6b2f09 * selectmodule.c (select_select): timeout argument may be None with same
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135 tv.tv_sec = seconds;
cffe8d6b2f09 * selectmodule.c (select_select): timeout argument may be None with same
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136 tv.tv_usec = (int)(timeout*1000000.0);
cffe8d6b2f09 * selectmodule.c (select_select): timeout argument may be None with same
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137 tvp = &tv;
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138 }
902
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139 } else {
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140 /* Doesn't have 4 args, that means no timeout */
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141 err_clear();
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142 if (!getargs(args, "(OOO)", &ifdlist, &ofdlist, &efdlist) )
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143 return 0;
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144 tvp = (struct timeval *)0;
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145 }
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146 if ( !is_listobject(ifdlist) || !is_listobject(ofdlist) ||
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147 !is_listobject(efdlist) ) {
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148 err_badarg();
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149 return 0;
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150 }
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151
922
c12b445cdace * myselect.h: bzero -> memset
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152 memset((char *)fd2obj, '\0', sizeof(fd2obj));
902
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153
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154 /* Convert lists to fd_sets, and get maximum fd number */
922
c12b445cdace * myselect.h: bzero -> memset
Guido van Rossum <guido@python.org>
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155 if( (imax=list2set(ifdlist, &ifdset, fd2obj)) < 0 )
902
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156 return 0;
922
c12b445cdace * myselect.h: bzero -> memset
Guido van Rossum <guido@python.org>
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157 if( (omax=list2set(ofdlist, &ofdset, fd2obj)) < 0 )
902
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158 return 0;
922
c12b445cdace * myselect.h: bzero -> memset
Guido van Rossum <guido@python.org>
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159 if( (emax=list2set(efdlist, &efdset, fd2obj)) < 0 )
902
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160 return 0;
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161 max = imax;
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162 if ( omax > max ) max = omax;
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163 if ( emax > max ) max = emax;
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164
926
c156d4960c2b * Makefile: cosmetics
Guido van Rossum <guido@python.org>
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165 BGN_SAVE
902
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166 n = select(max, &ifdset, &ofdset, &efdset, tvp);
926
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Guido van Rossum <guido@python.org>
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167 END_SAVE
902
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168
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169 if ( n < 0 ) {
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170 err_errno(SelectError);
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171 return 0;
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172 }
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173
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
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174 if ( n == 0 )
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175 imax = omax = emax = 0; /* Speedup hack */
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176
922
c12b445cdace * myselect.h: bzero -> memset
Guido van Rossum <guido@python.org>
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177 ifdlist = set2list(&ifdset, imax, fd2obj);
c12b445cdace * myselect.h: bzero -> memset
Guido van Rossum <guido@python.org>
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178 ofdlist = set2list(&ofdset, omax, fd2obj);
c12b445cdace * myselect.h: bzero -> memset
Guido van Rossum <guido@python.org>
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179 efdlist = set2list(&efdset, emax, fd2obj);
1207
b564bd4e57e1 * ceval.c: ifdef out the last argument passing compat hack.
Guido van Rossum <guido@python.org>
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180 ret = mkvalue("OOO", ifdlist, ofdlist, efdlist);
b564bd4e57e1 * ceval.c: ifdef out the last argument passing compat hack.
Guido van Rossum <guido@python.org>
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181 XDECREF(ifdlist);
b564bd4e57e1 * ceval.c: ifdef out the last argument passing compat hack.
Guido van Rossum <guido@python.org>
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182 XDECREF(ofdlist);
b564bd4e57e1 * ceval.c: ifdef out the last argument passing compat hack.
Guido van Rossum <guido@python.org>
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183 XDECREF(efdlist);
b564bd4e57e1 * ceval.c: ifdef out the last argument passing compat hack.
Guido van Rossum <guido@python.org>
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184 return ret;
902
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185 }
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186
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187
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188 static struct methodlist select_methods[] = {
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189 { "select", select_select },
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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190 { 0, 0 },
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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191 };
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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192
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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193
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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194 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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195 initselect()
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
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196 {
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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197 object *m, *d;
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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198 m = initmodule("select", select_methods);
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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199 d = getmoduledict(m);
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
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200 SelectError = newstringobject("select.error");
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
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201 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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202 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>
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203 }