Mercurial > cpython-lru_cache-weakref

annotate Modules/selectmodule.c @ 13778:f6e4a9dd67cd legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Rename the "parser" package to "parsers" to be compatible with the PyXML project.
author Fred Drake <fdrake@acm.org>
date Mon, 31 Jul 2000 23:59:54 +0000
parents 59f8cedcf049
children 35b7989ba20c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /***********************************************************
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2 Copyright (c) 2000, BeOpen.com.
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3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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5 All rights reserved.
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6
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7 See the file "Misc/COPYRIGHT" for information on usage and
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8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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9 ******************************************************************/
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10
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11 /* select - Module containing unix select(2) call.
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12 Under Unix, the file descriptors are small integers.
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13 Under Win32, select only exists for sockets, and sockets may
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14 have any value except INVALID_SOCKET.
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15 Under BeOS, we suffer the same dichotomy as Win32; sockets can be anything
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16 >= 0.
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17 */
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18
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19 #include "Python.h"
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20
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21 #ifdef HAVE_UNISTD_H
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22 #include <unistd.h>
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23 #endif
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24 #ifdef HAVE_LIMITS_H
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25 #include <limits.h>
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26 #endif
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27
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28 #ifdef __sgi
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29 /* This is missing from unistd.h */
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30 extern void bzero(void *, int);
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31 #endif
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32
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33 #ifndef DONT_HAVE_SYS_TYPES_H
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34 #include <sys/types.h>
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35 #endif
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36
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37 #if defined(PYOS_OS2)
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38 #include <sys/time.h>
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39 #include <utils.h>
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40 #endif
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41
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42 #ifdef MS_WINDOWS
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43 #include <winsock.h>
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44 #else
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45 #ifdef __BEOS__
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46 #include <net/socket.h>
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47 #define SOCKET int
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48 #else
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49 #define SOCKET int
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50 #endif
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51 #endif
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52
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53 static PyObject *SelectError;
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54
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55 /* list of Python objects and their file descriptor */
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56 typedef struct {
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57 PyObject *obj; /* owned reference */
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58 SOCKET fd;
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59 int sentinel; /* -1 == sentinel */
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60 } pylist;
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61
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62 static void
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63 reap_obj(pylist fd2obj[FD_SETSIZE + 3])
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64 {
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65 int i;
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66 for (i = 0; i < FD_SETSIZE + 3 && fd2obj[i].sentinel >= 0; i++) {
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67 Py_XDECREF(fd2obj[i].obj);
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68 fd2obj[i].obj = NULL;
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69 }
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70 fd2obj[0].sentinel = -1;
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71 }
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72
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73
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74 /* returns -1 and sets the Python exception if an error occurred, otherwise
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75 returns a number >= 0
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76 */
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77 static int
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78 list2set(PyObject *list, fd_set *set, pylist fd2obj[FD_SETSIZE + 3])
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79 {
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80 int i;
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81 int max = -1;
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82 int index = 0;
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83 int len = PyList_Size(list);
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84 PyObject* o = NULL;
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85
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86 fd2obj[0].obj = (PyObject*)0; /* set list to zero size */
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87 FD_ZERO(set);
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88
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89 for (i = 0; i < len; i++) {
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90 SOCKET v;
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91
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92 /* any intervening fileno() calls could decr this refcnt */
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93 if (!(o = PyList_GetItem(list, i)))
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94 return -1;
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95
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96 Py_INCREF(o);
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97 v = PyObject_AsFileDescriptor( o );
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98 if (v == -1) goto finally;
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99
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100 #if defined(_MSC_VER)
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101 max = 0; /* not used for Win32 */
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102 #else /* !_MSC_VER */
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103 if (v < 0 || v >= FD_SETSIZE) {
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104 PyErr_SetString(PyExc_ValueError,
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105 "filedescriptor out of range in select()");
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106 goto finally;
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107 }
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108 if (v > max)
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109 max = v;
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110 #endif /* _MSC_VER */
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111 FD_SET(v, set);
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112
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113 /* add object and its file descriptor to the list */
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114 if (index >= FD_SETSIZE) {
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115 PyErr_SetString(PyExc_ValueError,
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116 "too many file descriptors in select()");
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117 goto finally;
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118 }
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119 fd2obj[index].obj = o;
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120 fd2obj[index].fd = v;
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121 fd2obj[index].sentinel = 0;
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122 fd2obj[++index].sentinel = -1;
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123 }
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124 return max+1;
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125
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126 finally:
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127 Py_XDECREF(o);
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128 return -1;
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129 }
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130
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131 /* returns NULL and sets the Python exception if an error occurred */
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132 static PyObject *
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133 set2list(fd_set *set, pylist fd2obj[FD_SETSIZE + 3])
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134 {
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135 int i, j, count=0;
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136 PyObject *list, *o;
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137 SOCKET fd;
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138
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139 for (j = 0; fd2obj[j].sentinel >= 0; j++) {
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Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
140 if (FD_ISSET(fd2obj[j].fd, set))
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
141 count++;
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
142 }
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
143 list = PyList_New(count);
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
144 if (!list)
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
145 return NULL;
902
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
parents:
diff changeset
146
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
147 i = 0;
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
148 for (j = 0; fd2obj[j].sentinel >= 0; j++) {
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
149 fd = fd2obj[j].fd;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
150 if (FD_ISSET(fd, set)) {
3675
d617de15774b Yet another pass at fd2obj -- this time for Windows
Guido van Rossum <guido@python.org>
parents: 2611
diff changeset
151 #ifndef _MSC_VER
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
152 if (fd > FD_SETSIZE) {
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
153 PyErr_SetString(PyExc_SystemError,
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
154 "filedescriptor out of range returned in select()");
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
155 goto finally;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
156 }
3675
d617de15774b Yet another pass at fd2obj -- this time for Windows
Guido van Rossum <guido@python.org>
parents: 2611
diff changeset
157 #endif
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
158 o = fd2obj[j].obj;
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
159 fd2obj[j].obj = NULL;
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
160 /* transfer ownership */
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
161 if (PyList_SetItem(list, i, o) < 0)
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
162 goto finally;
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
163
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
164 i++;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
165 }
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
166 }
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
167 return list;
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
168 finally:
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
169 Py_DECREF(list);
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
170 return NULL;
902
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
parents:
diff changeset
171 }
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
172
902
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
parents:
diff changeset
173
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
174 static PyObject *
13502
7348cceee8fa ANSI-fication
Peter Schneider-Kamp <nowonder@nowonder.de>
parents: 13256
diff changeset
175 select_select(PyObject *self, PyObject *args)
902
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
parents:
diff changeset
176 {
8616
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
177 #ifdef MS_WINDOWS
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
178 /* This would be an awful lot of stack space on Windows! */
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
179 pylist *rfd2obj, *wfd2obj, *efd2obj;
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
180 #else
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
181 pylist rfd2obj[FD_SETSIZE + 3];
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
182 pylist wfd2obj[FD_SETSIZE + 3];
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
183 pylist efd2obj[FD_SETSIZE + 3];
8616
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
184 #endif
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
185 PyObject *ifdlist, *ofdlist, *efdlist;
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
186 PyObject *ret = NULL;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
187 PyObject *tout = Py_None;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
188 fd_set ifdset, ofdset, efdset;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
189 double timeout;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
190 struct timeval tv, *tvp;
13079
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
191 long seconds;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
192 int imax, omax, emax, max;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
193 int n;
902
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
parents:
diff changeset
194
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
195 /* convert arguments */
11882
dc65c5f6ad7c Massive patch by Skip Montanaro to add ":name" to as many
Guido van Rossum <guido@python.org>
parents: 11656
diff changeset
196 if (!PyArg_ParseTuple(args, "OOO|O:select",
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
197 &ifdlist, &ofdlist, &efdlist, &tout))
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
198 return NULL;
902
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
parents:
diff changeset
199
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
200 if (tout == Py_None)
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
201 tvp = (struct timeval *)0;
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
202 else if (!PyArg_Parse(tout, "d", &timeout)) {
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
203 PyErr_SetString(PyExc_TypeError,
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
204 "timeout must be a float or None");
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
205 return NULL;
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
206 }
1390
cffe8d6b2f09 * selectmodule.c (select_select): timeout argument may be None with same
Guido van Rossum <guido@python.org>
parents: 1284
diff changeset
207 else {
13079
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
208 if (timeout > (double)LONG_MAX) {
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
209 PyErr_SetString(PyExc_OverflowError, "timeout period too long");
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
210 return NULL;
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
211 }
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
212 seconds = (long)timeout;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
213 timeout = timeout - (double)seconds;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
214 tv.tv_sec = seconds;
13079
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
215 tv.tv_usec = (long)(timeout*1000000.0);
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
216 tvp = &tv;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
217 }
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
218
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
219 /* sanity check first three arguments */
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
220 if (!PyList_Check(ifdlist) ||
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
221 !PyList_Check(ofdlist) ||
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
222 !PyList_Check(efdlist))
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
223 {
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
224 PyErr_SetString(PyExc_TypeError,
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
225 "arguments 1-3 must be lists");
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
226 return NULL;
1390
cffe8d6b2f09 * selectmodule.c (select_select): timeout argument may be None with same
Guido van Rossum <guido@python.org>
parents: 1284
diff changeset
227 }
902
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
parents:
diff changeset
228
8616
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
229 #ifdef MS_WINDOWS
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
230 /* Allocate memory for the lists */
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
231 rfd2obj = PyMem_NEW(pylist, FD_SETSIZE + 3);
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
232 wfd2obj = PyMem_NEW(pylist, FD_SETSIZE + 3);
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
233 efd2obj = PyMem_NEW(pylist, FD_SETSIZE + 3);
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
234 if (rfd2obj == NULL || wfd2obj == NULL || efd2obj == NULL) {
12576
1c7c2dd1beb1 Vladimir Marangozov's long-awaited malloc restructuring.
Guido van Rossum <guido@python.org>
parents: 11882
diff changeset
235 if (rfd2obj) PyMem_DEL(rfd2obj);
1c7c2dd1beb1 Vladimir Marangozov's long-awaited malloc restructuring.
Guido van Rossum <guido@python.org>
parents: 11882
diff changeset
236 if (wfd2obj) PyMem_DEL(wfd2obj);
1c7c2dd1beb1 Vladimir Marangozov's long-awaited malloc restructuring.
Guido van Rossum <guido@python.org>
parents: 11882
diff changeset
237 if (efd2obj) PyMem_DEL(efd2obj);
8616
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
238 return NULL;
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
239 }
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
240 #endif
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
241 /* Convert lists to fd_sets, and get maximum fd number
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
242 * propagates the Python exception set in list2set()
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
243 */
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
244 rfd2obj[0].sentinel = -1;
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
245 wfd2obj[0].sentinel = -1;
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
246 efd2obj[0].sentinel = -1;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
247 if ((imax=list2set(ifdlist, &ifdset, rfd2obj)) < 0)
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
248 goto finally;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
249 if ((omax=list2set(ofdlist, &ofdset, wfd2obj)) < 0)
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
250 goto finally;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
251 if ((emax=list2set(efdlist, &efdset, efd2obj)) < 0)
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
252 goto finally;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
253 max = imax;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
254 if (omax > max) max = omax;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
255 if (emax > max) max = emax;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
256
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
257 Py_BEGIN_ALLOW_THREADS
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
258 n = select(max, &ifdset, &ofdset, &efdset, tvp);
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
259 Py_END_ALLOW_THREADS
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
260
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
261 if (n < 0) {
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
262 PyErr_SetFromErrno(SelectError);
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
263 }
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
264 else if (n == 0) {
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
265 /* optimization */
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
266 ifdlist = PyList_New(0);
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
267 if (ifdlist) {
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
268 ret = Py_BuildValue("OOO", ifdlist, ifdlist, ifdlist);
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
269 Py_DECREF(ifdlist);
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
270 }
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
271 }
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
272 else {
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
273 /* any of these three calls can raise an exception. it's more
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
274 convenient to test for this after all three calls... but
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
275 is that acceptable?
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
276 */
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
277 ifdlist = set2list(&ifdset, rfd2obj);
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
278 ofdlist = set2list(&ofdset, wfd2obj);
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
279 efdlist = set2list(&efdset, efd2obj);
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280 if (PyErr_Occurred())
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281 ret = NULL;
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282 else
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283 ret = Py_BuildValue("OOO", ifdlist, ofdlist, efdlist);
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284
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285 Py_DECREF(ifdlist);
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286 Py_DECREF(ofdlist);
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287 Py_DECREF(efdlist);
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288 }
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289
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290 finally:
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291 reap_obj(rfd2obj);
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292 reap_obj(wfd2obj);
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293 reap_obj(efd2obj);
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294 #ifdef MS_WINDOWS
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295 PyMem_DEL(rfd2obj);
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296 PyMem_DEL(wfd2obj);
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297 PyMem_DEL(efd2obj);
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298 #endif
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299 return ret;
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300 }
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301
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302 static char select_doc[] =
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303 "select(rlist, wlist, xlist[, timeout]) -> (rlist, wlist, xlist)\n\
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304 \n\
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305 Wait until one or more file descriptors are ready for some kind of I/O.\n\
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306 The first three arguments are lists of file descriptors to be waited for:\n\
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307 rlist -- wait until ready for reading\n\
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308 wlist -- wait until ready for writing\n\
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309 xlist -- wait for an ``exceptional condition''\n\
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310 If only one kind of condition is required, pass [] for the other lists.\n\
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311 A file descriptor is either a socket or file object, or a small integer\n\
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312 gotten from a fileno() method call on one of those.\n\
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313 \n\
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314 The optional 4th argument specifies a timeout in seconds; it may be\n\
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315 a floating point number to specify fractions of seconds. If it is absent\n\
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316 or None, the call will never time out.\n\
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317 \n\
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318 The return value is a tuple of three lists corresponding to the first three\n\
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319 arguments; each contains the subset of the corresponding file descriptors\n\
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320 that are ready.\n\
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321 \n\
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322 *** IMPORTANT NOTICE ***\n\
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323 On Windows, only sockets are supported; on Unix, all file descriptors.";
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324
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325
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326 static PyMethodDef select_methods[] = {
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327 {"select", select_select, 1, select_doc},
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328 {0, 0}, /* sentinel */
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329 };
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330
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331 static char module_doc[] =
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332 "This module supports asynchronous I/O on multiple file descriptors.\n\
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333 \n\
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334 *** IMPORTANT NOTICE ***\n\
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335 On Windows, only sockets are supported; on Unix, all file descriptors.";
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336
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337 DL_EXPORT(void)
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338 initselect(void)
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339 {
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340 PyObject *m, *d;
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341 m = Py_InitModule3("select", select_methods, module_doc);
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342 d = PyModule_GetDict(m);
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343 SelectError = PyErr_NewException("select.error", NULL, NULL);
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344 PyDict_SetItemString(d, "error", SelectError);
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345 }