Mercurial > cpython-lru_cache-weakref

annotate Modules/selectmodule.c @ 13667:a6c7bfdd6777 legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Even more ANSIfication: fix as many function pointers and declarations as possible.
author Thomas Wouters <thomas@python.org>
date Sat, 22 Jul 2000 23:57:55 +0000
parents 99dd1c933161
children 59f8cedcf049
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 #include "myselect.h" /* Also includes mytime.h */
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50 #define SOCKET int
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51 #endif
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52 #endif
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53
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54 static PyObject *SelectError;
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55
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56 /* list of Python objects and their file descriptor */
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57 typedef struct {
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58 PyObject *obj; /* owned reference */
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59 SOCKET fd;
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60 int sentinel; /* -1 == sentinel */
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61 } pylist;
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62
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63 static void
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64 reap_obj(pylist fd2obj[FD_SETSIZE + 3])
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65 {
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66 int i;
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67 for (i = 0; i < FD_SETSIZE + 3 && fd2obj[i].sentinel >= 0; i++) {
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68 Py_XDECREF(fd2obj[i].obj);
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69 fd2obj[i].obj = NULL;
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70 }
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71 fd2obj[0].sentinel = -1;
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72 }
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73
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74
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75 /* returns -1 and sets the Python exception if an error occurred, otherwise
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76 returns a number >= 0
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77 */
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78 static int
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79 list2set(PyObject *list, fd_set *set, pylist fd2obj[FD_SETSIZE + 3])
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80 {
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81 int i;
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82 int max = -1;
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83 int index = 0;
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84 int len = PyList_Size(list);
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85 PyObject* o = NULL;
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86
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87 fd2obj[0].obj = (PyObject*)0; /* set list to zero size */
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88 FD_ZERO(set);
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89
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90 for (i = 0; i < len; i++) {
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91 SOCKET v;
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92
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93 /* any intervening fileno() calls could decr this refcnt */
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94 if (!(o = PyList_GetItem(list, i)))
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3db423515626 list2set(): correct return value (an int, not a PyObject*).
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95 return -1;
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96
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97 Py_INCREF(o);
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98 v = PyObject_AsFileDescriptor( o );
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99 if (v == -1) goto finally;
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100
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101 #if defined(_MSC_VER)
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102 max = 0; /* not used for Win32 */
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103 #else /* !_MSC_VER */
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104 if (v < 0 || v >= FD_SETSIZE) {
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105 PyErr_SetString(PyExc_ValueError,
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106 "filedescriptor out of range in select()");
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107 goto finally;
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108 }
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109 if (v > max)
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110 max = v;
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111 #endif /* _MSC_VER */
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112 FD_SET(v, set);
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113
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114 /* add object and its file descriptor to the list */
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115 if (index >= FD_SETSIZE) {
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116 PyErr_SetString(PyExc_ValueError,
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117 "too many file descriptors in select()");
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118 goto finally;
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119 }
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120 fd2obj[index].obj = o;
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121 fd2obj[index].fd = v;
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122 fd2obj[index].sentinel = 0;
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123 fd2obj[++index].sentinel = -1;
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124 }
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125 return max+1;
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126
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127 finally:
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128 Py_XDECREF(o);
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129 return -1;
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130 }
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131
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132 /* returns NULL and sets the Python exception if an error occurred */
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133 static PyObject *
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134 set2list(fd_set *set, pylist fd2obj[FD_SETSIZE + 3])
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135 {
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136 int i, j, count=0;
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137 PyObject *list, *o;
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138 SOCKET fd;
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139
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diff changeset
140 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
141 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
142 count++;
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
143 }
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
144 list = PyList_New(count);
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
145 if (!list)
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
146 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
147
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
148 i = 0;
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
149 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
150 fd = fd2obj[j].fd;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
151 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
152 #ifndef _MSC_VER
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
153 if (fd > FD_SETSIZE) {
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
154 PyErr_SetString(PyExc_SystemError,
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
155 "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
156 goto finally;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
157 }
3675
d617de15774b Yet another pass at fd2obj -- this time for Windows
Guido van Rossum <guido@python.org>
parents: 2611
diff changeset
158 #endif
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
159 o = fd2obj[j].obj;
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
160 fd2obj[j].obj = NULL;
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
161 /* transfer ownership */
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
162 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
163 goto finally;
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
164
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
165 i++;
4692
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 }
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
168 return list;
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
169 finally:
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
170 Py_DECREF(list);
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
171 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
172 }
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
173
902
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
parents:
diff changeset
174
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
175 static PyObject *
13502
7348cceee8fa ANSI-fication
Peter Schneider-Kamp <nowonder@nowonder.de>
parents: 13256
diff changeset
176 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
177 {
8616
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
178 #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
179 /* 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
180 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
181 #else
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
182 pylist rfd2obj[FD_SETSIZE + 3];
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
183 pylist wfd2obj[FD_SETSIZE + 3];
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
184 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
185 #endif
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
186 PyObject *ifdlist, *ofdlist, *efdlist;
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
187 PyObject *ret = NULL;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
188 PyObject *tout = Py_None;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
189 fd_set ifdset, ofdset, efdset;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
190 double timeout;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
191 struct timeval tv, *tvp;
13079
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
192 long seconds;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
193 int imax, omax, emax, max;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
194 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
195
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
196 /* 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
197 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
198 &ifdlist, &ofdlist, &efdlist, &tout))
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
199 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
200
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
201 if (tout == Py_None)
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
202 tvp = (struct timeval *)0;
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
203 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
204 PyErr_SetString(PyExc_TypeError,
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
205 "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
206 return NULL;
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
207 }
1390
cffe8d6b2f09 * selectmodule.c (select_select): timeout argument may be None with same
Guido van Rossum <guido@python.org>
parents: 1284
diff changeset
208 else {
13079
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
209 if (timeout > (double)LONG_MAX) {
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
210 PyErr_SetString(PyExc_OverflowError, "timeout period too long");
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
211 return NULL;
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
212 }
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
213 seconds = (long)timeout;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
214 timeout = timeout - (double)seconds;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
215 tv.tv_sec = seconds;
13079
185003d09e76 Trent Mick:
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
216 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
217 tvp = &tv;
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
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
220 /* sanity check first three arguments */
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
221 if (!PyList_Check(ifdlist) ||
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
222 !PyList_Check(ofdlist) ||
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
223 !PyList_Check(efdlist))
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
224 {
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
225 PyErr_SetString(PyExc_TypeError,
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
226 "arguments 1-3 must be lists");
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
227 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
228 }
902
a4793ae26682 Changes for new UNIX-specific built-in module 'select' and new header for
Guido van Rossum <guido@python.org>
parents:
diff changeset
229
8616
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
230 #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
231 /* 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
232 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
233 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
234 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
235 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
236 if (rfd2obj) PyMem_DEL(rfd2obj);
1c7c2dd1beb1 Vladimir Marangozov's long-awaited malloc restructuring.
Guido van Rossum <guido@python.org>
parents: 11882
diff changeset
237 if (wfd2obj) PyMem_DEL(wfd2obj);
1c7c2dd1beb1 Vladimir Marangozov's long-awaited malloc restructuring.
Guido van Rossum <guido@python.org>
parents: 11882
diff changeset
238 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
239 return NULL;
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
240 }
2417f17fa3e5 On Windows, put the select file descriptor arrays on the heap.
Guido van Rossum <guido@python.org>
parents: 8570
diff changeset
241 #endif
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
242 /* 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
243 * propagates the Python exception set in list2set()
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
244 */
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
245 rfd2obj[0].sentinel = -1;
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
246 wfd2obj[0].sentinel = -1;
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
247 efd2obj[0].sentinel = -1;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
248 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
249 goto finally;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
250 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
251 goto finally;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
252 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
253 goto finally;
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
254 max = imax;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
255 if (omax > max) max = omax;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
256 if (emax > max) max = emax;
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
257
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
258 Py_BEGIN_ALLOW_THREADS
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
259 n = select(max, &ifdset, &ofdset, &efdset, tvp);
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
260 Py_END_ALLOW_THREADS
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
261
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
262 if (n < 0) {
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
263 PyErr_SetFromErrno(SelectError);
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
264 }
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
265 else if (n == 0) {
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
266 /* optimization */
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
267 ifdlist = PyList_New(0);
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
268 if (ifdlist) {
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
269 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
270 Py_DECREF(ifdlist);
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
271 }
4692
cb405b9696d4 Several changes... Guido *please* take a look!
Barry Warsaw <barry@python.org>
parents: 4621
diff changeset
272 }
4700
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
273 else {
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
274 /* 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
275 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
276 is that acceptable?
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
277 */
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
278 ifdlist = set2list(&ifdset, rfd2obj);
825038d98ab6 Reworked to eliminate all potential memory problems, including
Barry Warsaw <barry@python.org>
parents: 4692
diff changeset
279 ofdlist = set2list(&ofdset, wfd2obj);
825038d98ab6 Reworked to eliminate all potential memory problems, including
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280 efdlist = set2list(&efdset, efd2obj);
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281 if (PyErr_Occurred())
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282 ret = NULL;
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283 else
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284 ret = Py_BuildValue("OOO", ifdlist, ofdlist, efdlist);
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285
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286 Py_DECREF(ifdlist);
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287 Py_DECREF(ofdlist);
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288 Py_DECREF(efdlist);
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289 }
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290
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291 finally:
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292 reap_obj(rfd2obj);
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293 reap_obj(wfd2obj);
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294 reap_obj(efd2obj);
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295 #ifdef MS_WINDOWS
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296 PyMem_DEL(rfd2obj);
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297 PyMem_DEL(wfd2obj);
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298 PyMem_DEL(efd2obj);
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299 #endif
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300 return ret;
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301 }
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302
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303 static char select_doc[] =
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304 "select(rlist, wlist, xlist[, timeout]) -> (rlist, wlist, xlist)\n\
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305 \n\
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306 Wait until one or more file descriptors are ready for some kind of I/O.\n\
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307 The first three arguments are lists of file descriptors to be waited for:\n\
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308 rlist -- wait until ready for reading\n\
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309 wlist -- wait until ready for writing\n\
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310 xlist -- wait for an ``exceptional condition''\n\
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311 If only one kind of condition is required, pass [] for the other lists.\n\
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312 A file descriptor is either a socket or file object, or a small integer\n\
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313 gotten from a fileno() method call on one of those.\n\
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314 \n\
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315 The optional 4th argument specifies a timeout in seconds; it may be\n\
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316 a floating point number to specify fractions of seconds. If it is absent\n\
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317 or None, the call will never time out.\n\
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318 \n\
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319 The return value is a tuple of three lists corresponding to the first three\n\
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320 arguments; each contains the subset of the corresponding file descriptors\n\
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321 that are ready.\n\
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322 \n\
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323 *** IMPORTANT NOTICE ***\n\
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324 On Windows, only sockets are supported; on Unix, all file descriptors.";
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325
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326
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327 static PyMethodDef select_methods[] = {
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328 {"select", select_select, 1, select_doc},
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329 {0, 0}, /* sentinel */
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330 };
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331
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332 static char module_doc[] =
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333 "This module supports asynchronous I/O on multiple file descriptors.\n\
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334 \n\
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335 *** IMPORTANT NOTICE ***\n\
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336 On Windows, only sockets are supported; on Unix, all file descriptors.";
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337
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338 DL_EXPORT(void)
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339 initselect(void)
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340 {
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341 PyObject *m, *d;
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342 m = Py_InitModule3("select", select_methods, module_doc);
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343 d = PyModule_GetDict(m);
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344 SelectError = PyErr_NewException("select.error", NULL, NULL);
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345 PyDict_SetItemString(d, "error", SelectError);
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346 }