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annotate lib/pipe2.c @ 17907:0a1c2535cad9

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euidaccess: Fix Android build * modules/euidaccess (Depends-on): Add fcntl-h to ensure that AT_EACCESS gets declared.
author Kevin Cernekee <cernekee@google.com>
date Wed, 11 Feb 2015 15:22:54 -0800
parents ab58d4870664
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
11870
ddd29d8cdded New module 'pipe2'.
Bruno Haible <bruno@clisp.org>
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1 /* Create a pipe, with specific opening flags.
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ab58d4870664 version-etc: new year
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parents: 17587
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2 Copyright (C) 2009-2015 Free Software Foundation, Inc.
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3
ddd29d8cdded New module 'pipe2'.
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License along
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bb182ee4a09d maint: replace FSF snail-mail addresses with URLs
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15 with this program; if not, see <http://www.gnu.org/licenses/>. */
11870
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16
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17 #include <config.h>
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18
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19 /* Specification. */
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20 #include <unistd.h>
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21
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22 #include <errno.h>
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23 #include <fcntl.h>
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24
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d8be19310ad9 accept4, dup3, pipe2: port to Cygwin
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25 #include "binary-io.h"
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26 #include "verify.h"
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27
c593fd7d2ab9 pipe2: Remove dependency on 'nonblocking' module.
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28 #if GNULIB_defined_O_NONBLOCK
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29 # include "nonblocking.h"
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30 #endif
11900
ec8584c5c427 dup2, pipe2: fix some recent test failures on cygwin 1.5.x
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31
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32 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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59c686e5b2df Talk about "native Windows API", not "Woe32".
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33 /* Native Windows API. */
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34
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35 # include <io.h>
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36
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37 #endif
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38
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39 int
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40 pipe2 (int fd[2], int flags)
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41 {
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42 /* Mingw _pipe() corrupts fd on failure; also, if we succeed at
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43 creating the pipe but later fail at changing fcntl, we want
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44 to leave fd unchanged: http://austingroupbugs.net/view.php?id=467 */
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5e07722935cf pipe2: fix C89 compile problem
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45 int tmp[2];
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46 tmp[0] = fd[0];
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47 tmp[1] = fd[1];
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48
11893
476cefda5290 Tolerate declared but missing pipe2 syscall.
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49 #if HAVE_PIPE2
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50 # undef pipe2
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51 /* Try the system call first, if it exists. (We may be running with a glibc
476cefda5290 Tolerate declared but missing pipe2 syscall.
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52 that has the function but with an older kernel that lacks it.) */
476cefda5290 Tolerate declared but missing pipe2 syscall.
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53 {
11895
3ef16b8c79cd Avoid running into nonexistent system calls repeatedly.
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54 /* Cache the information whether the system call really exists. */
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55 static int have_pipe2_really; /* 0 = unknown, 1 = yes, -1 = no */
3ef16b8c79cd Avoid running into nonexistent system calls repeatedly.
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56 if (have_pipe2_really >= 0)
3ef16b8c79cd Avoid running into nonexistent system calls repeatedly.
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57 {
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58 int result = pipe2 (fd, flags);
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59 if (!(result < 0 && errno == ENOSYS))
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60 {
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61 have_pipe2_really = 1;
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62 return result;
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63 }
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64 have_pipe2_really = -1;
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65 }
11893
476cefda5290 Tolerate declared but missing pipe2 syscall.
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66 }
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67 #endif
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68
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ddd29d8cdded New module 'pipe2'.
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69 /* Check the supported flags. */
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7ba508565384 pipe2: fix O_NONBLOCK support on mingw
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70 if ((flags & ~(O_CLOEXEC | O_NONBLOCK | O_BINARY | O_TEXT)) != 0)
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71 {
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72 errno = EINVAL;
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73 return -1;
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74 }
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75
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76 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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77 /* Native Windows API. */
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78
14592
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79 if (_pipe (fd, 4096, flags & ~O_NONBLOCK) < 0)
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80 {
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81 fd[0] = tmp[0];
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82 fd[1] = tmp[1];
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83 return -1;
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84 }
14592
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85
14856
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86 /* O_NONBLOCK handling.
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87 On native Windows platforms, O_NONBLOCK is defined by gnulib. Use the
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88 functions defined by the gnulib module 'nonblocking'. */
c593fd7d2ab9 pipe2: Remove dependency on 'nonblocking' module.
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89 # if GNULIB_defined_O_NONBLOCK
14535
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90 if (flags & O_NONBLOCK)
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91 {
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92 if (set_nonblocking_flag (fd[0], true) != 0
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93 || set_nonblocking_flag (fd[1], true) != 0)
14592
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94 goto fail;
14535
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95 }
14856
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96 # else
15754
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97 {
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98 verify (O_NONBLOCK == 0);
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99 }
14856
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100 # endif
14592
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101
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102 return 0;
11870
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103
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104 #else
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105 /* Unix API. */
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106
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107 if (pipe (fd) < 0)
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108 return -1;
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109
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110 /* POSIX <http://www.opengroup.org/onlinepubs/9699919799/functions/pipe.html>
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111 says that initially, the O_NONBLOCK and FD_CLOEXEC flags are cleared on
14535
7ba508565384 pipe2: fix O_NONBLOCK support on mingw
Eric Blake <eblake@redhat.com>
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112 both fd[0] and fd[1]. */
11870
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113
14856
c593fd7d2ab9 pipe2: Remove dependency on 'nonblocking' module.
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114 /* O_NONBLOCK handling.
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115 On Unix platforms, O_NONBLOCK is defined by the system. Use fcntl(). */
11870
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116 if (flags & O_NONBLOCK)
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117 {
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118 int fcntl_flags;
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119
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120 if ((fcntl_flags = fcntl (fd[1], F_GETFL, 0)) < 0
12421
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121 || fcntl (fd[1], F_SETFL, fcntl_flags | O_NONBLOCK) == -1
e8d2c6fc33ad Use spaces for indentation, not tabs.
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122 || (fcntl_flags = fcntl (fd[0], F_GETFL, 0)) < 0
e8d2c6fc33ad Use spaces for indentation, not tabs.
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123 || fcntl (fd[0], F_SETFL, fcntl_flags | O_NONBLOCK) == -1)
e8d2c6fc33ad Use spaces for indentation, not tabs.
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124 goto fail;
11870
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125 }
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126
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127 if (flags & O_CLOEXEC)
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128 {
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129 int fcntl_flags;
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130
ddd29d8cdded New module 'pipe2'.
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131 if ((fcntl_flags = fcntl (fd[1], F_GETFD, 0)) < 0
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
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132 || fcntl (fd[1], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1
e8d2c6fc33ad Use spaces for indentation, not tabs.
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133 || (fcntl_flags = fcntl (fd[0], F_GETFD, 0)) < 0
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
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134 || fcntl (fd[0], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1)
e8d2c6fc33ad Use spaces for indentation, not tabs.
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135 goto fail;
11870
ddd29d8cdded New module 'pipe2'.
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parents:
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136 }
ddd29d8cdded New module 'pipe2'.
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parents:
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137
11892
26347f7d2cac Move #ifs inside function.
Bruno Haible <bruno@clisp.org>
parents: 11881
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138 # if O_BINARY
11880
d5e0338c205a Support O_TEXT, O_BINARY on all platforms.
Bruno Haible <bruno@clisp.org>
parents: 11879
diff changeset
139 if (flags & O_BINARY)
11881
9e30ae0c65a0 Oops, fix last commit.
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parents: 11880
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140 {
17447
d8be19310ad9 accept4, dup3, pipe2: port to Cygwin
Paul Eggert <eggert@cs.ucla.edu>
parents: 17443
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141 set_binary_mode (fd[1], O_BINARY);
d8be19310ad9 accept4, dup3, pipe2: port to Cygwin
Paul Eggert <eggert@cs.ucla.edu>
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142 set_binary_mode (fd[0], O_BINARY);
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143 }
11880
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144 else if (flags & O_TEXT)
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145 {
17447
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146 set_binary_mode (fd[1], O_TEXT);
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147 set_binary_mode (fd[0], O_TEXT);
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148 }
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149 # endif
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150
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151 return 0;
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152
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153 #endif
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154
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Eric Blake <eblake@redhat.com>
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155 #if GNULIB_defined_O_NONBLOCK || \
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156 !((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__)
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157 fail:
ddd29d8cdded New module 'pipe2'.
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158 {
ddd29d8cdded New module 'pipe2'.
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159 int saved_errno = errno;
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160 close (fd[0]);
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161 close (fd[1]);
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Eric Blake <eblake@redhat.com>
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162 fd[0] = tmp[0];
52719068f9c2 pipe, pipe2: don't corrupt fd on error
Eric Blake <eblake@redhat.com>
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163 fd[1] = tmp[1];
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164 errno = saved_errno;
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165 return -1;
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166 }
15519
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Eric Blake <eblake@redhat.com>
parents: 15327
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167 #endif
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168 }