Mercurial > hg > octave-shane > gnulib-hg
annotate lib/pipe2.c @ 11880:d5e0338c205a
Support O_TEXT, O_BINARY on all platforms.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Sun, 23 Aug 2009 10:46:39 +0200 |
| parents | bd0609bf2760 |
| children | 9e30ae0c65a0 |
| rev | line source |
|---|---|
| 11870 | 1 /* Create a pipe, with specific opening flags. |
| 2 Copyright (C) 2009 Free Software Foundation, Inc. | |
| 3 | |
| 4 This program is free software; you can redistribute it and/or modify | |
| 5 it under the terms of the GNU General Public License as published by | |
| 6 the Free Software Foundation; either version 2, or (at your option) | |
| 7 any later version. | |
| 8 | |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public License along | |
| 15 with this program; if not, write to the Free Software Foundation, | |
| 16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | |
| 17 | |
| 18 #include <config.h> | |
| 19 | |
| 20 /* Specification. */ | |
| 21 #include <unistd.h> | |
| 22 | |
| 23 #include <errno.h> | |
| 24 #include <fcntl.h> | |
| 25 | |
| 26 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ | |
| 27 /* Native Woe32 API. */ | |
| 28 | |
| 29 # include <io.h> | |
| 30 | |
| 31 int | |
| 32 pipe2 (int fd[2], int flags) | |
| 33 { | |
| 34 /* Check the supported flags. */ | |
| 35 if ((flags & ~(O_CLOEXEC | O_BINARY | O_TEXT)) != 0) | |
| 36 { | |
| 37 errno = EINVAL; | |
| 38 return -1; | |
| 39 } | |
| 40 | |
| 41 return _pipe (fd, 4096, flags); | |
| 42 } | |
| 43 | |
| 44 #else | |
| 45 /* Unix API. */ | |
| 46 | |
| 47 # ifndef O_CLOEXEC | |
| 48 # define O_CLOEXEC 0 | |
| 49 # endif | |
| 50 | |
| 51 int | |
| 52 pipe2 (int fd[2], int flags) | |
| 53 { | |
| 54 /* Check the supported flags. */ | |
|
11880
d5e0338c205a
Support O_TEXT, O_BINARY on all platforms.
Bruno Haible <bruno@clisp.org>
parents:
11879
diff
changeset
|
55 if ((flags & ~(O_CLOEXEC | O_NONBLOCK | O_TEXT | O_BINARY)) != 0) |
| 11870 | 56 { |
| 57 errno = EINVAL; | |
| 58 return -1; | |
| 59 } | |
| 60 | |
| 61 if (pipe (fd) < 0) | |
| 62 return -1; | |
| 63 | |
| 64 /* POSIX <http://www.opengroup.org/onlinepubs/9699919799/functions/pipe.html> | |
| 65 says that initially, the O_NONBLOCK and FD_CLOEXEC flags are cleared on | |
| 66 both fd[0] amd fd[1]. */ | |
| 67 | |
| 68 if (flags & O_NONBLOCK) | |
| 69 { | |
| 70 int fcntl_flags; | |
| 71 | |
| 72 if ((fcntl_flags = fcntl (fd[1], F_GETFL, 0)) < 0 | |
|
11879
bd0609bf2760
Fix test of fcntl's return value.
Bruno Haible <bruno@clisp.org>
parents:
11870
diff
changeset
|
73 || fcntl (fd[1], F_SETFL, fcntl_flags | O_NONBLOCK) == -1 |
| 11870 | 74 || (fcntl_flags = fcntl (fd[0], F_GETFL, 0)) < 0 |
|
11879
bd0609bf2760
Fix test of fcntl's return value.
Bruno Haible <bruno@clisp.org>
parents:
11870
diff
changeset
|
75 || fcntl (fd[0], F_SETFL, fcntl_flags | O_NONBLOCK) == -1) |
| 11870 | 76 goto fail; |
| 77 } | |
| 78 | |
| 79 if (flags & O_CLOEXEC) | |
| 80 { | |
| 81 int fcntl_flags; | |
| 82 | |
| 83 if ((fcntl_flags = fcntl (fd[1], F_GETFD, 0)) < 0 | |
|
11879
bd0609bf2760
Fix test of fcntl's return value.
Bruno Haible <bruno@clisp.org>
parents:
11870
diff
changeset
|
84 || fcntl (fd[1], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1 |
| 11870 | 85 || (fcntl_flags = fcntl (fd[0], F_GETFD, 0)) < 0 |
|
11879
bd0609bf2760
Fix test of fcntl's return value.
Bruno Haible <bruno@clisp.org>
parents:
11870
diff
changeset
|
86 || fcntl (fd[0], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1) |
| 11870 | 87 goto fail; |
| 88 } | |
| 89 | |
|
11880
d5e0338c205a
Support O_TEXT, O_BINARY on all platforms.
Bruno Haible <bruno@clisp.org>
parents:
11879
diff
changeset
|
90 #if O_BINARY |
|
d5e0338c205a
Support O_TEXT, O_BINARY on all platforms.
Bruno Haible <bruno@clisp.org>
parents:
11879
diff
changeset
|
91 if (flags & O_BINARY) |
|
d5e0338c205a
Support O_TEXT, O_BINARY on all platforms.
Bruno Haible <bruno@clisp.org>
parents:
11879
diff
changeset
|
92 setmode (fd, O_BINARY); |
|
d5e0338c205a
Support O_TEXT, O_BINARY on all platforms.
Bruno Haible <bruno@clisp.org>
parents:
11879
diff
changeset
|
93 else if (flags & O_TEXT) |
|
d5e0338c205a
Support O_TEXT, O_BINARY on all platforms.
Bruno Haible <bruno@clisp.org>
parents:
11879
diff
changeset
|
94 setmode (fd, O_TEXT); |
|
d5e0338c205a
Support O_TEXT, O_BINARY on all platforms.
Bruno Haible <bruno@clisp.org>
parents:
11879
diff
changeset
|
95 #endif |
|
d5e0338c205a
Support O_TEXT, O_BINARY on all platforms.
Bruno Haible <bruno@clisp.org>
parents:
11879
diff
changeset
|
96 |
| 11870 | 97 return 0; |
| 98 | |
| 99 fail: | |
| 100 { | |
| 101 int saved_errno = errno; | |
| 102 close (fd[0]); | |
| 103 close (fd[1]); | |
| 104 errno = saved_errno; | |
| 105 return -1; | |
| 106 } | |
| 107 } | |
| 108 | |
| 109 #endif |