/* Invoke pipe, but avoid some glitches.
- Copyright (C) 2005 Free Software Foundation, Inc.
+ Copyright (C) 2005-2006, 2009-2010 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Jim Meyering. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
#include "unistd-safer.h"
#include <unistd.h>
+#include <errno.h>
/* Like pipe, but ensure that neither of the file descriptors is
- STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO. */
+ STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO. Fail with ENOSYS on
+ platforms that lack pipe. */
int
pipe_safer (int fd[2])
{
- int fail = pipe (fd);
- if (fail)
- return fail;
-
- {
- int i;
- for (i = 0; i < 2; i++)
- {
- int f = fd_safer (fd[i]);
- if (f < 0)
- return -1;
- fd[i] = f;
- }
- }
-
- return 0;
+#if HAVE_PIPE
+ if (pipe (fd) == 0)
+ {
+ int i;
+ for (i = 0; i < 2; i++)
+ {
+ fd[i] = fd_safer (fd[i]);
+ if (fd[i] < 0)
+ {
+ int e = errno;
+ close (fd[1 - i]);
+ errno = e;
+ return -1;
+ }
+ }
+
+ return 0;
+ }
+#else
+ errno = ENOSYS;
+#endif
+
+ return -1;
}