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