64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
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/* closexec.c - set or clear the close-on-exec descriptor flag
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Copyright (C) 1991, 2004 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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The code is taken from glibc/manual/llio.texi */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "cloexec.h"
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#if HAVE_FCNTL_H
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# include <fcntl.h>
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#endif
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#ifndef FD_CLOEXEC
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# define FD_CLOEXEC 1
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#endif
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/* Set the `FD_CLOEXEC' flag of DESC if VALUE is true,
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or clear the flag if VALUE is false.
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Return true on success, or false on error with `errno' set. */
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bool
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set_cloexec_flag (int desc, bool value)
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{
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#if defined F_GETFD && defined F_SETFD
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int flags = fcntl (desc, F_GETFD, 0);
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int newflags;
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if (flags < 0)
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return false;
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newflags = (value ? flags | FD_CLOEXEC : flags & ~FD_CLOEXEC);
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return (flags == newflags
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|| fcntl (desc, F_SETFD, newflags) != -1);
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#else
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return true;
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#endif
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}
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