39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
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/* Duplicate a file descriptor result, avoiding clobbering
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STD{IN,OUT,ERR}_FILENO, with specific flags.
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Copyright (C) 2001, 2004-2006, 2009-2021 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 3 of the License, or
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(at your option) 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, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert and Eric Blake. */
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#include <config.h>
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/* Specification. */
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#include "unistd-safer.h"
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#include <fcntl.h>
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#include <unistd.h>
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/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
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STDERR_FILENO. If FLAG contains O_CLOEXEC, behave like
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fcntl(F_DUPFD_CLOEXEC) rather than fcntl(F_DUPFD). */
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int
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dup_safer_flag (int fd, int flag)
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{
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return fcntl (fd, (flag & O_CLOEXEC) ? F_DUPFD_CLOEXEC : F_DUPFD,
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STDERR_FILENO + 1);
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}
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