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/* Duplicate a file descriptor result, avoiding clobbering
STD{IN,OUT,ERR}_FILENO, with specific flags.
Copyright (C) 2001, 2004-2006, 2009-2021 Free Software Foundation, Inc.
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 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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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, see <https://www.gnu.org/licenses/>. */
/* Written by Paul Eggert and Eric Blake. */
#include <config.h>
/* Specification. */
#include "unistd-safer.h"
#include <fcntl.h>
#include <unistd.h>
/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
STDERR_FILENO. If FLAG contains O_CLOEXEC, behave like
fcntl(F_DUPFD_CLOEXEC) rather than fcntl(F_DUPFD). */
int
dup_safer_flag (int fd, int flag)
{
#if defined(KMK_GREP) && defined(_MSC_VER)
int afd[STDERR_FILENO + 1];
int i;
for (i = 0; ; i++)
{
int fdNew = _dup(fd);
if (fdNew >= STDERR_FILENO + 1 || fdNew < 0)
{
while (i-- > 0)
close(afd[i]);
return fdNew;
}
afd[i] = fdNew;
}
#else
return fcntl (fd, (flag & O_CLOEXEC) ? F_DUPFD_CLOEXEC : F_DUPFD,
STDERR_FILENO + 1);
#endif
}
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