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/*
* Unix SMB/CIFS implementation.
* Samba utility functions
* Copyright (C) Volker Lendecke 2014
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "system/filesys.h"
#include "close_low_fd.h"
#ifdef HAVE_VALGRIND_VALGRIND_H
#include <valgrind/valgrind.h>
#elif defined(HAVE_VALGRIND_H)
#include <valgrind.h>
#else
#define RUNNING_ON_VALGRIND 0
#endif
_PUBLIC_ int close_low_fd(int fd)
{
int ret, dev_null;
if (RUNNING_ON_VALGRIND) {
return 0;
}
dev_null = open("/dev/null", O_RDWR, 0);
if ((dev_null == -1) && (errno == ENFILE)) {
/*
* Try to free up an fd
*/
ret = close(fd);
if (ret != 0) {
return errno;
}
}
dev_null = open("/dev/null", O_RDWR, 0);
if (dev_null == -1) {
dev_null = open("/dev/null", O_WRONLY, 0);
}
if (dev_null == -1) {
return errno;
}
if (dev_null == fd) {
/*
* This can happen in the ENFILE case above
*/
return 0;
}
ret = dup2(dev_null, fd);
if (ret == -1) {
int err = errno;
close(dev_null);
return err;
}
close(dev_null);
return 0;
}
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