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bfb1494e81
We should not skip all of close_low_fd() just because we detected valgrind headers at build time. Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Volker Lendecke <vl@samba.org>
76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
/*
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* Unix SMB/CIFS implementation.
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* Samba utility functions
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* Copyright (C) Volker Lendecke 2014
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*
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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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*
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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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*
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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 <http://www.gnu.org/licenses/>.
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*/
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#include "replace.h"
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#include "system/filesys.h"
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#include "close_low_fd.h"
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#ifdef HAVE_VALGRIND_VALGRIND_H
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#include <valgrind/valgrind.h>
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#elif defined(HAVE_VALGRIND_H)
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#include <valgrind.h>
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#else
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#define RUNNING_ON_VALGRIND 0
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#endif
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_PUBLIC_ int close_low_fd(int fd)
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{
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int ret, dev_null;
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if (RUNNING_ON_VALGRIND) {
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return 0;
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}
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dev_null = open("/dev/null", O_RDWR, 0);
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if ((dev_null == -1) && (errno == ENFILE)) {
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/*
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* Try to free up an fd
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*/
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ret = close(fd);
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if (ret != 0) {
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return errno;
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}
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}
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dev_null = open("/dev/null", O_RDWR, 0);
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if (dev_null == -1) {
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dev_null = open("/dev/null", O_WRONLY, 0);
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}
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if (dev_null == -1) {
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return errno;
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}
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if (dev_null == fd) {
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/*
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* This can happen in the ENFILE case above
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*/
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return 0;
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}
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ret = dup2(dev_null, fd);
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if (ret == -1) {
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int err = errno;
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close(dev_null);
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return err;
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}
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close(dev_null);
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return 0;
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}
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