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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "internal.h"
/* True if we forked into the background (used to control log messages). */
bool forked_into_background;
#ifndef WIN32
/* This is a separate function because RHEL 6-era gcc requires pragmas
* outside function scope.
*/
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-result"
static void
chdir_root (void)
{
chdir ("/");
}
#pragma GCC diagnostic pop
/* Run as a background process. If foreground is set (ie. -f or
* equivalent) then this does nothing. Otherwise it forks into the
* background and sets forked_into_background.
*/
void
fork_into_background (void)
{
pid_t pid;
if (foreground)
return;
pid = fork ();
if (pid == -1) {
perror ("fork");
exit (EXIT_FAILURE);
}
if (pid > 0) /* Parent process exits. */
exit (EXIT_SUCCESS);
chdir_root ();
/* By this point, stdin/out have been redirected to /dev/null.
* If not verbose, set stderr to the same as stdout as well.
*/
if (!verbose)
dup2 (STDOUT_FILENO, STDERR_FILENO);
forked_into_background = true;
debug ("forked into background (new pid = %d)", getpid ());
}
#else /* WIN32 */
void
fork_into_background (void)
{
if (foreground)
return;
fprintf (stderr, "nbdkit: You must use the -f option on Windows.\n");
NOT_IMPLEMENTED_ON_WINDOWS ("daemonizing");
}
#endif /* WIN32 */
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