VBoxGuestR3LibDaemonize.cpp revision c125376ef076c2334e09915c77098cdfef3a4935
/** $Id$ */
/** @file
* VBoxGuestR3Lib - Ring-3 Support Library for VirtualBox guest additions, daemonize a process.
*/
/*
* Copyright (C) 2007 innotek GmbH
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#if defined(RT_OS_DARWIN)
# error "PORTME"
# define INCL_BASE
# define INCL_ERRORS
# include <os2.h>
#elif defined(RT_OS_WINDOWS)
# error "PORTME"
#else /* the unices */
# include <stdio.h>
# include <fcntl.h>
# include <stdlib.h>
# include <unistd.h>
# include <signal.h>
# include <errno.h>
#endif
#include <VBox/VBoxGuest.h>
/**
* Daemonize the process for running in the background.
*
* This is supposed to do the same job as the BSD daemon() call.
*
* @returns 0 on success
*
* @param fNoChDir Pass false to change working directory to root.
*/
{
#if defined(RT_OS_DARWIN)
# error "PORTME"
/* Get the full path to the executable. */
char szExe[CCHMAXPATH];
if (rc)
return RTErrConvertFromOS2(rc);
/* calc the length of the command line. */
char *pchArgs;
{
while (*pch);
}
else
{
if (cch1)
else
}
/* spawn a detach process */
char szObj[128];
RESULTCODES ResCodes = { 0, 0 };
szObj[0] = '\0';
rc = DosExecPgm(szObj, sizeof(szObj), EXEC_BACKGROUND, (PCSZ)pchArgs, NULL, &ResCodes, (PCSZ)szExe);
if (rc)
{
/* VBoxServiceError("DosExecPgm failed with rc=%d and szObj='%s'\n", rc, szObj); */
return RTErrConvertFromOS2(rc);
}
DosExit(EXIT_PROCESS, 0);
return VERR_GENERAL_FAILURE;
#elif defined(RT_OS_WINDOWS)
# error "PORTME"
#else /* the unices */
# ifdef RT_OS_SOLARIS
/*
* Check if we already belong the init process (pid 1).
*/
/** @todo Why do we need to check for this? */
if (getppid() == 1)
return VERR_GENERAL_FAILURE;
# endif
/*
* Fork the child process and quit the parent.
*
* On Linux we'll fork once more at the end of it all just to be sure that
* we're not leaving any zombies behind. The SIGHUP stuff is ignored because
* the parent may throw us one before we get to the setsid stuff one some
* systems (BSD).
*/
if (pid == -1)
return RTErrConvertFromErrno(errno);
if (pid != 0)
exit(0);
/*
* The orphaned child becomes is reparented to the init process.
* We create a new session for it (setsid), point the standard
*/
int SavedErrno = errno;
if (rcSigAct != -1)
if (newpgid == -1)
return RTErrConvertFromErrno(SavedErrno);
if (!fNoClose)
{
{
}
if (fd != -1)
{
if (fd > 2)
}
}
if (!fNoChDir)
chdir("/");
/*
* Change the umask - this is non-standard daemon() behavior.
*/
/** @todo why is umask set to 0 on linux? the solaris value is more sensible... */
# ifdef RT_OS_SOLARIS
umask(027);
# else
umask(0);
# endif
# ifdef RT_OS_LINUX
/*
* And fork again to avoid zomibies and stuff (non-standard daemon() behaviour).
*/
if (pid == -1)
return RTErrConvertFromErrno(errno);
if (pid != 0)
exit(0);
# endif /* RT_OS_LINUX */
return VINF_SUCCESS;
#endif
}