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openmpi/opal/util/daemon_init.c
Jeff Squyres 3a9179a0d7 Initial population of the opal tree
This commit was SVN r6267.
2005-07-02 13:43:20 +00:00

89 строки
2.5 KiB
C

/*
* Copyright (c) 2004-2005 The Trustees of Indiana University.
* All rights reserved.
* Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
* All rights reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "orte_config.h"
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include "include/orte_constants.h"
#include "util/daemon_init.h"
int orte_daemon_init(char *working_dir)
{
#ifndef WIN32
/* it seems that there is an entirely different way to write daemons in
WINDOWS land. Firstly, they are called services and the way to
go about it is to get a service handle annd then call CreateService()
So, I am guessing that this piece of code is called only by UNIX versions */
pid_t pid;
int fd;
if ((pid = fork()) < 0) {
return ORTE_ERROR;
} else if (pid != 0) {
exit(0); /* parent goes bye-bye */
}
/* child continues */
setsid(); /* become session leader */
if (NULL != working_dir) {
chdir(working_dir); /* change working directory */
}
umask(0); /* clear file mode creation mask */
/* connect input to /dev/null */
fd = open("/dev/null", O_RDONLY);
if(fd > STDIN_FILENO) {
dup2(fd, STDIN_FILENO);
close(fd);
}
/* connect outputs to /dev/null */
fd = open("/dev/null", O_RDWR|O_CREAT|O_TRUNC, 0666);
if (fd >= 0) {
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
/* just to be safe, make sure we aren't trying
* to close stdout or stderr! since we dup'd both
* of them to the same fd, we can't just close it
* since one of the two would still be open and
* someone could attempt to use it.
*/
if(fd != STDOUT_FILENO && fd != STDERR_FILENO) {
close(fd);
}
} else {
return ORTE_ERR_FATAL;
}
return ORTE_SUCCESS;
#else
printf ("This function has not been implemented in windows yet, file %s line %d\n", __FILE__, __LINE__);
abort();
#endif
}