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