272 lines
6.5 KiB
C
272 lines
6.5 KiB
C
/*
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* system.c
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*/
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/* Portions of this file are subject to the following copyright(s). See
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* the Net-SNMP's COPYING file for more details and other copyrights
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* that may apply:
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*/
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/***********************************************************
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Copyright 1992 by Carnegie Mellon University
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of CMU not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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******************************************************************/
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/*
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* Portions of this file are copyrighted by:
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* Copyright © 2003 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms specified in the COPYING file
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* distributed with the Net-SNMP package.
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*/
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/*
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* System dependent routines go here
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*/
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#include <net-snmp/net-snmp-config.h>
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#undef PACKAGE_BUGREPORT
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#undef PACKAGE_NAME
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#undef PACKAGE_STRING
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#undef PACKAGE_TARNAME
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#undef PACKAGE_URL
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#undef PACKAGE_VERSION
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#include <config.h>
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#ifdef NEED_NETSNMP_DAEMONIZE
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#include <stdio.h>
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#include <ctype.h>
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#include <errno.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#if TIME_WITH_SYS_TIME
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# ifdef WIN32
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# include <sys/timeb.h>
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# else
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# include <sys/time.h>
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# endif
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# include <time.h>
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#else
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# if HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#include <sys/types.h>
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#if HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#if HAVE_WINSOCK_H
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#include <winsock.h>
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#endif
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#if HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#if HAVE_NET_IF_H
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#include <net/if.h>
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#endif
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#if HAVE_SYS_SOCKIO_H
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#include <sys/sockio.h>
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#endif
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#if HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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#ifdef HAVE_NLIST_H
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#include <nlist.h>
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#endif
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#if HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#if HAVE_KSTAT_H
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#include <kstat.h>
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#endif
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#if HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#if HAVE_SYS_SYSCTL_H
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#include <sys/sysctl.h>
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#endif
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#if HAVE_STRING_H
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#include <string.h>
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#else
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#include <strings.h>
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#endif
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#if HAVE_DMALLOC_H
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#include <dmalloc.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#if defined(hpux10) || defined(hpux11)
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#include <sys/pstat.h>
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#endif
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#if HAVE_SYS_UTSNAME_H
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#include <sys/utsname.h>
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#endif
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#if HAVE_SYS_SYSTEMCFG_H
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#include <sys/systemcfg.h>
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#endif
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#if HAVE_SYS_SYSTEMINFO_H
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#include <sys/systeminfo.h>
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#endif
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#include <net-snmp/types.h>
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#include <net-snmp/output_api.h>
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#include <net-snmp/utilities.h>
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#include <net-snmp/library/system.h> /* for "internal" definitions */
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#include <net-snmp/library/snmp_api.h>
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#include <net-snmp/library/read_config.h> /* for get_temp_file_pattern() */
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#ifndef IFF_LOOPBACK
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# define IFF_LOOPBACK 0
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#endif
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#ifdef INADDR_LOOPBACK
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# define LOOPBACK INADDR_LOOPBACK
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#else
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# define LOOPBACK 0x7f000001
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#endif
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/**
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* fork current process into the background.
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*
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* This function forks a process into the background, in order to
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* become a daemon process. It does a few things along the way:
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*
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* - becoming a process/session group leader, and forking a second time so
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* that process/session group leader can exit.
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*
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* - changing the working directory to /
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*
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* - closing stdin, stdout and stderr (unless stderr_log is set) and
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* redirecting them to /dev/null
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*
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* @param quit_immediately : indicates if the parent process should
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* exit after a successful fork.
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* @param stderr_log : indicates if stderr is being used for
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* logging and shouldn't be closed
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* @returns -1 : fork error
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* 0 : child process returning
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* >0 : parent process returning. returned value is the child PID.
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*/
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int
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netsnmp_daemonize(int quit_immediately, int stderr_log)
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{
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int i = 0;
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int saved_errno;
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DEBUGMSGT(("daemonize","deamonizing...\n"));
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#ifdef HAVE_WORKING_FORK
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/*
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* Fork to return control to the invoking process and to
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* guarantee that we aren't a process group leader.
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*/
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i = fork();
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if (i != 0) {
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/* Parent. */
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saved_errno = errno;
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DEBUGMSGT(("daemonize","first fork returned %d.\n", i));
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if(i == -1) {
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snmp_log(LOG_ERR,"first fork failed (errno %d) in "
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"netsnmp_daemonize()\n", saved_errno);
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return -1;
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}
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if (quit_immediately) {
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DEBUGMSGT(("daemonize","parent exiting\n"));
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exit(0);
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}
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} else {
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/* Child. */
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#ifdef HAVE_SETSID
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/* Become a process/session group leader. */
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setsid();
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#endif
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/*
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* Fork to let the process/session group leader exit.
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*/
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if ((i = fork()) != 0) {
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saved_errno = errno;
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DEBUGMSGT(("daemonize","second fork returned %d.\n", i));
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if(i == -1) {
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snmp_log(LOG_ERR,"second fork failed (errno %d) in "
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"netsnmp_daemonize()\n", saved_errno);
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}
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/* Parent. */
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exit(0);
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}
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#ifndef WIN32
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else {
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/* Child. */
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DEBUGMSGT(("daemonize","child continuing\n"));
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/* Avoid keeping any directory in use. */
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chdir("/");
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if (!stderr_log) {
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/*
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* Close inherited file descriptors to avoid
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* keeping unnecessary references.
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*/
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close(0);
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close(1);
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close(2);
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/*
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* Redirect std{in,out,err} to /dev/null, just in
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* case.
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*/
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open("/dev/null", O_RDWR);
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dup(0);
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dup(0);
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}
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}
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#endif /* !WIN32 */
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}
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#endif /* HAVE_WORKING_FORK */
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return i;
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}
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#else /* !NEED_NETSNMP_DAEMONIZE */
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int netsnp_daemonize_bs;
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#endif
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