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