Annotation of embedaddon/ntp/ntpsnmpd/netsnmp_daemonize.c, revision 1.1.1.1
1.1 misho 1: /*
2: * system.c
3: */
4: /* Portions of this file are subject to the following copyright(s). See
5: * the Net-SNMP's COPYING file for more details and other copyrights
6: * that may apply:
7: */
8: /***********************************************************
9: Copyright 1992 by Carnegie Mellon University
10:
11: All Rights Reserved
12:
13: Permission to use, copy, modify, and distribute this software and its
14: documentation for any purpose and without fee is hereby granted,
15: provided that the above copyright notice appear in all copies and that
16: both that copyright notice and this permission notice appear in
17: supporting documentation, and that the name of CMU not be
18: used in advertising or publicity pertaining to distribution of the
19: software without specific, written prior permission.
20:
21: CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
22: ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
23: CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
24: ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
25: WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
26: ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
27: SOFTWARE.
28: ******************************************************************/
29: /*
30: * Portions of this file are copyrighted by:
31: * Copyright © 2003 Sun Microsystems, Inc. All rights reserved.
32: * Use is subject to license terms specified in the COPYING file
33: * distributed with the Net-SNMP package.
34: */
35: /*
36: * System dependent routines go here
37: */
38: #include <net-snmp/net-snmp-config.h>
39: #undef PACKAGE_BUGREPORT
40: #undef PACKAGE_NAME
41: #undef PACKAGE_STRING
42: #undef PACKAGE_TARNAME
43: #undef PACKAGE_VERSION
44: #include <config.h>
45:
46: #ifdef NEED_NETSNMP_DAEMONIZE
47:
48: #include <stdio.h>
49: #include <ctype.h>
50: #include <errno.h>
51:
52: #if HAVE_UNISTD_H
53: #include <unistd.h>
54: #endif
55: #if HAVE_STDLIB_H
56: #include <stdlib.h>
57: #endif
58:
59: #if TIME_WITH_SYS_TIME
60: # ifdef WIN32
61: # include <sys/timeb.h>
62: # else
63: # include <sys/time.h>
64: # endif
65: # include <time.h>
66: #else
67: # if HAVE_SYS_TIME_H
68: # include <sys/time.h>
69: # else
70: # include <time.h>
71: # endif
72: #endif
73:
74: #include <sys/types.h>
75:
76: #if HAVE_NETINET_IN_H
77: #include <netinet/in.h>
78: #endif
79:
80: #if HAVE_WINSOCK_H
81: #include <winsock.h>
82: #endif
83: #if HAVE_SYS_SOCKET_H
84: #include <sys/socket.h>
85: #endif
86: #if HAVE_NET_IF_H
87: #include <net/if.h>
88: #endif
89:
90: #if HAVE_SYS_SOCKIO_H
91: #include <sys/sockio.h>
92: #endif
93:
94: #if HAVE_SYS_IOCTL_H
95: #include <sys/ioctl.h>
96: #endif
97:
98: #ifdef HAVE_NLIST_H
99: #include <nlist.h>
100: #endif
101:
102: #if HAVE_SYS_FILE_H
103: #include <sys/file.h>
104: #endif
105:
106: #if HAVE_KSTAT_H
107: #include <kstat.h>
108: #endif
109:
110: #if HAVE_SYS_PARAM_H
111: #include <sys/param.h>
112: #endif
113: #if HAVE_SYS_SYSCTL_H
114: #include <sys/sysctl.h>
115: #endif
116:
117: #if HAVE_STRING_H
118: #include <string.h>
119: #else
120: #include <strings.h>
121: #endif
122:
123: #if HAVE_DMALLOC_H
124: #include <dmalloc.h>
125: #endif
126:
127: #ifdef HAVE_SYS_STAT_H
128: #include <sys/stat.h>
129: #endif
130: #if HAVE_FCNTL_H
131: #include <fcntl.h>
132: #endif
133:
134: #if defined(hpux10) || defined(hpux11)
135: #include <sys/pstat.h>
136: #endif
137:
138: #if HAVE_SYS_UTSNAME_H
139: #include <sys/utsname.h>
140: #endif
141:
142: #if HAVE_SYS_SYSTEMCFG_H
143: #include <sys/systemcfg.h>
144: #endif
145:
146: #if HAVE_SYS_SYSTEMINFO_H
147: #include <sys/systeminfo.h>
148: #endif
149:
150: #include <net-snmp/types.h>
151: #include <net-snmp/output_api.h>
152: #include <net-snmp/utilities.h>
153: #include <net-snmp/library/system.h> /* for "internal" definitions */
154:
155: #include <net-snmp/library/snmp_api.h>
156: #include <net-snmp/library/read_config.h> /* for get_temp_file_pattern() */
157:
158: #ifndef IFF_LOOPBACK
159: # define IFF_LOOPBACK 0
160: #endif
161:
162: #ifdef INADDR_LOOPBACK
163: # define LOOPBACK INADDR_LOOPBACK
164: #else
165: # define LOOPBACK 0x7f000001
166: #endif
167:
168: /**
169: * fork current process into the background.
170: *
171: * This function forks a process into the background, in order to
172: * become a daemon process. It does a few things along the way:
173: *
174: * - becoming a process/session group leader, and forking a second time so
175: * that process/session group leader can exit.
176: *
177: * - changing the working directory to /
178: *
179: * - closing stdin, stdout and stderr (unless stderr_log is set) and
180: * redirecting them to /dev/null
181: *
182: * @param quit_immediately : indicates if the parent process should
183: * exit after a successful fork.
184: * @param stderr_log : indicates if stderr is being used for
185: * logging and shouldn't be closed
186: * @returns -1 : fork error
187: * 0 : child process returning
188: * >0 : parent process returning. returned value is the child PID.
189: */
190: int
191: netsnmp_daemonize(int quit_immediately, int stderr_log)
192: {
193: int i = 0;
194: DEBUGMSGT(("daemonize","deamonizing...\n"));
195: #if HAVE_WORKING_FORK
196: /*
197: * Fork to return control to the invoking process and to
198: * guarantee that we aren't a process group leader.
199: */
200: i = fork();
201: if (i != 0) {
202: /* Parent. */
203: DEBUGMSGT(("daemonize","first fork returned %d.\n", i));
204: if(i == -1) {
205: snmp_log(LOG_ERR,"first fork failed (errno %d) in "
206: "netsnmp_daemonize()\n", errno);
207: return -1;
208: }
209: if (quit_immediately) {
210: DEBUGMSGT(("daemonize","parent exiting\n"));
211: exit(0);
212: }
213: } else {
214: /* Child. */
215: #ifdef HAVE_SETSID
216: /* Become a process/session group leader. */
217: setsid();
218: #endif
219: /*
220: * Fork to let the process/session group leader exit.
221: */
222: if ((i = fork()) != 0) {
223: DEBUGMSGT(("daemonize","second fork returned %d.\n", i));
224: if(i == -1) {
225: snmp_log(LOG_ERR,"second fork failed (errno %d) in "
226: "netsnmp_daemonize()\n", errno);
227: }
228: /* Parent. */
229: exit(0);
230: }
231: #ifndef WIN32
232: else {
233: /* Child. */
234:
235: DEBUGMSGT(("daemonize","child continuing\n"));
236:
237: /* Avoid keeping any directory in use. */
238: chdir("/");
239:
240: if (!stderr_log) {
241: /*
242: * Close inherited file descriptors to avoid
243: * keeping unnecessary references.
244: */
245: close(0);
246: close(1);
247: close(2);
248:
249: /*
250: * Redirect std{in,out,err} to /dev/null, just in
251: * case.
252: */
253: open("/dev/null", O_RDWR);
254: dup(0);
255: dup(0);
256: }
257: }
258: #endif /* !WIN32 */
259: }
260: #endif /* HAVE_WORKING_FORK */
261: return i;
262: }
263:
264: #else /* !NEED_NETSNMP_DAEMONIZE */
265: int netsnp_daemonize_bs;
266: #endif
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