Annotation of embedaddon/miniupnpd/minissdpd/daemonize.c, revision 1.1.1.1
1.1 misho 1: /* $Id: daemonize.c,v 1.12 2011/05/27 09:35:02 nanard Exp $ */
2: /* MiniUPnP project
3: * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
4: * (c) 2006 Thomas Bernard
5: * This software is subject to the conditions detailed
6: * in the LICENCE file provided within the distribution */
7:
8: #include <sys/types.h>
9: #include <sys/stat.h>
10: #include <unistd.h>
11: #include <fcntl.h>
12: #include <stdio.h>
13: #include <stdlib.h>
14: #include <syslog.h>
15: #include <string.h>
16: #include <signal.h>
17:
18: #include "daemonize.h"
19: #include "config.h"
20:
21: #ifndef USE_DAEMON
22:
23: int
24: daemonize(void)
25: {
26: int pid, i;
27:
28: switch(fork())
29: {
30: /* fork error */
31: case -1:
32: perror("fork()");
33: exit(1);
34:
35: /* child process */
36: case 0:
37: /* obtain a new process group */
38: if( (pid = setsid()) < 0)
39: {
40: perror("setsid()");
41: exit(1);
42: }
43:
44: /* close all descriptors */
45: for (i=getdtablesize();i>=0;--i) close(i);
46:
47: i = open("/dev/null", O_RDWR); /* open stdin */
48: dup(i); /* stdout */
49: dup(i); /* stderr */
50:
51: umask(027);
52: chdir("/"); /* chdir to /tmp ? */
53:
54: return pid;
55:
56: /* parent process */
57: default:
58: exit(0);
59: }
60: }
61: #endif
62:
63: int
64: writepidfile(const char * fname, int pid)
65: {
66: char pidstring[16];
67: int pidstringlen;
68: int pidfile;
69:
70: if(!fname || fname[0] == '\0')
71: return -1;
72:
73: if( (pidfile = open(fname, O_WRONLY|O_CREAT, 0644)) < 0)
74: {
75: syslog(LOG_ERR, "Unable to open pidfile for writing %s: %m", fname);
76: return -1;
77: }
78:
79: pidstringlen = snprintf(pidstring, sizeof(pidstring), "%d\n", pid);
80: if(pidstringlen <= 0)
81: {
82: syslog(LOG_ERR,
83: "Unable to write to pidfile %s: snprintf(): FAILED", fname);
84: close(pidfile);
85: return -1;
86: }
87: else
88: {
89: if(write(pidfile, pidstring, pidstringlen) < 0)
90: syslog(LOG_ERR, "Unable to write to pidfile %s: %m", fname);
91: }
92:
93: close(pidfile);
94:
95: return 0;
96: }
97:
98: int
99: checkforrunning(const char * fname)
100: {
101: char buffer[64];
102: int pidfile;
103: pid_t pid;
104:
105: if(!fname || fname[0] == '\0')
106: return -1;
107:
108: if( (pidfile = open(fname, O_RDONLY)) < 0)
109: return 0;
110:
111: memset(buffer, 0, 64);
112:
113: if(read(pidfile, buffer, 63))
114: {
115: if( (pid = atol(buffer)) > 0)
116: {
117: if(!kill(pid, 0))
118: {
119: close(pidfile);
120: return -2;
121: }
122: }
123: }
124:
125: close(pidfile);
126:
127: return 0;
128: }
129:
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