1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/* common.c
*
* Functions to assist in the writing and removing of pidfiles.
*
* Russ Dill <Russ.Dill@asu.edu> Soptember 2001
* Rewrited by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/socket.h>
#include "common.h"
static int daemonized;
#ifdef CONFIG_FEATURE_UDHCP_SYSLOG
void udhcp_logging(int level, const char *fmt, ...)
{
int e = errno;
va_list p;
va_list p2;
va_start(p, fmt);
__va_copy(p2, p);
if(!daemonized) {
vprintf(fmt, p);
putchar('\n');
fflush(stdout);
errno = e;
}
vsyslog(level, fmt, p2);
va_end(p);
}
void start_log(const char *client_server)
{
openlog(bb_applet_name, LOG_PID | LOG_CONS, LOG_LOCAL0);
udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
}
#else
static char *syslog_level_msg[] = {
[LOG_EMERG] = "EMERGENCY!",
[LOG_ALERT] = "ALERT!",
[LOG_CRIT] = "critical!",
[LOG_WARNING] = "warning",
[LOG_ERR] = "error",
[LOG_INFO] = "info",
[LOG_DEBUG] = "debug"
};
void udhcp_logging(int level, const char *fmt, ...)
{
int e = errno;
va_list p;
va_start(p, fmt);
if(!daemonized) {
printf("%s, ", syslog_level_msg[level]);
errno = e;
vprintf(fmt, p);
putchar('\n');
fflush(stdout);
}
va_end(p);
}
void start_log(const char *client_server)
{
udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
}
#endif
static const char *saved_pidfile;
static void exit_fun(void)
{
if (saved_pidfile) unlink(saved_pidfile);
}
void background(const char *pidfile)
{
int pid_fd = -1;
if (pidfile) {
pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644);
if (pid_fd < 0) {
LOG(LOG_ERR, "Unable to open pidfile %s: %m", pidfile);
} else {
lockf(pid_fd, F_LOCK, 0);
if(!saved_pidfile)
atexit(exit_fun); /* set atexit one only */
saved_pidfile = pidfile; /* but may be rewrite */
}
}
while (pid_fd >= 0 && pid_fd < 3) pid_fd = dup(pid_fd); /* don't let daemon close it */
if (daemon(0, 0) == -1) {
perror("fork");
exit(1);
}
daemonized++;
if (pid_fd >= 0) {
FILE *out;
if ((out = fdopen(pid_fd, "w")) != NULL) {
fprintf(out, "%d\n", getpid());
fclose(out);
}
lockf(pid_fd, F_UNLCK, 0);
close(pid_fd);
}
}
/* Signal handler */
int udhcp_signal_pipe[2];
static void signal_handler(int sig)
{
if (send(udhcp_signal_pipe[1], &sig, sizeof(sig), MSG_DONTWAIT) < 0) {
LOG(LOG_ERR, "Could not send signal: %m");
}
}
void udhcp_set_signal_pipe(int sig_add)
{
socketpair(AF_UNIX, SOCK_STREAM, 0, udhcp_signal_pipe);
signal(SIGUSR1, signal_handler);
signal(SIGTERM, signal_handler);
if(sig_add)
signal(sig_add, signal_handler);
}
|
