source: branches/stable/mindi-busybox/networking/udhcp/common.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 2.5 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* common.c
3 *
4 * Functions for debugging and logging as well as some other
5 * simple helper functions.
6 *
7 * Russ Dill <Russ.Dill@asu.edu> 2001-2003
8 * Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
9 *
10 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
11 */
12
13#include <fcntl.h>
14#include <unistd.h>
15#include <errno.h>
16#include <string.h>
17#include <stdlib.h>
18#include <signal.h>
19#include <paths.h>
20#include <sys/socket.h>
21#include <stdarg.h>
22
23#include "common.h"
24#include "pidfile.h"
25
26
27static int daemonized;
28
29long uptime(void)
30{
31    struct sysinfo info;
32    sysinfo(&info);
33    return info.uptime;
34}
35
36
37/*
38 * This function makes sure our first socket calls
39 * aren't going to fd 1 (printf badness...) and are
40 * not later closed by daemon()
41 */
42static inline void sanitize_fds(void)
43{
44    int zero;
45    if ((zero = open(bb_dev_null, O_RDWR, 0)) < 0)
46        return;
47    while (zero < 3)
48        zero = dup(zero);
49    close(zero);
50}
51
52
53void udhcp_background(const char *pidfile)
54{
55#ifdef __uClinux__
56    LOG(LOG_ERR, "Cannot background in uclinux (yet)");
57#else /* __uClinux__ */
58    int pid_fd;
59
60    /* hold lock during fork. */
61    pid_fd = pidfile_acquire(pidfile);
62    if (daemon(0, 0) == -1) { /* bb_xdaemon? */
63        perror("fork");
64        exit(1);
65    }
66    daemonized++;
67    pidfile_write_release(pid_fd);
68#endif /* __uClinux__ */
69}
70
71
72#ifdef CONFIG_FEATURE_UDHCP_SYSLOG
73
74void udhcp_logging(int level, const char *fmt, ...)
75{
76    va_list p;
77    va_list p2;
78
79    va_start(p, fmt);
80    __va_copy(p2, p);
81    if (!daemonized) {
82        vprintf(fmt, p);
83        putchar('\n');
84    }
85    vsyslog(level, fmt, p2);
86    va_end(p);
87}
88
89#else
90
91
92static char *syslog_level_msg[] = {
93    [LOG_EMERG]   = "EMERGENCY!",
94    [LOG_ALERT]   = "ALERT!",
95    [LOG_CRIT]    = "critical!",
96    [LOG_WARNING] = "warning",
97    [LOG_ERR]     = "error",
98    [LOG_INFO]    = "info",
99    [LOG_DEBUG]   = "debug"
100};
101
102
103void udhcp_logging(int level, const char *fmt, ...)
104{
105    va_list p;
106
107    va_start(p, fmt);
108    if (!daemonized) {
109        printf("%s, ", syslog_level_msg[level]);
110        vprintf(fmt, p);
111        putchar('\n');
112    }
113    va_end(p);
114}
115#endif
116
117
118void udhcp_start_log_and_pid(const char *client_server, const char *pidfile)
119{
120    int pid_fd;
121
122    /* Make sure our syslog fd isn't overwritten */
123    sanitize_fds();
124
125    /* do some other misc startup stuff while we are here to save bytes */
126    pid_fd = pidfile_acquire(pidfile);
127    pidfile_write_release(pid_fd);
128
129    /* equivelent of doing a fflush after every \n */
130    setlinebuf(stdout);
131
132    if (ENABLE_FEATURE_UDHCP_SYSLOG)
133        openlog(client_server, LOG_PID | LOG_CONS, LOG_LOCAL0);
134
135    udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, BB_VER);
136}
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