networking/udhcp/common.c

/* vi: set sw=4 ts=4: */
/* common.c
 *
 * Functions for debugging and logging as well as some other
 * simple helper functions.
 *
 * Russ Dill <Russ.Dill@asu.edu> 2001-2003
 * Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include <syslog.h>

#include "common.h"


long uptime(void)
{
	struct sysinfo info;
	sysinfo(&info);
	return info.uptime;
}

/*
 * This function makes sure our first socket calls
 * aren't going to fd 1 (printf badness...) and are
 * not later closed by daemon()
 */
static inline void sanitize_fds(void)
{
	int fd = xopen(bb_dev_null, O_RDWR);
	while (fd < 3)
		fd = dup(fd);
	close(fd);
}


void udhcp_background(const char *pidfile)
{
#ifdef __uClinux__
	bb_error_msg("cannot background in uclinux (yet)");
#else /* __uClinux__ */
	int pid_fd;

	/* hold lock during fork. */
	pid_fd = pidfile_acquire(pidfile);
	setsid();
	xdaemon(0, 0);
	logmode &= ~LOGMODE_STDIO;
	pidfile_write_release(pid_fd);
#endif /* __uClinux__ */
}

void udhcp_start_log_and_pid(const char *pidfile)
{
	int pid_fd;

	/* Make sure our syslog fd isn't overwritten */
	sanitize_fds();

	/* do some other misc startup stuff while we are here to save bytes */
	pid_fd = pidfile_acquire(pidfile);
	pidfile_write_release(pid_fd);

	/* equivelent of doing a fflush after every \n */
	setlinebuf(stdout);

	if (ENABLE_FEATURE_UDHCP_SYSLOG) {
		openlog(applet_name, LOG_PID, LOG_LOCAL0);
		logmode |= LOGMODE_SYSLOG;
	}

	bb_info_msg("%s (v%s) started", applet_name, BB_VER);
}
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 <syslog.h>
14
15	#include "common.h"
16
17
18	long uptime(void)
19	{
20	struct sysinfo info;
21	sysinfo(&info);
22	return info.uptime;
23	}
24
25	/*
26	* This function makes sure our first socket calls
27	* aren't going to fd 1 (printf badness...) and are
28	* not later closed by daemon()
29	*/
30	static inline void sanitize_fds(void)
31	{
32	int fd = xopen(bb_dev_null, O_RDWR);
33	while (fd < 3)
34	fd = dup(fd);
35	close(fd);
36	}
37
38
39	void udhcp_background(const char *pidfile)
40	{
41	#ifdef __uClinux__
42	bb_error_msg("cannot background in uclinux (yet)");
43	#else /* __uClinux__ */
44	int pid_fd;
45
46	/* hold lock during fork. */
47	pid_fd = pidfile_acquire(pidfile);
48	setsid();
49	xdaemon(0, 0);
50	logmode &= ~LOGMODE_STDIO;
51	pidfile_write_release(pid_fd);
52	#endif /* __uClinux__ */
53	}
54
55	void udhcp_start_log_and_pid(const char *pidfile)
56	{
57	int pid_fd;
58
59	/* Make sure our syslog fd isn't overwritten */
60	sanitize_fds();
61
62	/* do some other misc startup stuff while we are here to save bytes */
63	pid_fd = pidfile_acquire(pidfile);
64	pidfile_write_release(pid_fd);
65
66	/* equivelent of doing a fflush after every \n */
67	setlinebuf(stdout);
68
69	if (ENABLE_FEATURE_UDHCP_SYSLOG) {
70	openlog(applet_name, LOG_PID, LOG_LOCAL0);
71	logmode \|= LOGMODE_SYSLOG;
72	}
73
74	bb_info_msg("%s (v%s) started", applet_name, BB_VER);
75	}