/* 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 <fcntl.h>#include <unistd.h>#include <errno.h>#include <string.h>#include <stdlib.h>#include <signal.h>#include <paths.h>#include <sys/socket.h>#include <stdarg.h>#include "common.h"#include "pidfile.h"static int daemonized;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 zero;	if ((zero = open(bb_dev_null, O_RDWR, 0)) < 0)		return;	while (zero < 3)		zero = dup(zero);	close(zero);}void udhcp_background(const char *pidfile){#ifdef __uClinux__	LOG(LOG_ERR, "Cannot background in uclinux (yet)");#else /* __uClinux__ */	int pid_fd;	/* hold lock during fork. */	pid_fd = pidfile_acquire(pidfile);	if (daemon(0, 0) == -1) { /* bb_xdaemon? */		perror("fork");		exit(1);	}	daemonized++;	pidfile_write_release(pid_fd);#endif /* __uClinux__ */}#ifdef CONFIG_FEATURE_UDHCP_SYSLOGvoid udhcp_logging(int level, const char *fmt, ...){	va_list p;	va_list p2;	va_start(p, fmt);	__va_copy(p2, p);	if (!daemonized) {		vprintf(fmt, p);		putchar('\n');	}	vsyslog(level, fmt, p2);	va_end(p);}#elsestatic 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, ...){	va_list p;	va_start(p, fmt);	if (!daemonized) {		printf("%s, ", syslog_level_msg[level]);		vprintf(fmt, p);		putchar('\n');	}	va_end(p);}#endifvoid udhcp_start_log_and_pid(const char *client_server, 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(client_server, LOG_PID | LOG_CONS, LOG_LOCAL0);	udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, BB_VER);}