[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /* common.c
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| 3 | *
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| 4 | * Functions for debugging and logging as well as some other
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| 5 | * simple helper functions.
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| 6 | *
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| 7 | * Russ Dill <Russ.Dill@asu.edu> 2001-2003
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| 8 | * Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
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| 9 | *
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| 10 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 11 | */
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| 12 |
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| 13 | #include <fcntl.h>
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| 14 | #include <unistd.h>
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| 15 | #include <errno.h>
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| 16 | #include <string.h>
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| 17 | #include <stdlib.h>
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| 18 | #include <signal.h>
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| 19 | #include <paths.h>
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| 20 | #include <sys/socket.h>
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| 21 | #include <stdarg.h>
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| 22 |
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| 23 | #include "common.h"
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| 24 | #include "pidfile.h"
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| 25 |
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| 26 |
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| 27 | static int daemonized;
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| 28 |
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| 29 | long uptime(void)
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| 30 | {
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| 31 | struct sysinfo info;
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| 32 | sysinfo(&info);
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| 33 | return info.uptime;
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| 34 | }
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| 35 |
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| 36 |
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| 37 | /*
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| 38 | * This function makes sure our first socket calls
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| 39 | * aren't going to fd 1 (printf badness...) and are
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| 40 | * not later closed by daemon()
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| 41 | */
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| 42 | static inline void sanitize_fds(void)
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| 43 | {
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| 44 | int zero;
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| 45 | if ((zero = open(bb_dev_null, O_RDWR, 0)) < 0)
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| 46 | return;
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| 47 | while (zero < 3)
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| 48 | zero = dup(zero);
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| 49 | close(zero);
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| 50 | }
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| 51 |
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| 52 |
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| 53 | void udhcp_background(const char *pidfile)
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| 54 | {
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| 55 | #ifdef __uClinux__
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| 56 | LOG(LOG_ERR, "Cannot background in uclinux (yet)");
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| 57 | #else /* __uClinux__ */
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| 58 | int pid_fd;
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| 59 |
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| 60 | /* hold lock during fork. */
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| 61 | pid_fd = pidfile_acquire(pidfile);
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| 62 | if (daemon(0, 0) == -1) { /* bb_xdaemon? */
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| 63 | perror("fork");
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| 64 | exit(1);
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| 65 | }
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| 66 | daemonized++;
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| 67 | pidfile_write_release(pid_fd);
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| 68 | #endif /* __uClinux__ */
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| 69 | }
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| 70 |
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| 71 |
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| 72 | #ifdef CONFIG_FEATURE_UDHCP_SYSLOG
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| 73 |
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| 74 | void udhcp_logging(int level, const char *fmt, ...)
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| 75 | {
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| 76 | va_list p;
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| 77 | va_list p2;
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| 78 |
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| 79 | va_start(p, fmt);
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| 80 | __va_copy(p2, p);
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| 81 | if (!daemonized) {
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| 82 | vprintf(fmt, p);
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| 83 | putchar('\n');
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| 84 | }
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| 85 | vsyslog(level, fmt, p2);
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| 86 | va_end(p);
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| 87 | }
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| 88 |
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| 89 | #else
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| 90 |
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| 91 |
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| 92 | static char *syslog_level_msg[] = {
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| 93 | [LOG_EMERG] = "EMERGENCY!",
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| 94 | [LOG_ALERT] = "ALERT!",
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| 95 | [LOG_CRIT] = "critical!",
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| 96 | [LOG_WARNING] = "warning",
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| 97 | [LOG_ERR] = "error",
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| 98 | [LOG_INFO] = "info",
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| 99 | [LOG_DEBUG] = "debug"
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| 100 | };
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| 101 |
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| 102 |
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| 103 | void udhcp_logging(int level, const char *fmt, ...)
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| 104 | {
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| 105 | va_list p;
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| 106 |
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| 107 | va_start(p, fmt);
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| 108 | if (!daemonized) {
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| 109 | printf("%s, ", syslog_level_msg[level]);
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| 110 | vprintf(fmt, p);
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| 111 | putchar('\n');
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| 112 | }
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| 113 | va_end(p);
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| 114 | }
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| 115 | #endif
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| 116 |
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| 117 |
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| 118 | void udhcp_start_log_and_pid(const char *client_server, const char *pidfile)
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| 119 | {
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| 120 | int pid_fd;
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| 121 |
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| 122 | /* Make sure our syslog fd isn't overwritten */
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| 123 | sanitize_fds();
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| 124 |
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| 125 | /* do some other misc startup stuff while we are here to save bytes */
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| 126 | pid_fd = pidfile_acquire(pidfile);
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| 127 | pidfile_write_release(pid_fd);
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| 128 |
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| 129 | /* equivelent of doing a fflush after every \n */
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| 130 | setlinebuf(stdout);
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| 131 |
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| 132 | if (ENABLE_FEATURE_UDHCP_SYSLOG)
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| 133 | openlog(client_server, LOG_PID | LOG_CONS, LOG_LOCAL0);
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| 134 |
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| 135 | udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, BB_VER);
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| 136 | }
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