1 /* $OpenBSD: log.c,v 1.1 2007/10/25 06:03:31 pyr Exp $ */ 2 3 /* 4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER 15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <errno.h> 20 #include <stdarg.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <string.h> 24 #include <syslog.h> 25 26 void log_init(int); 27 void log_warn(const char *, ...); 28 void log_warnx(const char *, ...); 29 void log_info(const char *, ...); 30 void log_debug(const char *, ...); 31 __dead void fatal(const char *); 32 __dead void fatalx(const char *); 33 34 int debug; 35 36 void vlog(int, const char *, va_list); 37 void logit(int, const char *, ...); 38 39 void 40 log_init(int n_debug) 41 { 42 extern char *__progname; 43 44 debug = n_debug; 45 46 if (!debug) 47 openlog(__progname, LOG_PID | LOG_NDELAY, LOG_DAEMON); 48 49 tzset(); 50 } 51 52 void 53 logit(int pri, const char *fmt, ...) 54 { 55 va_list ap; 56 57 va_start(ap, fmt); 58 vlog(pri, fmt, ap); 59 va_end(ap); 60 } 61 62 void 63 vlog(int pri, const char *fmt, va_list ap) 64 { 65 char *nfmt; 66 67 if (debug) { 68 /* best effort in out of mem situations */ 69 if (asprintf(&nfmt, "%s\n", fmt) == -1) { 70 vfprintf(stderr, fmt, ap); 71 fprintf(stderr, "\n"); 72 } else { 73 vfprintf(stderr, nfmt, ap); 74 free(nfmt); 75 } 76 fflush(stderr); 77 } else 78 vsyslog(pri, fmt, ap); 79 } 80 81 82 void 83 log_warn(const char *emsg, ...) 84 { 85 char *nfmt; 86 va_list ap; 87 88 /* best effort to even work in out of memory situations */ 89 if (emsg == NULL) 90 logit(LOG_CRIT, "%s", strerror(errno)); 91 else { 92 va_start(ap, emsg); 93 94 if (asprintf(&nfmt, "%s: %s", emsg, strerror(errno)) == -1) { 95 /* we tried it... */ 96 vlog(LOG_CRIT, emsg, ap); 97 logit(LOG_CRIT, "%s", strerror(errno)); 98 } else { 99 vlog(LOG_CRIT, nfmt, ap); 100 free(nfmt); 101 } 102 va_end(ap); 103 } 104 } 105 106 void 107 log_warnx(const char *emsg, ...) 108 { 109 va_list ap; 110 111 va_start(ap, emsg); 112 vlog(LOG_CRIT, emsg, ap); 113 va_end(ap); 114 } 115 116 void 117 log_info(const char *emsg, ...) 118 { 119 va_list ap; 120 121 va_start(ap, emsg); 122 vlog(LOG_INFO, emsg, ap); 123 va_end(ap); 124 } 125 126 void 127 log_debug(const char *emsg, ...) 128 { 129 va_list ap; 130 131 if (debug) { 132 va_start(ap, emsg); 133 vlog(LOG_DEBUG, emsg, ap); 134 va_end(ap); 135 } 136 } 137 138 void 139 fatal(const char *emsg) 140 { 141 if (emsg == NULL) 142 logit(LOG_CRIT, "fatal: %s", strerror(errno)); 143 else 144 if (errno) 145 logit(LOG_CRIT, "fatal: %s: %s", 146 emsg, strerror(errno)); 147 else 148 logit(LOG_CRIT, "fatal: %s", emsg); 149 150 exit(1); 151 } 152 153 void 154 fatalx(const char *emsg) 155 { 156 errno = 0; 157 fatal(emsg); 158 } 159