third_party/libevent/log.c

   1 /*      $OpenBSD: err.c,v 1.2 2002/06/25 15:50:15 mickey Exp $  */
   2
   3 /*
   4  * log.c
   5  *
   6  * Based on err.c, which was adapted from OpenBSD libc *err* *warn* code.
   7  *
   8  * Copyright (c) 2005 Nick Mathewson <nickm@freehaven.net>
   9  *
  10  * Copyright (c) 2000 Dug Song <dugsong@monkey.org>
  11  *
  12  * Copyright (c) 1993
  13  *      The Regents of the University of California.  All rights reserved.
  14  *
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions
  17  * are met:
  18  * 1. Redistributions of source code must retain the above copyright
  19  *    notice, this list of conditions and the following disclaimer.
  20  * 2. Redistributions in binary form must reproduce the above copyright
  21  *    notice, this list of conditions and the following disclaimer in the
  22  *    documentation and/or other materials provided with the distribution.
  23  * 3. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  */
  39
  40 #ifdef HAVE_CONFIG_H
  41 #include "config.h"
  42 #endif
  43
  44 #ifdef WIN32
  45 #define WIN32_LEAN_AND_MEAN
  46 #include <windows.h>
  47 #undef WIN32_LEAN_AND_MEAN
  48 #endif
  49 #include <sys/types.h>
  50 #ifdef HAVE_SYS_TIME_H
  51 #include <sys/time.h>
  52 #else
  53 #include <sys/_libevent_time.h>
  54 #endif
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <stdarg.h>
  58 #include <string.h>
  59 #include <errno.h>
  60 #include "event.h"
  61
  62 #include "log.h"
  63 #include "evutil.h"
  64
  65 static void _warn_helper(int severity, int log_errno, const char *fmt,
  66                          va_list ap);
  67 static void event_log(int severity, const char *msg);
  68
  69 void
  70 event_err(int eval, const char *fmt, ...)
  71 {
  72         va_list ap;
  73
  74         va_start(ap, fmt);
  75         _warn_helper(_EVENT_LOG_ERR, errno, fmt, ap);
  76         va_end(ap);
  77         exit(eval);
  78 }
  79
  80 void
  81 event_warn(const char *fmt, ...)
  82 {
  83         va_list ap;
  84
  85         va_start(ap, fmt);
  86         _warn_helper(_EVENT_LOG_WARN, errno, fmt, ap);
  87         va_end(ap);
  88 }
  89
  90 void
  91 event_errx(int eval, const char *fmt, ...)
  92 {
  93         va_list ap;
  94
  95         va_start(ap, fmt);
  96         _warn_helper(_EVENT_LOG_ERR, -1, fmt, ap);
  97         va_end(ap);
  98         exit(eval);
  99 }
 100
 101 void
 102 event_warnx(const char *fmt, ...)
 103 {
 104         va_list ap;
 105
 106         va_start(ap, fmt);
 107         _warn_helper(_EVENT_LOG_WARN, -1, fmt, ap);
 108         va_end(ap);
 109 }
 110
 111 void
 112 event_msgx(const char *fmt, ...)
 113 {
 114         va_list ap;
 115
 116         va_start(ap, fmt);
 117         _warn_helper(_EVENT_LOG_MSG, -1, fmt, ap);
 118         va_end(ap);
 119 }
 120
 121 void
 122 _event_debugx(const char *fmt, ...)
 123 {
 124         va_list ap;
 125
 126         va_start(ap, fmt);
 127         _warn_helper(_EVENT_LOG_DEBUG, -1, fmt, ap);
 128         va_end(ap);
 129 }
 130
 131 static void
 132 _warn_helper(int severity, int log_errno, const char *fmt, va_list ap)
 133 {
 134         char buf[1024];
 135         size_t len;
 136
 137         if (fmt != NULL)
 138                 evutil_vsnprintf(buf, sizeof(buf), fmt, ap);
 139         else
 140                 buf[0] = '\0';
 141
 142         if (log_errno >= 0) {
 143                 len = strlen(buf);
 144                 if (len < sizeof(buf) - 3) {
 145                         evutil_snprintf(buf + len, sizeof(buf) - len, ": %s",
 146                             strerror(log_errno));
 147                 }
 148         }
 149
 150         event_log(severity, buf);
 151 }
 152
 153 static event_log_cb log_fn = NULL;
 154
 155 void
 156 event_set_log_callback(event_log_cb cb)
 157 {
 158         log_fn = cb;
 159 }
 160
 161 static void
 162 event_log(int severity, const char *msg)
 163 {
 164         if (log_fn)
 165                 log_fn(severity, msg);
 166         else {
 167                 const char *severity_str;
 168                 switch (severity) {
 169                 case _EVENT_LOG_DEBUG:
 170                         severity_str = "debug";
 171                         break;
 172                 case _EVENT_LOG_MSG:
 173                         severity_str = "msg";
 174                         break;
 175                 case _EVENT_LOG_WARN:
 176                         severity_str = "warn";
 177                         break;
 178                 case _EVENT_LOG_ERR:
 179                         severity_str = "err";
 180                         break;
 181                 default:
 182                         severity_str = "???";
 183                         break;
 184                 }
 185                 (void)fprintf(stderr, "[%s] %s\n", severity_str, msg);
 186         }
 187 }