log.c revision 1.3 
1/*	$NetBSD: log.c,v 1.3 2015/01/29 07:26:02 spz Exp $	*/
2/*	$OpenBSD: err.c,v 1.2 2002/06/25 15:50:15 mickey Exp $	*/
3
4/*
5 * log.c
6 *
7 * Based on err.c, which was adapted from OpenBSD libc *err* *warn* code.
8 *
9 * Copyright (c) 2005-2012 Niels Provos and Nick Mathewson
10 *
11 * Copyright (c) 2000 Dug Song <dugsong@monkey.org>
12 *
13 * Copyright (c) 1993
14 *	The Regents of the University of California.  All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 *    notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 *    notice, this list of conditions and the following disclaimer in the
23 *    documentation and/or other materials provided with the distribution.
24 * 3. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41#include "event2/event-config.h"
42#include <sys/cdefs.h>
43__RCSID("$NetBSD: log.c,v 1.3 2015/01/29 07:26:02 spz Exp $");
44
45#ifdef WIN32
46#include <winsock2.h>
47#define WIN32_LEAN_AND_MEAN
48#include <windows.h>
49#undef WIN32_LEAN_AND_MEAN
50#endif
51#include <sys/types.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <stdarg.h>
55#include <string.h>
56#include <errno.h>
57#include "event2/event.h"
58#include "event2/util.h"
59
60#include "log-internal.h"
61
62static void _warn_helper(int severity, const char *errstr, const char *fmt,
63    va_list ap);
64static void event_log(int severity, const char *msg);
65static void event_exit(int errcode) EV_NORETURN;
66
67static event_fatal_cb fatal_fn = NULL;
68
69void
70event_set_fatal_callback(event_fatal_cb cb)
71{
72	fatal_fn = cb;
73}
74
75static void
76event_exit(int errcode)
77{
78	if (fatal_fn) {
79		fatal_fn(errcode);
80		exit(errcode); /* should never be reached */
81	} else if (errcode == _EVENT_ERR_ABORT)
82		abort();
83	else
84		exit(errcode);
85}
86
87void
88event_err(int eval, const char *fmt, ...)
89{
90	va_list ap;
91
92	va_start(ap, fmt);
93	_warn_helper(_EVENT_LOG_ERR, strerror(errno), fmt, ap);
94	va_end(ap);
95	event_exit(eval);
96}
97
98void
99event_warn(const char *fmt, ...)
100{
101	va_list ap;
102
103	va_start(ap, fmt);
104	_warn_helper(_EVENT_LOG_WARN, strerror(errno), fmt, ap);
105	va_end(ap);
106}
107
108void
109event_sock_err(int eval, evutil_socket_t sock, const char *fmt, ...)
110{
111	va_list ap;
112	int err = evutil_socket_geterror(sock);
113
114	va_start(ap, fmt);
115	_warn_helper(_EVENT_LOG_ERR, evutil_socket_error_to_string(err), fmt, ap);
116	va_end(ap);
117	event_exit(eval);
118}
119
120void
121event_sock_warn(evutil_socket_t sock, const char *fmt, ...)
122{
123	va_list ap;
124	int err = evutil_socket_geterror(sock);
125
126	va_start(ap, fmt);
127	_warn_helper(_EVENT_LOG_WARN, evutil_socket_error_to_string(err), fmt, ap);
128	va_end(ap);
129}
130
131void
132event_errx(int eval, const char *fmt, ...)
133{
134	va_list ap;
135
136	va_start(ap, fmt);
137	_warn_helper(_EVENT_LOG_ERR, NULL, fmt, ap);
138	va_end(ap);
139	event_exit(eval);
140}
141
142void
143event_warnx(const char *fmt, ...)
144{
145	va_list ap;
146
147	va_start(ap, fmt);
148	_warn_helper(_EVENT_LOG_WARN, NULL, fmt, ap);
149	va_end(ap);
150}
151
152void
153event_msgx(const char *fmt, ...)
154{
155	va_list ap;
156
157	va_start(ap, fmt);
158	_warn_helper(_EVENT_LOG_MSG, NULL, fmt, ap);
159	va_end(ap);
160}
161
162void
163_event_debugx(const char *fmt, ...)
164{
165	va_list ap;
166
167	va_start(ap, fmt);
168	_warn_helper(_EVENT_LOG_DEBUG, NULL, fmt, ap);
169	va_end(ap);
170}
171
172static void
173_warn_helper(int severity, const char *errstr, const char *fmt, va_list ap)
174{
175	char buf[1024];
176	size_t len;
177
178	if (fmt != NULL)
179		evutil_vsnprintf(buf, sizeof(buf), fmt, ap);
180	else
181		buf[0] = '\0';
182
183	if (errstr) {
184		len = strlen(buf);
185		if (len < sizeof(buf) - 3) {
186			evutil_snprintf(buf + len, sizeof(buf) - len, ": %s", errstr);
187		}
188	}
189
190	event_log(severity, buf);
191}
192
193static event_log_cb log_fn = NULL;
194
195void
196event_set_log_callback(event_log_cb cb)
197{
198	log_fn = cb;
199}
200
201static void
202event_log(int severity, const char *msg)
203{
204	if (log_fn)
205		log_fn(severity, msg);
206	else {
207		const char *severity_str;
208		switch (severity) {
209		case _EVENT_LOG_DEBUG:
210			severity_str = "debug";
211			break;
212		case _EVENT_LOG_MSG:
213			severity_str = "msg";
214			break;
215		case _EVENT_LOG_WARN:
216			severity_str = "warn";
217			break;
218		case _EVENT_LOG_ERR:
219			severity_str = "err";
220			break;
221		default:
222			severity_str = "???";
223			break;
224		}
225		(void)fprintf(stderr, "[%s] %s\n", severity_str, msg);
226	}
227}
228