xref: /illumos-gate/usr/src/cmd/cmd-inet/lib/nwamd/logging.c (revision 6ba597c56d749c61b4f783157f63196d7b2445f0)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #include <pthread.h>
28 #include <stdarg.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <syslog.h>
32 
33 #include "util.h"
34 
35 /*
36  * logging.c - contains various logging functions.
37  */
38 
39 boolean_t debug = B_TRUE;
40 
41 /*
42  * This idea for having this function is so that you can drop a dtrace probe
43  * here and trace complete strings (not just those containing formatting).  Its
44  * important that we actually format the debug strings so we could trace them
45  * even if we choose not to send them to syslog.
46  */
47 static void
log_out(int severity,const char * str)48 log_out(int severity, const char *str)
49 {
50 	if (severity == LOG_DEBUG && !debug)
51 		return;
52 
53 	syslog(severity, str);
54 }
55 
56 static void
log_format(int severity,const char * fmt,va_list ap,char * buf,int bufsize)57 log_format(int severity, const char *fmt, va_list ap, char *buf, int bufsize)
58 {
59 	int offset;
60 	char vbuf[256];
61 
62 	if (buf == NULL) {
63 		buf = vbuf;
64 		bufsize = sizeof (vbuf);
65 	}
66 
67 	offset = snprintf(buf, bufsize, "%d: ", pthread_self());
68 	(void) vsnprintf(buf + offset, bufsize - offset, fmt, ap);
69 
70 	log_out(severity, buf);
71 }
72 
73 /*
74  * This function takes a syslog severity and uses it to determine what to do
75  * with the message (currently send it to syslog).
76  */
77 void
nlog(int severity,const char * fmt,...)78 nlog(int severity, const char *fmt, ...)
79 {
80 	va_list ap;
81 
82 	va_start(ap, fmt);
83 	log_format(severity, fmt, ap, NULL, 0);
84 	va_end(ap);
85 }
86 
87 void
pfail(const char * fmt,...)88 pfail(const char *fmt, ...)
89 {
90 	char *msg;
91 	va_list ap;
92 
93 	msg = malloc(256);
94 
95 	va_start(ap, fmt);
96 	log_format(LOG_ERR, fmt, ap, msg, 256);
97 	va_end(ap);
98 
99 	if (msg == NULL)
100 		msg = "ran out of memory exiting.  see log.";
101 
102 	(void) puts(msg);
103 	exit(EXIT_FAILURE);
104 }
105