usr/src/cmd/cmd-inet/lib/nwamd/logging.c

   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
  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
  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
  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
  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 }