usr/src/cmd/drd/drd_log.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 2006 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * Logging support for the DR Daemon
  31  */
  32
  33 #include <stdio.h>
  34 #include <stdarg.h>
  35 #include <string.h>
  36 #include <errno.h>
  37 #include <syslog.h>
  38
  39 #include "drd.h"
  40
  41 #define DRD_MAX_MSG_LEN         512
  42 #define DRD_MAX_TIME_LEN        32
  43
  44 static char *log_prio_str[] = {
  45         "EMERG: ",      /* LOG_EMERG */
  46         "ALERT: ",      /* LOG_ALERT */
  47         "CRIT: ",       /* LOG_CRIT */
  48         "ERROR: ",      /* LOG_ERR */
  49         "WARNING: ",    /* LOG_WARNING */
  50         "NOTICE: ",     /* LOG_NOTICE */
  51         "INFO: ",       /* LOG_INFO */
  52         ""              /* LOG_DEBUG */
  53 };
  54
  55 /*
  56  * Generate a timestamp string in the provided buffer.
  57  * If any errors are encountered, the function returns
  58  * with the buffer containing an empty string.
  59  */
  60 static void
  61 drd_timestamp(char *buf, size_t buflen)
  62 {
  63         struct tm       ltime;
  64         struct timeval  now;
  65
  66         if ((buf == NULL) || (buflen == 0))
  67                 return;
  68
  69         buf[0] = '\0';
  70
  71         if (gettimeofday(&now, NULL) != 0) {
  72                 (void) fprintf(stderr, "gettimeofday failed: %s\n",
  73                     strerror(errno));
  74                 return;
  75         }
  76
  77         if (localtime_r(&now.tv_sec, &ltime) == NULL) {
  78                 (void) fprintf(stderr, "localtime_r failed: %s\n",
  79                     strerror(errno));
  80                 return;
  81         }
  82
  83         if (strftime(buf, buflen, "%b %e %T ", &ltime) == 0) {
  84                 (void) fprintf(stderr, "strftime failed: buffer[%d] too "
  85                     "small\n", buflen);
  86                 /*
  87                  * On failure, the contents of the buffer
  88                  * are indeterminate. Restore it to a known
  89                  * state before returning.
  90                  */
  91                 buf[0] = '\0';
  92         }
  93 }
  94
  95 static void
  96 drd_log_msg(int prio, char *fmt, va_list vap)
  97 {
  98         char msgbuf[DRD_MAX_MSG_LEN];
  99         char timebuf[DRD_MAX_TIME_LEN] = "";
 100
 101         /* generate a timestamp for the SMF log */
 102         drd_timestamp(timebuf, sizeof (timebuf));
 103
 104         (void) vsnprintf(msgbuf, DRD_MAX_MSG_LEN, fmt, vap);
 105
 106         /*
 107          * Print the message to stderr. In daemon mode, it
 108          * will be sent to the SMF log. In standalone mode,
 109          * it will be sent to the controlling terminal.
 110          */
 111         (void) fprintf(stderr, "%s%s%s\n", timebuf, log_prio_str[prio], msgbuf);
 112
 113         if (drd_daemonized)
 114                 syslog(prio, msgbuf);
 115 }
 116
 117 void
 118 drd_err(char *fmt, ...)
 119 {
 120         va_list vap;
 121
 122         va_start(vap, fmt);
 123         drd_log_msg(LOG_ERR, fmt, vap);
 124         va_end(vap);
 125 }
 126
 127 void
 128 drd_info(char *fmt, ...)
 129 {
 130         va_list vap;
 131
 132         va_start(vap, fmt);
 133         drd_log_msg(LOG_INFO, fmt, vap);
 134         va_end(vap);
 135 }
 136
 137 void
 138 drd_dbg(char *fmt, ...)
 139 {
 140         va_list vap;
 141
 142         if (!drd_debug) {
 143                 /* not debugging */
 144                 return;
 145         }
 146
 147         va_start(vap, fmt);
 148         drd_log_msg(LOG_DEBUG, fmt, vap);
 149         va_end(vap);
 150 }