log.c

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00001 /*
00002  * Copyright (C), 2000-2002 by Contributors to the monit codebase. 
00003  * All Rights Reserved.
00004  *
00005  * This program is free software; you can redistribute it and/or
00006  * modify it under the terms of the GNU General Public License as
00007  * published by the Free Software Foundation; either version 2 of the
00008  * License, or (at your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful, but
00011  * WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013  * General Public License for more details.
00014  * 
00015  * You should have received a copy of the GNU General Public License
00016  * along with this program; if not, write to the Free Software Foundation,
00017  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
00018  */
00019 
00020 #include <config.h>
00021 
00022 #include <stdio.h>
00023 #include <stdarg.h>
00024 #include <errno.h>
00025 #include <stdlib.h>
00026 #include <time.h>
00027 
00028 #ifdef HAVE_SYSLOG_H
00029 #include <syslog.h>
00030 #endif
00031 
00032 #ifdef HAVE_STRING_H
00033 #include <string.h>
00034 #endif
00035 
00036 #ifdef HAVE_STRINGS_H
00037 #include <strings.h>
00038 #endif
00039 
00040 #ifdef HAVE_UNISTD_H
00041 #include <unistd.h>
00042 #endif
00043 
00044 #ifdef HAVE_SYS_TYPES_H
00045 #include <sys/types.h>
00046 #endif
00047 
00048 #ifdef HAVE_SYS_STAT_H
00049 #include <sys/stat.h>
00050 #endif
00051 
00052 #include "monitor.h"
00053 
00054 
00055 /* Private variables */
00056 static FILE *LOG= NULL;
00057 static char time_str[STRLEN];
00058 
00059 /* Private prototypes */
00060 static int  open_log();
00061 static char *timestr(void);
00062 
00063 
00077 /* ------------------------------------------------------------------ Public */
00078 
00079 
00084 int log_init() {
00085 
00086   if ( !Run.dolog ) {
00087     
00088     return TRUE;
00089     
00090   }
00091 
00092   if ( !open_log() ) {
00093     
00094     return FALSE;
00095     
00096   }
00097 
00098   /* Register log_close to be
00099      called at program termination */
00100   atexit(log_close);
00101 
00102   return TRUE;
00103   
00104 }
00105 
00106 
00111 void log(const char *format, ...) {
00112   
00113   char msg[STRLEN];
00114   va_list ap;
00115   va_start(ap,format);
00116   vsnprintf(msg, STRLEN, format, ap);
00117   va_end(ap);
00118 
00119   if ( ! Run.dolog ) goto nolog;
00120 
00121   if ( Run.use_syslog ) {
00122     
00123     syslog(LOG_ERR|LOG_USER, "%s", msg);
00124     
00125   }
00126   else if ( LOG ) {
00127     
00128     fprintf(LOG,"[%s] %s", timestr(), msg);
00129     fflush(LOG);
00130     
00131   }
00132 
00133   nolog:
00134   
00135   if ( have_tty && Run.debug ) {
00136     
00137     fprintf(stdout, "%s", msg);
00138     fflush(stdout);
00139     
00140   }
00141   
00142 }
00143 
00144 
00148 void log_close() {
00149   
00150   if ( Run.use_syslog ) {
00151 
00152     closelog();
00153 
00154   }
00155   
00156   if ( LOG  && 0 != fclose(LOG) ) {
00157     
00158     error("%s: Error closing the log file -- %s\n",
00159       prog, STRERROR);
00160     
00161   }
00162 
00163   LOG= NULL;
00164   
00165 }
00166 
00167 
00172 int get_log_fd() {
00173 
00174   return ( LOG!=NULL?fileno(LOG):-1 );
00175 
00176 }
00177 
00178 
00179 /* ----------------------------------------------------------------- Private */
00180 
00181 
00185 static int open_log() {
00186  
00187   if ( Run.use_syslog ) {
00188     
00189     openlog(prog, LOG_PID, LOG_USER);
00190     
00191   } else {
00192 
00193     umask(LOGMASK);
00194     
00195     if ((LOG= fopen(Run.logfile,"a+")) == (FILE *)NULL) {
00196       
00197       error("%s: Error opening the log file '%s' for writing -- %s\n",
00198         prog, Run.logfile, STRERROR);
00199       
00200       return(FALSE);
00201       
00202     }
00203     
00204   }
00205 
00206   return TRUE;
00207   
00208 }
00209 
00210 
00215 static char *timestr() {
00216 
00217   time_t now;
00218   
00219   time(&now);
00220   if ( !strftime(time_str, STRLEN, TIMEFORMAT, localtime(&now)) ) {
00221     
00222     memset(time_str, 0, STRLEN);
00223 
00224   }
00225   
00226   return time_str;
00227   
00228 }
00229 
00230 
00231   
00232