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 
00116   ASSERT(format);
00117   
00118   va_start(ap,format);
00119   vsnprintf(msg, STRLEN, format, ap);
00120   va_end(ap);
00121 
00122   if(! Run.dolog) goto nolog;
00123 
00124   if(Run.use_syslog) {
00125     
00126     syslog(LOG_ERR|LOG_USER, "%s", msg);
00127     
00128   } else if(LOG) {
00129     
00130     fprintf(LOG,"[%s] %s", timestr(), msg);
00131     fflush(LOG);
00132     
00133   }
00134 
00135   nolog:
00136   if(Run.have_tty) {
00137     
00138     fprintf(stdout, "%s", msg);
00139     fflush(stdout);
00140     
00141   }
00142   
00143 }
00144 
00145 
00149 void log_close() {
00150   
00151   if(Run.use_syslog) {
00152 
00153     closelog();
00154 
00155   }
00156   
00157   if(LOG  && (0 != fclose(LOG))) {
00158     
00159     error("%s: Error closing the log file -- %s\n",
00160       prog, STRERROR);
00161     
00162   }
00163 
00164   LOG= NULL;
00165   
00166 }
00167 
00168 
00173 int get_log_fd() {
00174 
00175   return (LOG!=NULL?fileno(LOG):-1);
00176 
00177 }
00178 
00179 
00180 /* ----------------------------------------------------------------- Private */
00181 
00182 
00186 static int open_log() {
00187  
00188   if(Run.use_syslog) {
00189     
00190     openlog(prog, LOG_PID, LOG_USER);
00191     
00192   } else {
00193     
00194     umask(LOGMASK);
00195     
00196     if((LOG= fopen(Run.logfile,"a+")) == (FILE *)NULL) {
00197       
00198       error("%s: Error opening the log file '%s' for writing -- %s\n",
00199         prog, Run.logfile, STRERROR);
00200       
00201       return(FALSE);
00202       
00203     }
00204     
00205   }
00206 
00207   return TRUE;
00208   
00209 }
00210 
00211 
00216 static char *timestr() {
00217 
00218   time_t now;
00219   
00220   time(&now);
00221   if(!strftime(time_str, STRLEN, TIMEFORMAT, localtime(&now))) {
00222     
00223     memset(time_str, 0, STRLEN);
00224 
00225   }
00226   
00227   return time_str;
00228   
00229 }
00230 
00231 
00232   
00233