nmdb/log.c

   1
   2 #include <stdio.h>              /* vsprintf() */
   3 #include <stdarg.h>
   4 #include <sys/types.h>          /* open() */
   5 #include <sys/stat.h>
   6 #include <fcntl.h>
   7 #include <unistd.h>             /* write() */
   8 #include <string.h>             /* strcmp(), strerror() */
   9 #include <errno.h>              /* errno */
  10 #include <time.h>               /* time() and friends */
  11
  12 #include "log.h"
  13 #include "common.h"
  14
  15
  16 /* Logging file descriptor, -1 if logging is disabled */
  17 static int logfd = -1;
  18
  19
  20 int log_init(void)
  21 {
  22         if (settings.logfname == NULL) {
  23                 logfd = -1;
  24                 return 1;
  25         }
  26
  27         if (strcmp(settings.logfname, "-") == 0) {
  28                 logfd = 1;
  29                 return 1;
  30         }
  31
  32         logfd = open(settings.logfname, O_WRONLY | O_APPEND | O_CREAT, 0660);
  33         if (logfd < 0)
  34                 return 0;
  35
  36         return 1;
  37 }
  38
  39 int log_reopen(void)
  40 {
  41         /* Just call log_init(), it will do just fine as we don't need any
  42          * special considerations for reopens */
  43         return log_init();
  44 }
  45
  46 void wlog(const char *fmt, ...)
  47 {
  48         int r, tr;
  49         va_list ap;
  50         char str[MAX_LOG_STR];
  51         char timestr[MAX_LOG_STR];
  52         time_t t;
  53         struct tm *tmp;
  54
  55         if (logfd == -1)
  56                 return;
  57
  58         t = time(NULL);
  59         tmp = localtime(&t);
  60         tr = strftime(timestr, MAX_LOG_STR, "%F %H:%M:%S ", tmp);
  61
  62         va_start(ap, fmt);
  63         r = vsnprintf(str, MAX_LOG_STR, fmt, ap);
  64         va_end(ap);
  65
  66         write(logfd, timestr, tr);
  67         write(logfd, str, r);
  68 }
  69
  70 void errlog(const char *s)
  71 {
  72         wlog("%s: %s\n", s, strerror(errno));
  73 }
  74
  75 void write_pid()
  76 {
  77         FILE *f;
  78
  79         if (settings.pidfile == NULL)
  80                 return;
  81
  82         f = fopen(settings.pidfile, "w");
  83         if (f == NULL) {
  84                 errlog("Can't open pidfile for writing");
  85                 return;
  86         }
  87
  88         fprintf(f, "%d\n", getpid());
  89
  90         fclose(f);
  91 }
  92