nscd/dbg_log.c

   1 /* Copyright (c) 1998-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published
   6    by the Free Software Foundation; version 2 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <stdarg.h>
  18 #include <stdio.h>
  19 #include <string.h>
  20 #include <syslog.h>
  21 #include <unistd.h>
  22 #include "dbg_log.h"
  23 #include "nscd.h"
  24
  25 /* if in debug mode and we have a debug file, we write the messages to it,
  26    if in debug mode and no debug file, we write the messages to stderr,
  27    else to syslog.  */
  28
  29 static char *logfilename;
  30 FILE *dbgout;
  31 int debug_level;
  32
  33 void
  34 set_logfile (const char *logfile)
  35 {
  36   logfilename = strdup (logfile);
  37 }
  38
  39 int
  40 init_logfile (void)
  41 {
  42   if (logfilename)
  43     {
  44       dbgout = fopen64 (logfilename, "a");
  45       return dbgout == NULL ? 0 : 1;
  46     }
  47   return 1;
  48 }
  49
  50 void
  51 dbg_log (const char *fmt,...)
  52 {
  53   va_list ap;
  54   char msg2[512];
  55
  56   va_start (ap, fmt);
  57   vsnprintf (msg2, sizeof (msg2), fmt, ap);
  58
  59   if (debug_level > 0)
  60     {
  61       time_t t = time (NULL);
  62
  63       struct tm now;
  64       localtime_r (&t, &now);
  65
  66       char buf[256];
  67       strftime (buf, sizeof (buf), "%c", &now);
  68
  69       char msg[1024];
  70       snprintf (msg, sizeof (msg), "%s - %d: %s%s", buf, getpid (), msg2,
  71                 msg2[strlen (msg2) - 1] == '\n' ? "" : "\n");
  72       if (dbgout)
  73         {
  74           fputs (msg, dbgout);
  75           fflush (dbgout);
  76         }
  77       else
  78         fputs (msg, stderr);
  79     }
  80   else
  81     syslog (LOG_NOTICE, "%d %s", getpid (), msg2);
  82
  83   va_end (ap);
  84 }