nscd/dbg_log.c

   1 /* Copyright (c) 1998-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published
   7    by the Free Software Foundation; version 2 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdarg.h>
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include <syslog.h>
  22 #include <unistd.h>
  23 #include "dbg_log.h"
  24 #include "nscd.h"
  25
  26 /* if in debug mode and we have a debug file, we write the messages to it,
  27    if in debug mode and no debug file, we write the messages to stderr,
  28    else to syslog.  */
  29
  30 static char *logfilename;
  31 FILE *dbgout;
  32 int debug_level;
  33
  34 void
  35 set_logfile (const char *logfile)
  36 {
  37   logfilename = strdup (logfile);
  38 }
  39
  40 int
  41 init_logfile (void)
  42 {
  43   if (logfilename)
  44     {
  45       dbgout = fopen64 (logfilename, "a");
  46       return dbgout == NULL ? 0 : 1;
  47     }
  48   return 1;
  49 }
  50
  51 void
  52 dbg_log (const char *fmt,...)
  53 {
  54   va_list ap;
  55   char msg2[512];
  56
  57   va_start (ap, fmt);
  58   vsnprintf (msg2, sizeof (msg2), fmt, ap);
  59
  60   if (debug_level > 0)
  61     {
  62       time_t t = time (NULL);
  63
  64       struct tm now;
  65       localtime_r (&t, &now);
  66
  67       char buf[256];
  68       strftime (buf, sizeof (buf), "%c", &now);
  69
  70       char msg[1024];
  71       snprintf (msg, sizeof (msg), "%s - %d: %s%s", buf, getpid (), msg2,
  72                 msg2[strlen (msg2) - 1] == '\n' ? "" : "\n");
  73       if (dbgout)
  74         {
  75           fputs (msg, dbgout);
  76           fflush (dbgout);
  77         }
  78       else
  79         fputs (msg, stderr);
  80     }
  81   else
  82     syslog (LOG_NOTICE, "%d %s", getpid (), msg2);
  83
  84   va_end (ap);
  85 }