nscd/dbg_log.c

   1 /* Copyright (c) 1998, 2000, 2004 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    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <stdarg.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <syslog.h>
  24 #include <unistd.h>
  25 #include "dbg_log.h"
  26 #include "nscd.h"
  27
  28 /* if in debug mode and we have a debug file, we write the messages to it,
  29    if in debug mode and no debug file, we write the messages to stderr,
  30    else to syslog.  */
  31
  32 static char *logfilename;
  33 FILE *dbgout;
  34 int debug_level;
  35
  36 void
  37 set_logfile (const char *logfile)
  38 {
  39   logfilename = strdup (logfile);
  40 }
  41
  42 int
  43 init_logfile (void)
  44 {
  45   if (logfilename)
  46     {
  47       dbgout = fopen (logfilename, "a");
  48       return dbgout == NULL ? 0 : 1;
  49     }
  50   return 1;
  51 }
  52
  53 void
  54 dbg_log (const char *fmt,...)
  55 {
  56   va_list ap;
  57   char msg[512], msg2[512];
  58
  59   va_start (ap, fmt);
  60   vsnprintf (msg2, sizeof (msg), fmt, ap);
  61
  62   if (debug_level > 0)
  63     {
  64       snprintf (msg, sizeof (msg), "%d: %s%s", getpid (), msg2,
  65                 msg2[strlen (msg2) - 1] == '\n' ? "" : "\n");
  66       if (dbgout)
  67         {
  68           fputs (msg, dbgout);
  69           fflush (dbgout);
  70         }
  71       else
  72         fputs (msg, stderr);
  73     }
  74   else
  75     syslog (LOG_NOTICE, "%d %s", getpid (), msg2);
  76
  77   va_end (ap);
  78 }