login/programs/error.c

   1 /* Copyright (C) 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <stdarg.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <syslog.h>
  26
  27 #include "utmpd-private.h"
  28
  29
  30 /* This variable indicates if we have forked.  If set, we log messages
  31    via the system logger.  Otherwise we simply print the program name
  32    and the message to standard error.  */
  33 int forked = 0;
  34
  35
  36 /* Log error message MESSAGE, which is a printf-style format string
  37    with optional args.
  38    If ERRNUM is nonzero, also log its corresponding system error message.
  39    Exit with status STATUS if it is nonzero.  */
  40 void
  41 error (int status, int errnum, const char *message, ...)
  42 {
  43   va_list ap;
  44   char *buffer = NULL;
  45
  46   va_start (ap, message);
  47   vasprintf (&buffer, message, ap);
  48   va_end (ap);
  49
  50   if (forked)
  51     {
  52       if (errnum == 0)
  53         syslog (LOG_ERR, "%s", buffer);
  54       else
  55         syslog (LOG_ERR, "%s: %s", buffer, strerror (errnum));
  56     }
  57   else
  58     {
  59       if (errnum == 0)
  60         fprintf (stderr, "%s: %s\n", program_invocation_name, buffer);
  61       else
  62         fprintf (stderr, "%s: %s: %s\n", program_invocation_name, buffer,
  63                  strerror (errnum));
  64     }
  65
  66   if (buffer)
  67     free (buffer);
  68
  69   if (status)
  70     exit (status);
  71 }
  72
  73 /* Log warning message MESSAGE, which is a printf-style format string
  74    with optional args.
  75    If ERRNUM is nonzero, also log its corresponding system error message. */
  76 void
  77 warning (int errnum, const char *message, ...)
  78 {
  79   va_list ap;
  80   char *buffer = NULL;
  81
  82   va_start (ap, message);
  83   vasprintf (&buffer, message, ap);
  84   va_end (ap);
  85
  86   if (forked)
  87     {
  88       if (errnum == 0)
  89         syslog (LOG_WARNING, "%s", buffer);
  90       else
  91         syslog (LOG_WARNING, "%s: %s", buffer, strerror (errnum));
  92     }
  93   else
  94     {
  95       if (errnum == 0)
  96         printf ("%s: %s\n", program_invocation_name, buffer);
  97       else
  98         printf ("%s: %s: %s\n", program_invocation_name, buffer,
  99                 strerror (errnum));
 100     }
 101
 102   if (buffer)
 103     free (buffer);
 104 }