assert/assert-perr.c

   1 /* Copyright (C) 1994-1998,2001,2002,2005,2009 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <assert.h>
  20 #include <atomic.h>
  21 #include <libintl.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sysdep.h>
  26 #include <unistd.h>
  27
  28
  29 extern const char *__progname;
  30
  31 #ifdef USE_IN_LIBIO
  32 # include <wchar.h>
  33 # include <libio/iolibio.h>
  34 # define fflush(s) INTUSE(_IO_fflush) (s)
  35 #endif
  36
  37 /* This function, when passed an error number, a filename, and a line
  38    number, prints a message on the standard error stream of the form:
  39         a.c:10: foobar: Unexpected error: Computer bought the farm
  40    It then aborts program execution via a call to `abort'.  */
  41
  42 #ifdef FATAL_PREPARE_INCLUDE
  43 # include FATAL_PREPARE_INCLUDE
  44 #endif
  45
  46 void
  47 __assert_perror_fail (int errnum,
  48                       const char *file, unsigned int line,
  49                       const char *function)
  50 {
  51   char errbuf[1024];
  52   char *buf;
  53
  54 #ifdef FATAL_PREPARE
  55   FATAL_PREPARE;
  56 #endif
  57
  58   if (__asprintf (&buf, _("%s%s%s:%u: %s%sUnexpected error: %s.\n"),
  59                   __progname, __progname[0] ? ": " : "",
  60                   file, line,
  61                   function ? function : "", function ? ": " : "",
  62                   __strerror_r (errnum, errbuf, sizeof errbuf)) >= 0)
  63     {
  64       /* Print the message.  */
  65       (void) __fxprintf (NULL, "%s", buf);
  66       (void) fflush (stderr);
  67
  68       /* We have to free the old buffer since the application might
  69          catch the SIGABRT signal.  */
  70       char *old = atomic_exchange_acq (&__abort_msg, buf);
  71       free (old);
  72     }
  73   else
  74     {
  75       /* At least print a minimal message.  */
  76       static const char errstr[] = "Unexpected error.\n";
  77       __libc_write (STDERR_FILENO, errstr, sizeof (errstr) - 1);
  78     }
  79
  80   abort ();
  81 }
  82 libc_hidden_def (__assert_perror_fail)