Avoid ELF lookup race.
[glibc.git] / assert / assert-perr.c
blobf239fab86b54ab0915e4c90c1608a060b77dc463
1 /* Copyright (C) 1994-1998,2001,2002,2005,2009 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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. */
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>
29 extern const char *__progname;
31 #ifdef USE_IN_LIBIO
32 # include <wchar.h>
33 # include <libio/iolibio.h>
34 # define fflush(s) INTUSE(_IO_fflush) (s)
35 #endif
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'. */
42 #ifdef FATAL_PREPARE_INCLUDE
43 # include FATAL_PREPARE_INCLUDE
44 #endif
46 void
47 __assert_perror_fail (int errnum,
48 const char *file, unsigned int line,
49 const char *function)
51 char errbuf[1024];
52 char *buf;
54 #ifdef FATAL_PREPARE
55 FATAL_PREPARE;
56 #endif
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)
64 /* Print the message. */
65 (void) __fxprintf (NULL, "%s", buf);
66 (void) fflush (stderr);
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);
73 else
75 /* At least print a minimal message. */
76 static const char errstr[] = "Unexpected error.\n";
77 __libc_write (STDERR_FILENO, errstr, sizeof (errstr) - 1);
80 abort ();
82 libc_hidden_def (__assert_perror_fail)