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glibc/assert/assert.c
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/* Copyright (C) 1991-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <assert.h> | |
#include <atomic.h> | |
#include <ldsodefs.h> | |
#include <libintl.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <sysdep.h> | |
#include <unistd.h> | |
#include <sys/mman.h> | |
extern const char *__progname; | |
#include <wchar.h> | |
#include <libio/iolibio.h> | |
#define fflush(s) _IO_fflush (s) | |
/* This function, when passed a string containing an asserted | |
expression, a filename, and a line number, prints a message | |
on the standard error stream of the form: | |
a.c:10: foobar: Assertion `a == b' failed. | |
It then aborts program execution via a call to `abort'. */ | |
#ifdef FATAL_PREPARE_INCLUDE | |
# include FATAL_PREPARE_INCLUDE | |
#endif | |
void | |
__assert_fail_base (const char *fmt, const char *assertion, const char *file, | |
unsigned int line, const char *function) | |
{ | |
char *str; | |
#ifdef FATAL_PREPARE | |
FATAL_PREPARE; | |
#endif | |
int total; | |
if (__asprintf (&str, fmt, | |
__progname, __progname[0] ? ": " : "", | |
file, line, | |
function ? function : "", function ? ": " : "", | |
assertion, &total) >= 0) | |
{ | |
/* Print the message. */ | |
(void) __fxprintf (NULL, "%s", str); | |
(void) fflush (stderr); | |
total = (total + 1 + GLRO(dl_pagesize) - 1) & ~(GLRO(dl_pagesize) - 1); | |
struct abort_msg_s *buf = __mmap (NULL, total, PROT_READ | PROT_WRITE, | |
MAP_ANON | MAP_PRIVATE, -1, 0); | |
if (__glibc_likely (buf != MAP_FAILED)) | |
{ | |
buf->size = total; | |
strcpy (buf->msg, str); | |
/* We have to free the old buffer since the application might | |
catch the SIGABRT signal. */ | |
struct abort_msg_s *old = atomic_exchange_acq (&__abort_msg, buf); | |
if (old != NULL) | |
__munmap (old, old->size); | |
} | |
free (str); | |
} | |
else | |
{ | |
/* At least print a minimal message. */ | |
static const char errstr[] = "Unexpected error.\n"; | |
__libc_write (STDERR_FILENO, errstr, sizeof (errstr) - 1); | |
} | |
abort (); | |
} | |
#undef __assert_fail | |
void | |
__assert_fail (const char *assertion, const char *file, unsigned int line, | |
const char *function) | |
{ | |
__assert_fail_base (_("%s%s%s:%u: %s%sAssertion `%s' failed.\n%n"), | |
assertion, file, line, function); | |
} | |
hidden_def(__assert_fail) |