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9001cb1102
Redirect internal assertion failures to __libc_assert_fail, based on based on __libc_message, which writes directly to STDERR_FILENO and calls abort. Also disable message translation and reword the error message slightly (adjusting stdlib/tst-bz20544 accordingly). As a result of these changes, malloc no longer needs its own redefinition of __assert_fail. __libc_assert_fail needs to be stubbed out during rtld dependency analysis because the rtld rebuilds turn __libc_assert_fail into __assert_fail, which is unconditionally provided by elf/dl-minimal.c. This change is not possible for the public assert macro and its __assert_fail function because POSIX requires that the diagnostic is written to stderr. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <atomic.h>
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#include <ldsodefs.h>
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#include <libintl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sysdep.h>
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#include <unistd.h>
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#include <sys/mman.h>
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extern const char *__progname;
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#include <wchar.h>
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#include <libio/iolibio.h>
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#define fflush(s) _IO_fflush (s)
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/* This function, when passed a string containing an asserted
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expression, a filename, and a line number, prints a message
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on the standard error stream of the form:
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a.c:10: foobar: Assertion `a == b' failed.
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It then aborts program execution via a call to `abort'. */
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#ifdef FATAL_PREPARE_INCLUDE
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# include FATAL_PREPARE_INCLUDE
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#endif
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void
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__assert_fail_base (const char *fmt, const char *assertion, const char *file,
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unsigned int line, const char *function)
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{
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char *str;
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#ifdef FATAL_PREPARE
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FATAL_PREPARE;
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#endif
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int total;
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if (__asprintf (&str, fmt,
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__progname, __progname[0] ? ": " : "",
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file, line,
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function ? function : "", function ? ": " : "",
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assertion, &total) >= 0)
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{
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/* Print the message. */
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(void) __fxprintf (NULL, "%s", str);
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(void) fflush (stderr);
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total = (total + 1 + GLRO(dl_pagesize) - 1) & ~(GLRO(dl_pagesize) - 1);
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struct abort_msg_s *buf = __mmap (NULL, total, PROT_READ | PROT_WRITE,
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MAP_ANON | MAP_PRIVATE, -1, 0);
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if (__glibc_likely (buf != MAP_FAILED))
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{
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buf->size = total;
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strcpy (buf->msg, str);
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/* We have to free the old buffer since the application might
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catch the SIGABRT signal. */
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struct abort_msg_s *old = atomic_exchange_acq (&__abort_msg, buf);
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if (old != NULL)
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__munmap (old, old->size);
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}
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free (str);
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}
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else
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{
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/* At least print a minimal message. */
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static const char errstr[] = "Unexpected error.\n";
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__libc_write (STDERR_FILENO, errstr, sizeof (errstr) - 1);
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}
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abort ();
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}
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#undef __assert_fail
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void
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__assert_fail (const char *assertion, const char *file, unsigned int line,
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const char *function)
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{
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__assert_fail_base (_("%s%s%s:%u: %s%sAssertion `%s' failed.\n%n"),
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assertion, file, line, function);
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}
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