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glibc/debug/tst-backtrace5.c
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/* Test backtrace and backtrace_symbols for signal frames, where a | |
system call was interrupted by a signal. | |
Copyright (C) 2011-2016 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 <execinfo.h> | |
#include <search.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <sys/types.h> | |
#include <signal.h> | |
#include <unistd.h> | |
#include "tst-backtrace.h" | |
#ifndef SIGACTION_FLAGS | |
# define SIGACTION_FLAGS 0 | |
#endif | |
static int do_test (void); | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" | |
/* The backtrace should include at least handle_signal, a signal | |
trampoline, read, 3 * fn, and do_test. */ | |
#define NUM_FUNCTIONS 7 | |
void | |
handle_signal (int signum) | |
{ | |
void *addresses[NUM_FUNCTIONS]; | |
char **symbols; | |
int n; | |
int i; | |
/* Get the backtrace addresses. */ | |
n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0])); | |
printf ("Obtained backtrace with %d functions\n", n); | |
/* Check that there are at least seven functions. */ | |
if (n < NUM_FUNCTIONS) | |
{ | |
FAIL (); | |
return; | |
} | |
/* Convert them to symbols. */ | |
symbols = backtrace_symbols (addresses, n); | |
/* Check that symbols were obtained. */ | |
if (symbols == NULL) | |
{ | |
FAIL (); | |
return; | |
} | |
for (i = 0; i < n; ++i) | |
printf ("Function %d: %s\n", i, symbols[i]); | |
/* Check that the function names obtained are accurate. */ | |
if (!match (symbols[0], "handle_signal")) | |
{ | |
FAIL (); | |
return; | |
} | |
/* Do not check name for signal trampoline. */ | |
i = 2; | |
if (!match (symbols[i++], "read")) | |
{ | |
/* Perhaps symbols[2] is __kernel_vsyscall? */ | |
if (!match (symbols[i++], "read")) | |
{ | |
FAIL (); | |
return; | |
} | |
} | |
for (; i < n - 1; i++) | |
if (!match (symbols[i], "fn")) | |
{ | |
FAIL (); | |
return; | |
} | |
/* Symbol names are not available for static functions, so we do not | |
check do_test. */ | |
} | |
NO_INLINE int | |
fn (int c, int flags) | |
{ | |
pid_t parent_pid, child_pid; | |
int pipefd[2]; | |
char r[1]; | |
struct sigaction act; | |
if (c > 0) | |
{ | |
fn (c - 1, flags); | |
return x; | |
} | |
memset (&act, 0, sizeof (act)); | |
act.sa_handler = handle_signal; | |
act.sa_flags = flags; | |
sigemptyset (&act.sa_mask); | |
sigaction (SIGUSR1, &act, NULL); | |
parent_pid = getpid (); | |
if (pipe (pipefd) == -1) | |
abort (); | |
child_pid = fork (); | |
if (child_pid == (pid_t) -1) | |
abort (); | |
else if (child_pid == 0) | |
{ | |
sleep (1); | |
kill (parent_pid, SIGUSR1); | |
_exit (0); | |
} | |
/* In the parent. */ | |
read (pipefd[0], r, 1); | |
return 0; | |
} | |
NO_INLINE static int | |
do_test (void) | |
{ | |
fn (2, SIGACTION_FLAGS); | |
return ret; | |
} |