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d0d7f85f66
With upcoming fix for BZ#12683, pthread cancellation does not act for:
1. If syscall is blocked but with some side effects already having
taken place (e.g. a partial read or write).
2. After the syscall has returned.
The main change is due the fact programs need to act in syscalls with
side-effects (for instance, to avoid leak of allocated resources or
handle partial read/write).
This patch changes the NPTL testcase that assumes the old behavior and
also changes the tst-backtrace{5,6} to ignore the cancellable wrappers.
Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32,
aarch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu,
powerpc-linux-gnu, sparcv9-linux-gnu, and sparc64-linux-gnu.
* debug/tst-backtrace5.c (handle_signal): Avoid cancellable wrappers
in backtrace analysis.
* nptl/tst-cancel4.c (tf_write): Handle cancelled syscall with
side-effects.
(tf_send): Likewise.
141 lines
3.2 KiB
C
141 lines
3.2 KiB
C
/* Test backtrace and backtrace_symbols for signal frames, where a
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system call was interrupted by a signal.
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Copyright (C) 2011-2019 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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<http://www.gnu.org/licenses/>. */
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#include <execinfo.h>
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#include <search.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <unistd.h>
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#include "tst-backtrace.h"
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#ifndef SIGACTION_FLAGS
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# define SIGACTION_FLAGS 0
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#endif
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/* The backtrace should include at least handle_signal, a signal
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trampoline, read, 3 * fn, and do_test. */
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#define NUM_FUNCTIONS 7
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void
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handle_signal (int signum)
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{
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void *addresses[NUM_FUNCTIONS];
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char **symbols;
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int n;
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int i;
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/* Get the backtrace addresses. */
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n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));
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printf ("Obtained backtrace with %d functions\n", n);
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/* Check that there are at least seven functions. */
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if (n < NUM_FUNCTIONS)
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{
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FAIL ();
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return;
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}
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/* Convert them to symbols. */
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symbols = backtrace_symbols (addresses, n);
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/* Check that symbols were obtained. */
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if (symbols == NULL)
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{
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FAIL ();
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return;
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}
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for (i = 0; i < n; ++i)
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printf ("Function %d: %s\n", i, symbols[i]);
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/* Check that the function names obtained are accurate. */
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if (!match (symbols[0], "handle_signal"))
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{
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FAIL ();
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return;
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}
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/* Do not check name for signal trampoline or cancellable syscall
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wrappers (__syscall_cancel*). */
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for (; i < n - 1; i++)
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if (match (symbols[i], "read"))
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break;
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if (i == n - 1)
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{
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FAIL ();
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return;
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}
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for (; i < n - 1; i++)
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if (!match (symbols[i], "fn"))
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{
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FAIL ();
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return;
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}
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/* Symbol names are not available for static functions, so we do not
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check do_test. */
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}
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NO_INLINE int
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fn (int c, int flags)
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{
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pid_t parent_pid, child_pid;
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int pipefd[2];
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char r[1];
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struct sigaction act;
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if (c > 0)
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{
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fn (c - 1, flags);
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return x;
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}
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memset (&act, 0, sizeof (act));
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act.sa_handler = handle_signal;
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act.sa_flags = flags;
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sigemptyset (&act.sa_mask);
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sigaction (SIGUSR1, &act, NULL);
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parent_pid = getpid ();
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if (pipe (pipefd) == -1)
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abort ();
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child_pid = fork ();
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if (child_pid == (pid_t) -1)
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abort ();
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else if (child_pid == 0)
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{
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sleep (1);
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kill (parent_pid, SIGUSR1);
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_exit (0);
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}
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/* In the parent. */
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read (pipefd[0], r, 1);
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return 0;
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}
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NO_INLINE int
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do_test (void)
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{
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fn (2, SIGACTION_FLAGS);
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return ret;
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}
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#include <support/test-driver.c>
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