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/* Self tests for scoped_ignored_signal for GDB, the GNU debugger.
Copyright (C) 2021-2023 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbsupport/scoped_ignore_signal.h"
#include "gdbsupport/selftest.h"
#include "gdbsupport/scope-exit.h"
#include <unistd.h>
#include <signal.h>
namespace selftests {
namespace scoped_ignore_sig {
#ifdef SIGPIPE
/* True if the SIGPIPE handler ran. */
static volatile sig_atomic_t got_sigpipe = 0;
/* SIGPIPE handler for testing. */
static void
handle_sigpipe (int)
{
got_sigpipe = 1;
}
/* Test scoped_ignore_sigpipe. */
static void
test_sigpipe ()
{
auto *osig = signal (SIGPIPE, handle_sigpipe);
SCOPE_EXIT { signal (SIGPIPE, osig); };
#ifdef HAVE_SIGPROCMASK
/* Make sure SIGPIPE isn't blocked. */
sigset_t set, old_state;
sigemptyset (&set);
sigaddset (&set, SIGPIPE);
sigprocmask (SIG_UNBLOCK, &set, &old_state);
SCOPE_EXIT { sigprocmask (SIG_SETMASK, &old_state, nullptr); };
#endif
/* Create pipe, and close read end so that writes to the pipe fail
with EPIPE. */
int fd[2];
char c = 0xff;
int r;
r = pipe (fd);
SELF_CHECK (r == 0);
close (fd[0]);
SCOPE_EXIT { close (fd[1]); };
/* Check that writing to the pipe results in EPIPE. EXPECT_SIG
indicates whether a SIGPIPE signal is expected. */
auto check_pipe_write = [&] (bool expect_sig)
{
got_sigpipe = 0;
errno = 0;
r = write (fd[1], &c, 1);
SELF_CHECK (r == -1 && errno == EPIPE
&& got_sigpipe == expect_sig);
};
/* Check that without a scoped_ignore_sigpipe in scope we indeed get
a SIGPIPE signal. */
check_pipe_write (true);
/* Now check that with a scoped_ignore_sigpipe in scope, SIGPIPE is
ignored/blocked. */
{
scoped_ignore_sigpipe ignore1;
check_pipe_write (false);
/* Check that scoped_ignore_sigpipe nests correctly. */
{
scoped_ignore_sigpipe ignore2;
check_pipe_write (false);
}
/* If nesting works correctly, this write results in no
SIGPIPE. */
check_pipe_write (false);
}
/* No scoped_ignore_sigpipe is in scope anymore, so this should
result in a SIGPIPE signal. */
check_pipe_write (true);
}
#endif /* SIGPIPE */
} /* namespace scoped_ignore_sig */
} /* namespace selftests */
void _initialize_scoped_ignore_signal_selftests ();
void
_initialize_scoped_ignore_signal_selftests ()
{
#ifdef SIGPIPE
selftests::register_test ("scoped_ignore_sigpipe",
selftests::scoped_ignore_sig::test_sigpipe);
#endif
}
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