xenocara/xserver/test/os.c

167 lines
4.2 KiB
C

/**
* Copyright © 2012 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include <signal.h>
#include "os.h"
static int last_signal = 0;
static int expect_signal = 0;
static void sighandler(int signal)
{
assert(expect_signal);
expect_signal = 0;
if (!last_signal)
raise(signal);
OsBlockSignals();
OsReleaseSignals();
last_signal = 1;
expect_signal = 1;
}
static int
sig_is_blocked(int sig)
{
sigset_t current;
sigemptyset(&current);
assert(sigprocmask(SIG_BLOCK, NULL, &current) == 0);
return sigismember(&current, sig);
}
static void block_sigio_test(void)
{
#ifdef SIG_BLOCK
sigset_t current;
sigemptyset(&current);
assert(!sig_is_blocked(SIGIO));
/* block once */
OsBlockSIGIO();
assert(sig_is_blocked(SIGIO));
OsReleaseSIGIO();
assert(!sig_is_blocked(SIGIO));
/* block twice, nested */
OsBlockSIGIO();
assert(sig_is_blocked(SIGIO));
OsBlockSIGIO();
assert(sig_is_blocked(SIGIO));
OsReleaseSIGIO();
assert(sig_is_blocked(SIGIO));
OsReleaseSIGIO();
assert(!sig_is_blocked(SIGIO));
/* block all */
OsBlockSignals();
assert(sig_is_blocked(SIGIO));
OsReleaseSignals();
assert(!sig_is_blocked(SIGIO));
/* block all nested */
OsBlockSignals();
assert(sig_is_blocked(SIGIO));
OsBlockSignals();
assert(sig_is_blocked(SIGIO));
OsReleaseSignals();
assert(sig_is_blocked(SIGIO));
OsReleaseSignals();
assert(!sig_is_blocked(SIGIO));
/* mix the two */
/* ABBA */
OsBlockSignals();
assert(sig_is_blocked(SIGIO));
OsBlockSIGIO();
assert(sig_is_blocked(SIGIO));
OsReleaseSIGIO();
assert(sig_is_blocked(SIGIO));
OsReleaseSignals();
assert(!sig_is_blocked(SIGIO));
/* ABAB */
OsBlockSignals();
assert(sig_is_blocked(SIGIO));
OsBlockSIGIO();
assert(sig_is_blocked(SIGIO));
OsReleaseSignals();
assert(sig_is_blocked(SIGIO));
OsReleaseSIGIO();
assert(!sig_is_blocked(SIGIO));
/* BAAB */
OsBlockSIGIO();
assert(sig_is_blocked(SIGIO));
OsBlockSignals();
assert(sig_is_blocked(SIGIO));
OsReleaseSignals();
assert(sig_is_blocked(SIGIO));
OsReleaseSIGIO();
assert(!sig_is_blocked(SIGIO));
/* BABA */
OsBlockSIGIO();
assert(sig_is_blocked(SIGIO));
OsBlockSignals();
assert(sig_is_blocked(SIGIO));
OsReleaseSIGIO();
assert(sig_is_blocked(SIGIO));
OsReleaseSignals();
assert(!sig_is_blocked(SIGIO));
#endif
}
static void block_sigio_test_nested(void)
{
#ifdef SIG_BLOCK
/* Check for bug releasing SIGIO during SIGIO signal handling.
test case:
raise signal
→ in signal handler:
raise signal
OsBlockSignals()
OsReleaseSignals()
tail guard
tail guard must be hit.
*/
void (*old_handler)(int);
old_handler = signal(SIGIO, sighandler);
expect_signal = 1;
assert(raise(SIGIO) == 0);
assert(signal(SIGIO, old_handler) == sighandler);
#endif
}
int
main(int argc, char **argv)
{
block_sigio_test();
block_sigio_test_nested();
return 0;
}