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/* $OpenBSD: errno.c,v 1.2 2012/02/20 02:34:33 guenther Exp $ */
/* PUBLIC DOMAIN Sep 2011 <guenther@openbsd.org> */
/*
* Verify that &errno is different for each thread and is stable across
* context switches and in signal handlers
*/
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "test.h"
int *main_errno, *t1_errno, *t2_errno, **handler_errno;
pthread_t main_tid, t1_tid, t2_tid;
enum state
{
START,
T1_START,
T1_SIGNAL,
T1_CHECK2,
T1_EXIT,
} state;
pthread_mutex_t m;
pthread_cond_t c;
sigset_t sigusr2;
static void
set_state(enum state new_state)
{
CHECKe(pthread_mutex_lock(&m));
ASSERT(state == new_state - 1);
state = new_state;
CHECKe(pthread_cond_signal(&c));
CHECKe(pthread_mutex_unlock(&m));
}
static void
wait_for_state(enum state new_state)
{
CHECKe(pthread_mutex_lock(&m));
while(state != new_state)
CHECKe(pthread_cond_wait(&c, &m));
CHECKe(pthread_mutex_unlock(&m));
}
/*
* Yes, pthread_self() isn't async-signal-safe in general, but it should
* be okay for the regress test here
*/
static void
act_handler(int signal)
{
ASSERT(signal == SIGUSR1);
if (handler_errno == &main_errno) {
CHECKe(write(STDOUT_FILENO, "m", 1));
ASSERT(&errno == main_errno);
ASSERTe(errno, == EXDEV);
ASSERT(pthread_equal(t1_tid, pthread_self()));
} else if (handler_errno == &t1_errno) {
CHECKe(write(STDOUT_FILENO, "\n", 1));
ASSERT(&errno == t1_errno);
ASSERTe(errno, == EXDEV);
ASSERT(pthread_equal(t1_tid, pthread_self()));
errno = ENODEV;
CHECKe(kill(getpid(), SIGUSR2));
ASSERTe(errno, == ENODEV);
} else if (handler_errno == &t2_errno) {
CHECKe(write(STDOUT_FILENO, "2", 1));
ASSERT(&errno == t2_errno);
ASSERTe(errno, == EXDEV);
ASSERT(pthread_equal(t2_tid, pthread_self()));
} else {
PANIC("unknown thread in act_handler!");
}
}
void *
tmain(void *arg)
{
t1_errno = &errno;
ASSERT(t1_errno != main_errno);
ASSERT(*t1_errno == 0);
/* verify preservation across switch */
errno = EXDEV;
wait_for_state(T1_START);
t1_tid = pthread_self();
ASSERT(pthread_equal(main_tid, t1_tid) == 0);
ASSERT(&errno == t1_errno);
ASSERTe(*t1_errno, == EXDEV);
set_state(T1_SIGNAL);
ASSERT(&errno == t1_errno);
wait_for_state(T1_CHECK2);
ASSERTe(*t1_errno, == ENODEV);
ASSERT(&errno == t1_errno);
ASSERT(pthread_equal(t1_tid, pthread_self()));
set_state(T1_EXIT);
return (NULL);
}
int
main(int argc, char **argv)
{
struct sigaction act;
int r;
pthread_mutex_init(&m, NULL);
pthread_cond_init(&c, NULL);
state = START;
main_errno = &errno;
main_tid = pthread_self();
act.sa_handler = act_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
errno = 0;
CHECKe(sigaction(SIGUSR1, &act, NULL));
ASSERT(*main_errno == 0);
ASSERT(errno == 0);
/*
* we'll use SIGUSR2 for signal state change from act_handler,
* detecting it with sigwait(), so block it now
*/
CHECKe(sigaction(SIGUSR2, &act, NULL));
sigemptyset(&sigusr2);
sigaddset(&sigusr2, SIGUSR2);
CHECKr(pthread_sigmask(SIG_BLOCK, &sigusr2, NULL));
sched_yield();
ASSERT(&errno == main_errno);
/* do something to force an error */
r = close(11);
if (r != 0) {
ASSERT(r == -1);
ASSERTe(*main_errno, == EBADF);
ASSERTe(errno, == EBADF);
}
r = write(11, "", 1);
ASSERT(r == -1);
ASSERTe(*main_errno, == EBADF);
ASSERTe(errno, == EBADF);
/* verify that a succesfull syscall doesn't change errno */
CHECKe(write(STDOUT_FILENO, "X", 1));
ASSERTe(*main_errno, == EBADF);
ASSERTe(errno, == EBADF);
ASSERT(&errno == main_errno);
CHECKr(pthread_create(&t1_tid, NULL, tmain, NULL));
ASSERTe(*main_errno, == EBADF);
ASSERT(&errno == main_errno);
ASSERT(pthread_equal(main_tid, pthread_self()));
set_state(T1_START);
ASSERTe(*main_errno, == EBADF);
ASSERT(&errno == main_errno);
wait_for_state(T1_SIGNAL);
ASSERTe(*main_errno, == EBADF);
ASSERT(&errno == main_errno);
ASSERT(pthread_equal(main_tid, pthread_self()));
handler_errno = &t1_errno;
CHECKe(pthread_kill(t1_tid, SIGUSR1));
ASSERT(&errno == main_errno);
CHECKr(sigwait(&sigusr2, &r));
ASSERTe(*main_errno, == EBADF);
ASSERT(&errno == main_errno);
ASSERT(pthread_equal(main_tid, pthread_self()));
set_state(T1_CHECK2);
wait_for_state(T1_EXIT);
CHECKe(pthread_join(t1_tid, NULL));
ASSERT(&errno == main_errno);
ASSERT(pthread_equal(main_tid, pthread_self()));
SUCCEED;
}
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