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/* libnih
*
* test_child.c - test suite for nih/child.c
*
* Copyright © 2009 Scott James Remnant <scott@netsplit.com>.
* Copyright © 2009 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <nih/test.h>
#if HAVE_VALGRIND_VALGRIND_H
#include <valgrind/valgrind.h>
#endif /* HAVE_VALGRIND_VALGRIND_H */
#include <sys/ptrace.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <unistd.h>
#include <nih/macros.h>
#include <nih/alloc.h>
#include <nih/list.h>
#include <nih/string.h>
#include <nih/child.h>
static int handler_called = 0;
static void *last_data = NULL;
static pid_t last_pid;
static NihChildEvents last_event = -1;
static int last_status;
static void
my_handler (void *data,
pid_t pid,
NihChildEvents event,
int status)
{
handler_called++;
last_data = data;
last_pid = pid;
last_event = event;
last_status = status;
}
void
test_add_watch (void)
{
NihChildWatch *watch;
TEST_FUNCTION ("nih_child_add_watch");
nih_child_poll ();
/* Check that we can add a watch on a specific pid, and that the
* structure is filled in correctly and part of a list.
*/
TEST_FEATURE ("with pid");
TEST_ALLOC_FAIL {
watch = nih_child_add_watch (NULL, getpid (), NIH_CHILD_EXITED,
my_handler, &watch);
if (test_alloc_failed) {
TEST_EQ_P (watch, NULL);
continue;
}
TEST_ALLOC_SIZE (watch, sizeof (NihChildWatch));
TEST_EQ (watch->pid, getpid ());
TEST_EQ (watch->events, NIH_CHILD_EXITED);
TEST_EQ_P (watch->handler, my_handler);
TEST_EQ_P (watch->data, &watch);
TEST_LIST_NOT_EMPTY (&watch->entry);
nih_free (watch);
}
/* Check that we can add a watch on a pid of -1, which represents
* any child.
*/
TEST_FEATURE ("with -1 for pid");
TEST_ALLOC_FAIL {
watch = nih_child_add_watch (NULL, -1, NIH_CHILD_ALL,
my_handler, &watch);
if (test_alloc_failed) {
TEST_EQ_P (watch, NULL);
continue;
}
TEST_ALLOC_SIZE (watch, sizeof (NihChildWatch));
TEST_EQ (watch->pid, -1);
TEST_EQ (watch->events, NIH_CHILD_ALL);
TEST_EQ_P (watch->handler, my_handler);
TEST_EQ_P (watch->data, &watch);
TEST_LIST_NOT_EMPTY (&watch->entry);
nih_free (watch);
}
}
void
test_poll (void)
{
NihChildWatch *watch;
siginfo_t siginfo;
pid_t pid, child;
unsigned long data;
char corefile[PATH_MAX + 1];
TEST_FUNCTION ("nih_child_poll");
/* Check that when a child exits normally, the handler receives
* an exited event and the zero status code and is then removed from
* the list and freed.
*/
TEST_FEATURE ("with normal termination");
TEST_CHILD (pid) {
exit (0);
}
watch = nih_child_add_watch (NULL, pid, NIH_CHILD_EXITED,
my_handler, &watch);
TEST_FREE_TAG (watch);
handler_called = 0;
last_data = NULL;
last_pid = 0;
last_event = -1;
last_status = 0;
waitid (P_PID, pid, &siginfo, WEXITED | WNOWAIT);
nih_child_poll ();
TEST_TRUE (handler_called);
TEST_EQ (last_pid, pid);
TEST_EQ (last_event, NIH_CHILD_EXITED);
TEST_EQ (last_status, 0);
TEST_FREE (watch);
/* Check that when a child exits with a non-zero status code, the
* reaper receives an exited event and the status code and is then
* removed from the list and freed.
*/
TEST_FEATURE ("with normal non-zero termination");
TEST_CHILD (pid) {
exit (123);
}
watch = nih_child_add_watch (NULL, pid, NIH_CHILD_EXITED,
my_handler, &watch);
TEST_FREE_TAG (watch);
handler_called = 0;
last_data = NULL;
last_pid = 0;
last_event = -1;
last_status = 0;
waitid (P_PID, pid, &siginfo, WEXITED | WNOWAIT);
nih_child_poll ();
TEST_TRUE (handler_called);
TEST_EQ (last_pid, pid);
TEST_EQ (last_event, NIH_CHILD_EXITED);
TEST_EQ (last_status, 123);
TEST_FREE (watch);
/* Check that when a child is killed by a signal, the reaper receives
* a killed event with the signal in the status field before being
* removed from the list and freed.
*/
TEST_FEATURE ("with termination by signal");
TEST_CHILD (pid) {
pause ();
}
watch = nih_child_add_watch (NULL, pid,
NIH_CHILD_KILLED | NIH_CHILD_DUMPED,
my_handler, &watch);
TEST_FREE_TAG (watch);
handler_called = 0;
last_data = NULL;
last_pid = 0;
last_event = -1;
last_status = 0;
kill (pid, SIGTERM);
waitid (P_PID, pid, &siginfo, WEXITED | WNOWAIT);
nih_child_poll ();
TEST_TRUE (handler_called);
TEST_EQ (last_pid, pid);
TEST_EQ (last_event, NIH_CHILD_KILLED);
TEST_EQ (last_status, SIGTERM);
TEST_FREE (watch);
/* Check that when a child is killed by aborting, the reaper receives
* a dumped event with the signal in the status field before being
* removed from the list and freed.
*/
TEST_FEATURE ("with termination by abort");
TEST_CHILD (pid) {
abort ();
}
watch = nih_child_add_watch (NULL, pid,
NIH_CHILD_KILLED | NIH_CHILD_DUMPED,
my_handler, &watch);
TEST_FREE_TAG (watch);
handler_called = 0;
last_data = NULL;
last_pid = 0;
last_event = -1;
last_status = 0;
waitid (P_PID, pid, &siginfo, WEXITED | WNOWAIT);
nih_child_poll ();
TEST_TRUE (handler_called);
TEST_EQ (last_pid, pid);
/* We might get killed if we never dumped core... fiddling with
* the limit doesn't help, since we might be under gdb and that
* never lets us dump core.
*/
if (last_event != NIH_CHILD_KILLED)
TEST_EQ (last_event, NIH_CHILD_DUMPED);
TEST_EQ (last_status, SIGABRT);
TEST_FREE (watch);
unlink ("core");
sprintf (corefile, "core.%d", pid);
unlink (corefile);
sprintf (corefile, "vgcore.%d", pid);
unlink (corefile);
/* Check that when a child emits the stopped signal, the reaper
* receives a stopped event with nothing relevant in the status field.
* It should not be removed from the list, since the child hasn't
* gone anyway.
*/
TEST_FEATURE ("with stopped child");
TEST_CHILD (pid) {
raise (SIGSTOP);
pause ();
exit (0);
}
watch = nih_child_add_watch (NULL, pid,
NIH_CHILD_STOPPED | NIH_CHILD_CONTINUED,
my_handler, &watch);
TEST_FREE_TAG (watch);
handler_called = 0;
last_data = NULL;
last_pid = 0;
last_event = -1;
last_status = 0;
waitid (P_PID, pid, &siginfo, WSTOPPED | WNOWAIT);
nih_child_poll ();
TEST_TRUE (handler_called);
TEST_EQ (last_pid, pid);
TEST_EQ (last_event, NIH_CHILD_STOPPED);
TEST_EQ (last_status, SIGSTOP);
TEST_NOT_FREE (watch);
/* Check that when the child is continued again, the reaper
* receives a continued event with nothing relevant in the status
* field. It should still not be removed from the list since the
* child still hasn't gone away.
*/
TEST_FEATURE ("with continued child");
handler_called = 0;
last_data = NULL;
last_pid = 0;
last_event = -1;
last_status = 0;
kill (pid, SIGCONT);
waitid (P_PID, pid, &siginfo, WCONTINUED | WNOWAIT);
nih_child_poll ();
TEST_TRUE (handler_called);
TEST_EQ (last_pid, pid);
TEST_EQ (last_event, NIH_CHILD_CONTINUED);
TEST_EQ (last_status, SIGCONT);
TEST_NOT_FREE (watch);
kill (pid, SIGTERM);
waitid (P_PID, pid, &siginfo, WEXITED);
nih_free (watch);
/* Check that a signal raised from a traced child causes the reaper
* to be called with a traced event and the event in the status
* field. It should not be removed from the list since the child
* hasn't gone away.
*/
TEST_FEATURE ("with signal from traced child");
TEST_CHILD (pid) {
assert0 (ptrace (PTRACE_TRACEME, 0, NULL, NULL));
raise (SIGSTOP);
raise (SIGCHLD);
pause ();
exit (0);
}
waitid (P_PID, pid, &siginfo, WSTOPPED);
assert0 (ptrace (PTRACE_SETOPTIONS, pid, NULL, PTRACE_O_TRACESYSGOOD));
assert0 (ptrace (PTRACE_CONT, pid, NULL, SIGCONT));
waitid (P_PID, pid, &siginfo, WSTOPPED | WNOWAIT);
/* ptrace might catch the SIGCONT emitted with PTRACE_CONT, catch it
and wait for the next event.
*/
if (siginfo.si_code == CLD_TRAPPED && siginfo.si_status == SIGCONT) {
assert0 (ptrace (PTRACE_CONT, pid, NULL, NULL));
waitid (P_PID, pid, &siginfo, WSTOPPED | WNOWAIT);
}
watch = nih_child_add_watch (NULL, pid, NIH_CHILD_TRAPPED,
my_handler, &watch);
TEST_FREE_TAG (watch);
handler_called = 0;
last_data = NULL;
last_pid = 0;
last_event = -1;
last_status = 0;
nih_child_poll ();
TEST_TRUE (handler_called);
TEST_EQ (last_pid, pid);
TEST_EQ (last_event, NIH_CHILD_TRAPPED);
TEST_EQ (last_status, SIGCHLD);
TEST_NOT_FREE (watch);
assert0 (ptrace (PTRACE_DETACH, pid, NULL, 0));
kill (pid, SIGTERM);
waitid (P_PID, pid, &siginfo, WEXITED);
nih_free (watch);
#if HAVE_VALGRIND_VALGRIND_H
/* These tests fail when running under valgrind.
*/
if (! RUNNING_ON_VALGRIND) {
#endif
/* Check that when a traced child forks it causes the reaper
* to be called with a ptrace event and the fork event in the
* status field. It should not be removed from the list since the
* child hasn't gone away.
*/
TEST_FEATURE ("with fork by traced child");
TEST_CHILD (pid) {
assert0 (ptrace (PTRACE_TRACEME, 0, NULL, NULL));
raise (SIGSTOP);
child = fork ();
assert (child >= 0);
pause ();
exit (0);
}
waitid (P_PID, pid, &siginfo, WSTOPPED);
assert0 (ptrace (PTRACE_SETOPTIONS, pid, NULL,
PTRACE_O_TRACESYSGOOD | PTRACE_O_TRACEFORK));
assert0 (ptrace (PTRACE_CONT, pid, NULL, SIGCONT));
/* Wait for ptrace to stop the parent (signalling the fork) */
waitid (P_PID, pid, &siginfo, WSTOPPED | WNOWAIT);
/* ptrace might catch the SIGCONT emitted with PTRACE_CONT, catch it
and wait for the next event.
*/
if (siginfo.si_code == CLD_TRAPPED && siginfo.si_status == SIGCONT) {
assert0 (ptrace (PTRACE_CONT, pid, NULL, NULL));
waitid (P_PID, pid, &siginfo, WSTOPPED | WNOWAIT);
}
/* Will be able to get the child pid now, we have to do it here
* because we want to wait on it to ensure the test is synchronous;
* otherwise nih_child_poll() could actually eat the child event
* before it returns -- normally we'd do this inside the handler,
* so things would probably work (we iter the handlers for each
* event, so you can add one).
*/
data = 0;
assert0 (ptrace (PTRACE_GETEVENTMSG, pid, NULL, &data));
assert (data != 0);
child = (pid_t)data;
/* Wait for ptrace to stop the child, otherwise it might not be
* ready for us to actually detach from.
*/
waitid (P_PID, child, &siginfo, WSTOPPED | WNOWAIT);
watch = nih_child_add_watch (NULL, pid, NIH_CHILD_PTRACE,
my_handler, &watch);
TEST_FREE_TAG (watch);
handler_called = 0;
last_data = NULL;
last_pid = 0;
last_event = -1;
last_status = 0;
nih_child_poll ();
TEST_TRUE (handler_called);
TEST_EQ (last_pid, pid);
TEST_EQ (last_event, NIH_CHILD_PTRACE);
TEST_EQ (last_status, PTRACE_EVENT_FORK);
TEST_NOT_FREE (watch);
assert0 (ptrace (PTRACE_DETACH, child, NULL, SIGCONT));
kill (child, SIGTERM);
assert0 (ptrace (PTRACE_DETACH, pid, NULL, SIGCONT));
kill (pid, SIGTERM);
waitid (P_PID, pid, &siginfo, WEXITED);
nih_free (watch);
/* Check that when a traced child execs it causes the reaper
* to be called with a ptrace event and the exec event in the
* status field. It should not be removed from the list since the
* child hasn't gone away.
*/
TEST_FEATURE ("with exec by traced child");
TEST_CHILD (pid) {
assert0 (ptrace (PTRACE_TRACEME, 0, NULL, NULL));
raise (SIGSTOP);
execl ("/bin/true", "true", NULL);
exit (255);
}
waitid (P_PID, pid, &siginfo, WSTOPPED);
assert0 (ptrace (PTRACE_SETOPTIONS, pid, NULL,
PTRACE_O_TRACESYSGOOD | PTRACE_O_TRACEEXEC));
assert0 (ptrace (PTRACE_CONT, pid, NULL, SIGCONT));
waitid (P_PID, pid, &siginfo, WSTOPPED | WNOWAIT);
/* ptrace might catch the SIGCONT emitted with PTRACE_CONT, catch it
and wait for the next event.
*/
if (siginfo.si_code == CLD_TRAPPED && siginfo.si_status == SIGCONT) {
assert0 (ptrace (PTRACE_CONT, pid, NULL, NULL));
waitid (P_PID, pid, &siginfo, WSTOPPED | WNOWAIT);
}
watch = nih_child_add_watch (NULL, pid, NIH_CHILD_PTRACE,
my_handler, &watch);
TEST_FREE_TAG (watch);
handler_called = 0;
last_data = NULL;
last_pid = 0;
last_event = -1;
last_status = 0;
nih_child_poll ();
TEST_TRUE (handler_called);
TEST_EQ (last_pid, pid);
TEST_EQ (last_event, NIH_CHILD_PTRACE);
TEST_EQ (last_status, PTRACE_EVENT_EXEC);
TEST_NOT_FREE (watch);
assert0 (ptrace (PTRACE_DETACH, pid, NULL, SIGCONT));
waitid (P_PID, pid, &siginfo, WEXITED);
nih_free (watch);
#if HAVE_VALGRIND_VALGRIND_H
}
#endif
/* Check that we can watch for events from any process, which
* shouldn't be freed when the child dies.
*/
TEST_FEATURE ("with generic watcher");
TEST_CHILD (pid) {
pause ();
}
watch = nih_child_add_watch (NULL, -1, NIH_CHILD_ALL,
my_handler, &watch);
TEST_FREE_TAG (watch);
handler_called = 0;
last_data = NULL;
last_pid = 0;
last_event = -1;
last_status = 0;
kill (pid, SIGTERM);
waitid (P_PID, pid, &siginfo, WEXITED | WNOWAIT);
nih_child_poll ();
TEST_TRUE (handler_called);
TEST_EQ (last_pid, pid);
TEST_EQ (last_event, NIH_CHILD_KILLED);
TEST_EQ (last_status, SIGTERM);
TEST_NOT_FREE (watch);
nih_free (watch);
/* Check that if we poll with an unknown pid, and no catch-all,
* nothing is triggered and the watch is not removed.
*/
TEST_FEATURE ("with pid-specific watcher and wrong pid");
TEST_CHILD (pid) {
pause ();
}
watch = nih_child_add_watch (NULL, pid - 1, NIH_CHILD_ALL,
my_handler, &watch);
TEST_FREE_TAG (watch);
handler_called = 0;
last_data = NULL;
last_pid = 0;
last_event = -1;
last_status = 0;
kill (pid, SIGTERM);
waitid (P_PID, pid, &siginfo, WEXITED | WNOWAIT);
nih_child_poll ();
TEST_FALSE (handler_called);
TEST_NOT_FREE (watch);
nih_free (watch);
/* Check that if we poll with a known pid but for a different event
* set, nothing is triggered and the watch is not removed.
*/
TEST_FEATURE ("with event-specific watcher and wrong event");
TEST_CHILD (pid) {
pause ();
}
watch = nih_child_add_watch (NULL, pid, NIH_CHILD_STOPPED,
my_handler, &watch);
TEST_FREE_TAG (watch);
handler_called = 0;
last_data = NULL;
last_pid = 0;
last_event = -1;
last_status = 0;
kill (pid, SIGTERM);
waitid (P_PID, pid, &siginfo, WEXITED | WNOWAIT);
nih_child_poll ();
TEST_FALSE (handler_called);
TEST_NOT_FREE (watch);
nih_free (watch);
/* Check that a poll when nothing has died does nothing. */
TEST_FEATURE ("with nothing dead");
TEST_CHILD (pid) {
pause ();
}
watch = nih_child_add_watch (NULL, -1, NIH_CHILD_ALL,
my_handler, &watch);
TEST_FREE_TAG (watch);
handler_called = 0;
nih_child_poll ();
TEST_FALSE (handler_called);
TEST_NOT_FREE (watch);
kill (pid, SIGTERM);
waitpid (pid, NULL, 0);
/* Check that a poll when there are no child processes does nothing */
TEST_FEATURE ("with no children");
handler_called = 0;
nih_child_poll ();
TEST_FALSE (handler_called);
TEST_NOT_FREE (watch);
nih_free (watch);
}
int
main (int argc,
char *argv[])
{
test_add_watch ();
test_poll ();
return 0;
}
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