void FProcState::Wait()
{
if (bHasBeenWaitedFor)
{
return; // we could try waitpid() another time, but why
}
for(;;) // infinite loop in case we get EINTR and have to repeat
{
siginfo_t SignalInfo;
if (waitid(P_PID, GetProcessId(), &SignalInfo, WEXITED))
{
if (errno != EINTR)
{
int ErrNo = errno;
UE_LOG(LogHAL, Fatal, TEXT("FLinuxPlatformProcess::WaitForProc: waitid for pid %d failed (errno=%d, %s)"),
static_cast< int32 >(GetProcessId()), ErrNo, ANSI_TO_TCHAR(strerror(ErrNo)));
break; // exit the loop if for some reason Fatal log (above) returns
}
}
else
{
check(SignalInfo.si_pid == GetProcessId());
ReturnCode = (SignalInfo.si_code == CLD_EXITED) ? SignalInfo.si_status : -1;
bHasBeenWaitedFor = true;
bIsRunning = false; // set in advance
break;
}
}
}
// Block until child_pid exits, then exit. Try to preserve the exit code.
static void WaitForChildAndExit(pid_t child_pid) {
int exit_code = -1;
siginfo_t reaped_child_info;
// Don't "Core" on SIGABRT. SIGABRT is sent by the Chrome OS session manager
// when things are hanging.
// Here, the current process is going to waitid() and _exit(), so there is no
// point in generating a crash report. The child process is the one
// blocking us.
if (signal(SIGABRT, ExitWithErrorSignalHandler) == SIG_ERR) {
FatalError("Failed to change signal handler");
}
int wait_ret =
HANDLE_EINTR(waitid(P_PID, child_pid, &reaped_child_info, WEXITED));
if (!wait_ret && reaped_child_info.si_pid == child_pid) {
if (reaped_child_info.si_code == CLD_EXITED) {
exit_code = reaped_child_info.si_status;
} else {
// Exit with code 0 if the child got signaled.
exit_code = 0;
}
}
_exit(exit_code);
}
/*
* helper function to wait on process exit or background the job
*/
void queue_job(job_t *job) {
siginfo_t si;
if (job->bg) {
job->state = RUNNING;
job_add(&root, job);
} else {
fg = job;
si.si_pid = 0;
waitid(P_PID, job->pid, &si, WEXITED|WSTOPPED);
tcsetpgrp(0, s_pgid);
if (si.si_pid != 0) {
switch (si.si_code) {
case CLD_EXITED:
job_rm(&root, fg);
job_free(&fg);
break;
case CLD_STOPPED:
job->state = STOPPED;
job_add(&root, fg);
fg = NULL;
break;
}
}
}
}
void
event_child_signal(int sig_num)
{
siginfo_t siginfo;
int retval;
Event *event;
SList *list;
siginfo.si_pid = 0;
retval = waitid(P_ALL, 0, &siginfo, WEXITED | WNOHANG);
if (pikrellcam.verbose)
printf("child exit: ret=%d pid=%d %m\n", retval, siginfo.si_pid);
pthread_mutex_lock(&event_mutex);
for (list = event_list; list; list = list->next)
{
event = (Event *) list->data;
if (event->child_pid == siginfo.si_pid)
{
event->time = pikrellcam.t_now;
break;
}
}
pthread_mutex_unlock(&event_mutex);
}
void kill_childs()
{
siginfo_t info;
struct web_client *w;
for(w = web_clients; w ; w = w->next) {
debug(D_EXIT, "Stopping web client %s", w->client_ip);
pthread_cancel(w->thread);
pthread_join(w->thread, NULL);
}
int i;
for (i = 0; static_threads[i].name != NULL ; i++) {
if(static_threads[i].thread) {
debug(D_EXIT, "Stopping %s thread", static_threads[i].name);
pthread_cancel(*static_threads[i].thread);
pthread_join(*static_threads[i].thread, NULL);
static_threads[i].thread = NULL;
}
}
if(tc_child_pid) {
info("Killing tc-qos-helper procees");
if(killpid(tc_child_pid, SIGTERM) != -1)
waitid(P_PID, (id_t) tc_child_pid, &info, WEXITED);
}
tc_child_pid = 0;
struct plugind *cd;
for(cd = pluginsd_root ; cd ; cd = cd->next) {
debug(D_EXIT, "Stopping %s plugin thread", cd->id);
pthread_cancel(cd->thread);
pthread_join(cd->thread, NULL);
if(cd->pid && !cd->obsolete) {
debug(D_EXIT, "killing %s plugin process", cd->id);
if(killpid(cd->pid, SIGTERM) != -1)
waitid(P_PID, (id_t) cd->pid, &info, WEXITED);
}
}
// if, for any reason there is any child exited
// catch it here
waitid(P_PID, 0, &info, WEXITED|WNOHANG);
debug(D_EXIT, "All threads/childs stopped.");
}
static bool ReapOneProcess() {
siginfo_t siginfo = {};
// This returns a zombie pid or informs us that there are no zombies left to be reaped.
// It does NOT reap the pid; that is done below.
if (TEMP_FAILURE_RETRY(waitid(P_ALL, 0, &siginfo, WEXITED | WNOHANG | WNOWAIT)) != 0) {
PLOG(ERROR) << "waitid failed";
return false;
}
auto pid = siginfo.si_pid;
if (pid == 0) return false;
// At this point we know we have a zombie pid, so we use this scopeguard to reap the pid
// whenever the function returns from this point forward.
// We do NOT want to reap the zombie earlier as in Service::Reap(), we kill(-pid, ...) and we
// want the pid to remain valid throughout that (and potentially future) usages.
auto reaper = make_scope_guard([pid] { TEMP_FAILURE_RETRY(waitpid(pid, nullptr, WNOHANG)); });
std::string name;
std::string wait_string;
Service* service = nullptr;
if (PropertyChildReap(pid)) {
name = "Async property child";
} else if (SubcontextChildReap(pid)) {
name = "Subcontext";
} else {
service = ServiceList::GetInstance().FindService(pid, &Service::pid);
if (service) {
name = StringPrintf("Service '%s' (pid %d)", service->name().c_str(), pid);
if (service->flags() & SVC_EXEC) {
auto exec_duration = boot_clock::now() - service->time_started();
auto exec_duration_ms =
std::chrono::duration_cast<std::chrono::milliseconds>(exec_duration).count();
wait_string = StringPrintf(" waiting took %f seconds", exec_duration_ms / 1000.0f);
}
} else {
name = StringPrintf("Untracked pid %d", pid);
}
}
auto status = siginfo.si_status;
if (WIFEXITED(status)) {
LOG(INFO) << name << " exited with status " << WEXITSTATUS(status) << wait_string;
} else if (WIFSIGNALED(status)) {
LOG(INFO) << name << " killed by signal " << WTERMSIG(status) << wait_string;
}
if (!service) return true;
service->Reap();
if (service->flags() & SVC_TEMPORARY) {
ServiceList::GetInstance().RemoveService(*service);
}
return true;
}
/*
* stress_wait
* stress wait*() family of calls
*/
int stress_wait(
uint64_t *const counter,
const uint32_t instance,
const uint64_t max_ops,
const char *name)
{
int status, ret = EXIT_SUCCESS;
pid_t pid_r, pid_k;
(void)instance;
pr_dbg(stderr, "%s: waiter started [%d]\n",
name, getpid());
pid_r = spawn(name, runner, 0, counter, max_ops);
if (pid_r < 0) {
pr_fail_dbg(name, "fork");
exit(EXIT_FAILURE);
}
pid_k = spawn(name, killer, pid_r, counter, max_ops);
if (pid_k < 0) {
pr_fail_dbg(name, "fork");
ret = EXIT_FAILURE;
goto tidy;
}
do {
(void)waitpid(pid_r, &status, WCONTINUED);
if (!opt_do_run)
break;
if (WIFCONTINUED(status))
(*counter)++;
#if _SVID_SOURCE || _XOPEN_SOURCE >= 500 || \
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || \
_POSIX_C_SOURCE >= 200809L
{
siginfo_t info;
(void)waitid(P_PID, pid_r, &info, WCONTINUED);
if (!opt_do_run)
break;
if (WIFCONTINUED(status))
(*counter)++;
}
#endif
} while (opt_do_run && (!max_ops || *counter < max_ops));
(void)kill(pid_k, SIGKILL);
(void)waitpid(pid_k, &status, 0);
tidy:
(void)kill(pid_r, SIGKILL);
(void)waitpid(pid_r, &status, 0);
return ret;
}
static void wait_until_process_exited(pid_t pid, siginfo_t *si)
{
siginfo_t ignored_si;
if (NULL == si) {
si = &ignored_si;
}
memset(si, 0, sizeof(*si));
TRACE_ASSERT(0 == TEMP_FAILURE_RETRY(waitid(P_PID, pid, si, WEXITED)));
}
static void _handle_sig_child(void) {
siginfo_t info;
memset(&info, 0, sizeof(info));
if (0 > waitid(P_ALL, 0, &info, WEXITED | WNOWAIT | WNOHANG))
return LOGGER_PERROR("waitid");
if (info.si_pid > 0) {
LOGGER_ERROR("child process [%d] terminated unexpectedly: %s, status=%d", info.si_pid, _get_exit_reason(&info), info.si_status);
epoll_worker_exit();
}
}
pid_t
_waitpid(pid_t pid, int *stat_loc, int options)
{
idtype_t idtype;
id_t id;
siginfo_t info;
int error;
if (pid > 0) {
idtype = P_PID;
id = pid;
} else if (pid < -1) {
idtype = P_PGID;
id = -pid;
} else if (pid == -1) {
idtype = P_ALL;
id = 0;
} else {
idtype = P_PGID;
id = getpgid(0);
}
options |= (WEXITED|WTRAPPED);
if ((error = waitid(idtype, id, &info, options)) < 0)
return (error);
if (stat_loc) {
int stat = (info.si_status & 0377);
switch (info.si_code) {
case CLD_EXITED:
stat <<= 8;
break;
case CLD_DUMPED:
stat |= WCOREFLG;
break;
case CLD_KILLED:
break;
case CLD_TRAPPED:
case CLD_STOPPED:
stat <<= 8;
stat |= WSTOPFLG;
break;
case CLD_CONTINUED:
stat = WCONTFLG;
break;
}
*stat_loc = stat;
}
return (info.si_pid);
}
static siginfo_t wait_trap(pid_t chld)
{
siginfo_t si;
if (waitid(P_PID, chld, &si, WEXITED|WSTOPPED) != 0)
err(1, "waitid");
if (si.si_pid != chld)
errx(1, "got unexpected pid in event\n");
if (si.si_code != CLD_TRAPPED)
errx(1, "got unexpected event type %d\n", si.si_code);
return si;
}
static int
exec_and_report_test(const struct weston_test *t, void *test_data, int iteration)
{
int success = 0;
int skip = 0;
int hardfail = 0;
siginfo_t info;
pid_t pid = fork();
assert(pid >= 0);
if (pid == 0)
run_test(t, test_data); /* never returns */
if (waitid(P_ALL, 0, &info, WEXITED)) {
fprintf(stderr, "waitid failed: %m\n");
abort();
}
if (test_data)
fprintf(stderr, "test \"%s/%i\":\t", t->name, iteration);
else
fprintf(stderr, "test \"%s\":\t", t->name);
switch (info.si_code) {
case CLD_EXITED:
fprintf(stderr, "exit status %d", info.si_status);
if (info.si_status == EXIT_SUCCESS)
success = 1;
else if (info.si_status == SKIP)
skip = 1;
break;
case CLD_KILLED:
case CLD_DUMPED:
fprintf(stderr, "signal %d", info.si_status);
if (info.si_status != SIGABRT)
hardfail = 1;
break;
}
if (t->must_fail)
success = !success;
if (success && !hardfail) {
fprintf(stderr, ", pass.\n");
return 1;
} else if (skip) {
fprintf(stderr, ", skip.\n");
return SKIP;
} else {
fprintf(stderr, ", fail.\n");
return 0;
}
}
int
waitsys(idtype_t idtype, id_t id, siginfo_t *infop, int options)
{
int error;
k_siginfo_t info;
if (error = waitid(idtype, id, &info, options))
return (set_errno(error));
if (copyout(&info, infop, sizeof (k_siginfo_t)))
return (set_errno(EFAULT));
return (0);
}
ATF_TC_BODY(waitid_options, tc)
{
size_t i = 0;
int o;
while((o = get_options6(i++)) != -1) {
printf("Testing waitid(2) with options %x\n", o);
ATF_REQUIRE_ERRNO(ECHILD,
waitid(P_ALL, 0, NULL, o | TWAIT_OPTION) == -1);
}
}
void
impl_exit_check(void)
{
if( is_exiting == TRUE && total_tracked == 0 )
{
if( wait_mode == TRUE )
{
/* Check for any active child processes.
* NOTE: Because we are using waitid() here, and
* that allows us to specify WNOWAIT, the child
* will stay in a waitable state for to be reaped
* whenever the actual program wants to. */
do {
siginfo_t info;
int rval = waitid(P_ALL, 0, &info, WNOHANG|WNOWAIT);
if( rval < 0 && errno == EINTR )
{
continue;
}
if( rval >= 0 || (rval < 0 && errno != ECHILD) )
{
/* There are still active child processes. */
return;
}
break;
} while( 1 );
}
DEBUG("No active connections, finishing exit.");
switch( exit_strategy )
{
case FORK:
/* We're done.
* No more connections are active, and there's
* presumably already a child process handling
* new incoming connections. */
DEBUG("Goodbye!");
libc.exit(0);
break;
case EXEC:
/* Let's do the exec.
* We're wrapped up existing connections, we can
* re-execute the application to start handling new
* incoming connections. */
DEBUG("See you soon...");
impl_exec();
break;
}
}
}
int
main(void)
{
pid_t pid;
int a = 1;
siginfo_t infop;
if ((pid = fork()) < 0) {
err_msg("fork error\n");
} else if (0 == pid) {
exit(7);
}
if (waitid(P_PID, pid, &infop, WEXITED) < 0) {
err_msg("waitid error\n");
}
pr_exit(infop);
if ((pid = fork()) < 0) {
err_msg("fork error\n");
} else if (0 == pid) {
abort();
}
if (waitid(P_PID, pid, &infop, WEXITED) < 0) {
err_msg("waitid error\n");
}
pr_exit(infop);
if ((pid = fork()) < 0) {
err_msg("fork error\n");
} else if (0 == pid) {
a /= 0;
}
if (waitid(P_PID, pid, &infop, WEXITED) < 0) {
err_msg("waitid error\n");
}
pr_exit(infop);
exit(0);
}
static int signal_handler(int fd, uint32_t events, void *data,
struct lxc_epoll_descr *descr)
{
struct signalfd_siginfo siginfo;
siginfo_t info;
int ret;
pid_t *pid = data;
bool init_died = false;
ret = read(fd, &siginfo, sizeof(siginfo));
if (ret < 0) {
ERROR("Failed to read signal info from signal file descriptor: %d.", fd);
return -1;
}
if (ret != sizeof(siginfo)) {
ERROR("Unexpected size for siginfo struct.");
return -1;
}
/* Check whether init is running. */
info.si_pid = 0;
ret = waitid(P_PID, *pid, &info, WEXITED | WNOWAIT | WNOHANG);
if (ret == 0 && info.si_pid == *pid)
init_died = true;
if (siginfo.ssi_signo != SIGCHLD) {
kill(*pid, siginfo.ssi_signo);
INFO("Forwarded signal %d to pid %d.", siginfo.ssi_signo, *pid);
return init_died ? 1 : 0;
}
if (siginfo.ssi_code == CLD_STOPPED) {
INFO("Container init process was stopped.");
return init_died ? 1 : 0;
} else if (siginfo.ssi_code == CLD_CONTINUED) {
INFO("Container init process was continued.");
return init_died ? 1 : 0;
}
/* More robustness, protect ourself from a SIGCHLD sent
* by a process different from the container init.
*/
if (siginfo.ssi_pid != *pid) {
WARN("Invalid pid for SIGCHLD. Received pid %d, expected pid %d.", siginfo.ssi_pid, *pid);
return init_died ? 1 : 0;
}
DEBUG("Container init process %d exited.", *pid);
return 1;
}
int
waitsys32(idtype_t idtype, id_t id, siginfo_t *infop, int options)
{
int error;
k_siginfo_t info;
siginfo32_t info32;
if (error = waitid(idtype, id, &info, options))
return (set_errno(error));
siginfo_kto32(&info, &info32);
if (copyout(&info32, infop, sizeof (info32)))
return (set_errno(EFAULT));
return (0);
}
static int signal_handler(int fd, uint32_t events, void *data,
struct lxc_epoll_descr *descr)
{
struct signalfd_siginfo siginfo;
siginfo_t info;
int ret;
pid_t *pid = data;
bool init_died = false;
ret = read(fd, &siginfo, sizeof(siginfo));
if (ret < 0) {
ERROR("failed to read signal info");
return -1;
}
if (ret != sizeof(siginfo)) {
ERROR("unexpected siginfo size");
return -1;
}
// check whether init is running
info.si_pid = 0;
ret = waitid(P_PID, *pid, &info, WEXITED | WNOWAIT | WNOHANG);
if (ret == 0 && info.si_pid == *pid) {
init_died = true;
}
if (siginfo.ssi_signo != SIGCHLD) {
kill(*pid, siginfo.ssi_signo);
INFO("forwarded signal %d to pid %d", siginfo.ssi_signo, *pid);
return init_died ? 1 : 0;
}
if (siginfo.ssi_code == CLD_STOPPED ||
siginfo.ssi_code == CLD_CONTINUED) {
INFO("container init process was stopped/continued");
return init_died ? 1 : 0;
}
/* more robustness, protect ourself from a SIGCHLD sent
* by a process different from the container init
*/
if (siginfo.ssi_pid != *pid) {
WARN("invalid pid for SIGCHLD");
return init_died ? 1 : 0;
}
DEBUG("container init process exited");
return 1;
}
bool
app_launcher::update_status(bool wait)
{
if (m_status_code != STATUS_RUNNING)
return false;
assert(m_child_pid >= 0);
int options = WEXITED; // WSTOPPED: wait for children stopped by delivery of signal.
if(!wait)
options |= WNOHANG;
siginfo_t signalinfo;
int ret = waitid(P_PID, m_child_pid, &signalinfo, options);
if (ret == -1)
{
m_status_code = STATUS_ERROR;
m_status = ret;
assert(0);
return false;
}
else
{
// If we ever care about signals and whatnot:
// signalinfo.si_signo; // Signal number.
// signalinfo.si_code; // Signal code: CLD_EXITED, CLD_DUMPED, CLD_KILLED.
// signalinfo.si_errno; // Error number associated with signal.
// signalinfo.si_status; // Exit value.
switch(signalinfo.si_code)
{
default:
assert(0);
case CLD_EXITED:
m_status_code = STATUS_EXITED;
m_status = signalinfo.si_status;
break;
case CLD_KILLED:
m_status_code = STATUS_KILLED;
m_status = 0;
break;
case CLD_DUMPED:
m_status_code = STATUS_DUMPED;
m_status = 0;
break;
}
}
return true;
}
int wait_for_child(int options) {
id_t id_ignored = 0;
siginfo_t infop;
infop.si_pid = 0;
waitid(P_ALL, id_ignored, &infop, WEXITED | options);
if (infop.si_pid == 0) {
return -1; /* Nothing to wait for */
}
if (infop.si_code == CLD_EXITED) {
return infop.si_status;
}
return 1;
}
bool FProcState::IsRunning()
{
if (bIsRunning)
{
check(!bHasBeenWaitedFor); // check for the sake of internal consistency
// check if actually running
int KillResult = kill(GetProcessId(), 0); // no actual signal is sent
check(KillResult != -1 || errno != EINVAL);
bIsRunning = (KillResult == 0 || (KillResult == -1 && errno == EPERM));
// additional check if it's a zombie
if (bIsRunning)
{
for(;;) // infinite loop in case we get EINTR and have to repeat
{
siginfo_t SignalInfo;
SignalInfo.si_pid = 0; // if remains 0, treat as child was not waitable (i.e. was running)
if (waitid(P_PID, GetProcessId(), &SignalInfo, WEXITED | WNOHANG | WNOWAIT))
{
if (errno != EINTR)
{
int ErrNo = errno;
UE_LOG(LogHAL, Fatal, TEXT("FLinuxPlatformProcess::WaitForProc: waitid for pid %d failed (errno=%d, %s)"),
static_cast< int32 >(GetProcessId()), ErrNo, ANSI_TO_TCHAR(strerror(ErrNo)));
break; // exit the loop if for some reason Fatal log (above) returns
}
}
else
{
bIsRunning = ( SignalInfo.si_pid != GetProcessId() );
break;
}
}
}
// If child is a zombie, wait() immediately to free up kernel resources. Higher level code
// (e.g. shader compiling manager) can hold on to handle of no longer running process for longer,
// which is a dubious, but valid behavior. We don't want to keep zombie around though.
if (!bIsRunning)
{
UE_LOG(LogHAL, Log, TEXT("Child %d is no more running (zombie), Wait()ing immediately."), GetProcessId() );
Wait();
}
}
return bIsRunning;
}
/*Checa se ha job terminado no ultimo contexto, imprimindo e liberando espaco*/
void checkjob(){
siginfo_t signal;
int i;
for(i = 1; i < MAX_JOBS ; i++) {
signal.si_pid = 0;
if (!(!waitid(P_PID ,jobs[i].p_id, &signal, WNOHANG | WEXITED)) && signal.si_pid == 0){
if (jobs[i].flag != 0){
printf("[%d]\t", i);
printf("Terminado\t");
printf("%s \n",jobs[i].p_name);
jobs[i].flag = 0;
}
}
}
}
/*Imprime jobs em background*/
void imprimejob(){
siginfo_t signal;
int i;
for(i = 1; i < MAX_JOBS ; i++) {
if ((jobs[i].flag == 0) || (jobs[i].flag == 2)) continue;
signal.si_pid = 0;
if ((!waitid(P_PID ,jobs[i].p_id, &signal, WNOHANG | WEXITED)) && signal.si_pid == 0){
if (jobs[i].flag !=3) jobs[i].flag = 1;
printf("[%d]\t", jobs[i].p_id);
printf("%%%d\t", jobs[i].j_id);
printf("%s\t", jobs[i].p_status);
printf("%s &\n",jobs[i].p_name);
}
else jobs[i].flag = 2;
}
}
void child_t::sigchld_handler(int sig) {
siginfo_t siginfo;
char line[MAX_PACKETLEN]={0};
fprintf(stderr, "parent: received signal %d.\n", sig);
siginfo.si_pid=0; // get wait info
if ( waitid(P_ALL, 0, &siginfo, WEXITED | WSTOPPED | WCONTINUED | WNOHANG) < 0 ) {
perror("wait failed");
}
if ( siginfo.si_pid == 0 ) {
printf("warning: wait returned siginfo.si_pid==0.\n");
return;
}
child_t* child = child_t::findbyPID(siginfo.si_pid); // find corresponding child
if ( child == NULL ) {
printf("warning: received SIGCHLD from (pid %d), which is no child!\n", siginfo.si_pid);
child_t::ListChildren();
return;
}
// update child status
child->status = siginfo.si_code;
child->pid = (pid_t)-1;
line[0]=0; // clear line // compose info message
lineadd(line, "%s > status=%s", child->clientid, child->ChildStatusString() );
//lineadd(line, "FIXME > status=%s", child->ChildStatusString() ); // FIXME: no clientid here
lineadd(line, ", pid=%d", siginfo.si_pid);
lineadd(line, ", uid=%d", siginfo.si_uid);
if (WIFSIGNALED(siginfo.si_status)) {
lineadd(line, ", termsig=%d", WTERMSIG(siginfo.si_status));
# ifdef WCOREDUMP
lineadd(line, ", coredump=%s", WCOREDUMP(siginfo.si_status)?"true":"false");
# endif
}
if (WIFSTOPPED(siginfo.si_status) ) {
lineadd(line, ", stopsig=%d", WSTOPSIG(siginfo.si_status));
}
if (WIFEXITED(siginfo.si_status) ) {
lineadd(line, ", return_status=%d", WEXITSTATUS(siginfo.si_status));
}
if ( meptr != NULL ) {
(meptr)->printf("%ld %s\n", time(NULL), line);
} else {
printf("%s\n", line);
}
}
// Block until child_pid exits, then exit. Try to preserve the exit code.
static void WaitForChildAndExit(pid_t child_pid) {
int exit_code = -1;
siginfo_t reaped_child_info;
int wait_ret =
HANDLE_EINTR(waitid(P_PID, child_pid, &reaped_child_info, WEXITED));
if (!wait_ret && reaped_child_info.si_pid == child_pid) {
if (reaped_child_info.si_code == CLD_EXITED) {
exit_code = reaped_child_info.si_status;
} else {
// Exit with code 0 if the child got signaled.
exit_code = 0;
}
}
_exit(exit_code);
}
/** Starts the web100srv process. Either args must be NULL or the last element
* of **args must be NULL. */
pid_t start_server(int port, char **extra_args) {
int extra_args_index = 0;
char *arg;
pid_t server_pid;
siginfo_t server_status;
char port_string[6]; // 32767 is the max port, so must hold 5 digits + \0
int rv;
char *args_for_exec[256] = {"./web100srv", "--snaplog", "--tcpdump",
"--cputime", "--log_dir", "/tmp", "-l", LOGFILE_TEMPLATE, "--port", NULL};
int exec_args_index = 0;
// set exec_args_index to the first index of args_for_exec that is NULL
while (args_for_exec[exec_args_index] != NULL) {
// along the way, fill in the template for the test logs
if (strcmp(args_for_exec[exec_args_index], LOGFILE_TEMPLATE) == 0) {
mkstemp(args_for_exec[exec_args_index]);
}
exec_args_index++;
}
log_println(1, "Starting the server");
if ((server_pid = fork()) == 0) {
sprintf(port_string, "%d", port);
args_for_exec[exec_args_index++] = port_string;
while (extra_args != NULL && extra_args[extra_args_index] != NULL) {
CHECK((args_for_exec[exec_args_index++] =
strdup(extra_args[extra_args_index++])) != NULL);
}
args_for_exec[exec_args_index++] = NULL;
execv("./web100srv", args_for_exec);
perror("SERVER START ERROR: SHOULD NEVER HAPPEN");
FAIL("The server should never return - it should only be killed.");
exit(1);
}
// Wait until the server port (hopefully) becomes available. The server PID is
// available immediately, but we need to make sure to lose the race condition
// with the server startup process, so that the NDT port is open and ready to
// receive traffic and we won't begin the test before the server's startup
// routines are complete.
sleep(1);
// Double-check that the server didn't crash on startup.
server_status.si_pid = 0;
rv = waitid(P_PID, server_pid, &server_status, WEXITED | WSTOPPED | WNOHANG);
ASSERT(rv == 0 && server_status.si_pid == 0,
"The server did not start successfully (exit code %d)", rv);
return server_pid;
}
int
main(void)
{
void *buf;
pid_t child;
int ret, i;
siginfo_t info;
uint8_t *ubuf;
size_t mapsz = sysconf(_SC_PAGESIZE) * 2;
buf = mmap(NULL, mapsz, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
assert(buf != MAP_FAILED);
ret = memcntl(buf, mapsz, MC_INHERIT_ZERO, 0, 0, 0);
assert(ret == 0);
again:
memset(buf, 'a' + nchild, mapsz);
child = fork();
if (child == 0) {
nchild--;
for (i = 0, ubuf = buf; i < mapsz; i++)
assert(ubuf[i] == 0);
if (nchild != 0)
goto again;
exit(0);
}
assert(child != -1);
do {
ret = waitid(P_PID, child, &info, WEXITED);
} while (ret == -1 && errno == EINTR);
assert(ret == 0);
assert(info.si_pid == child);
assert(info.si_status == 0);
for (i = 0, ubuf = buf; i < mapsz; i++)
assert(ubuf[i] == 'a' + nchild);
return (0);
}
static int manager_signal_fn(sd_event_source *source,
const struct signalfd_siginfo *ssi,
void *data)
{
struct manager *m = data;
if (ssi->ssi_signo == SIGCHLD) {
log_debug("caught SIGCHLD for %ld, reaping child", (long)ssi->ssi_pid);
waitid(P_PID, ssi->ssi_pid, NULL, WNOHANG|WEXITED);
return 0;
} else if (ssi->ssi_signo == SIGPIPE) {
/* ignore SIGPIPE */
return 0;
}
log_notice("caught signal %d, exiting..", (int)ssi->ssi_signo);
sd_event_exit(m->event, 0);
return 0;
}
int main(void) {
int i = 0;
pid_t pid;
int status;
siginfo_t si;
++i;
pid = fork();
if (!pid) {
usleep(100);
exit(i);
}
test_assert(pid == wait(&status));
atomic_printf("%d exited with status %#x\n", pid, status);
test_assert(WIFEXITED(status) && i == WEXITSTATUS(status));
++i;
pid = fork();
if (!pid) {
usleep(100);
exit(i);
}
test_assert(pid == waitpid(pid, &status, 0));
atomic_printf("%d exited with status %#x\n", pid, status);
test_assert(WIFEXITED(status) && i == WEXITSTATUS(status));
++i;
pid = fork();
if (!pid) {
usleep(100);
exit(i);
}
test_assert(0 == waitid(P_PID, pid, &si, WEXITED | WSTOPPED));
atomic_printf("%d exited with exit-type %d; code %d\n", si.si_pid, si.si_code,
si.si_status);
test_assert(SIGCHLD == si.si_signo && CLD_EXITED == si.si_code);
test_assert(pid == si.si_pid && i == si.si_status);
atomic_puts("EXIT-SUCCESS");
return 0;
}
