void *probe_signal_handler(void *arg)
{
probe_t *probe = (probe_t *)arg;
siginfo_t siinf;
sigset_t siset;
#if defined(HAVE_PTHREAD_SETNAME_NP)
# if defined(__APPLE__)
pthread_setname_np("signal_handler");
# else
pthread_setname_np(pthread_self(), "signal_handler");
# endif
#endif
sigemptyset(&siset);
sigaddset(&siset, SIGHUP);
sigaddset(&siset, SIGUSR1);
sigaddset(&siset, SIGUSR2);
sigaddset(&siset, SIGINT);
sigaddset(&siset, SIGTERM);
sigaddset(&siset, SIGQUIT);
sigaddset(&siset, SIGPIPE);
#if defined(__linux__)
if (prctl(PR_SET_PDEATHSIG, SIGTERM) != 0)
dW("prctl(PR_SET_PDEATHSIG, SIGTERM) failed");
#endif
dD("Signal handler ready");
switch (errno = pthread_barrier_wait(&OSCAP_GSYM(th_barrier)))
{
case 0:
case PTHREAD_BARRIER_SERIAL_THREAD:
break;
default:
dE("pthread_barrier_wait: %d, %s.", errno, strerror(errno));
return (NULL);
}
while (sigwaitinfo(&siset, &siinf) != -1) {
dD("Received signal %d from %u (%s)",
siinf.si_signo, (unsigned int)siinf.si_pid,
getppid() == siinf.si_pid ? "parent" : "not my parent");
#if defined(PROBE_SIGNAL_PARENTONLY)
/* Listen only to signals sent from the parent process */
if (getppid() != siinf.si_pid)
continue;
#endif
switch(siinf.si_signo) {
case SIGUSR1:/* probe abort */
probe->probe_exitcode = ECONNABORTED;
/* FALLTHROUGH */
case SIGINT:
case SIGTERM:
case SIGQUIT:
case SIGPIPE:
{
__thr_collection coll;
coll.thr = NULL;
coll.cnt = 0;
pthread_cancel(probe->th_input);
/* collect IDs and cancel threads */
rbt_walk_inorder2(probe->workers, __abort_cb, &coll, 0);
/*
* Wait till all threads are canceled (they may temporarily disable
* cancelability), but at most 60 seconds per thread.
*/
for (; coll.cnt > 0; --coll.cnt) {
probe_worker_t *thr = coll.thr[coll.cnt - 1];
#if defined(HAVE_PTHREAD_TIMEDJOIN_NP) && defined(HAVE_CLOCK_GETTIME)
struct timespec j_tm;
if (clock_gettime(CLOCK_REALTIME, &j_tm) == -1) {
dE("clock_gettime(CLOCK_REALTIME): %d, %s.", errno, strerror(errno));
continue;
}
j_tm.tv_sec += 60;
if ((errno = pthread_timedjoin_np(thr->tid, NULL, &j_tm)) != 0) {
dE("[%llu] pthread_timedjoin_np: %d, %s.", (uint64_t)thr->sid, errno, strerror(errno));
/*
* Memory will be leaked here by continuing to the next thread. However, we are in the
* process of shutting down the whole probe. We're just nice and gave the probe_main()
* thread a chance to finish it's critical section which shouldn't take that long...
*/
continue;
}
#else
if ((errno = pthread_join(thr->tid, NULL)) != 0) {
dE("pthread_join: %d, %s.", errno, strerror(errno));
continue;
}
#endif
SEAP_msg_free(coll.thr[coll.cnt - 1]->msg);
oscap_free(coll.thr[coll.cnt - 1]);
}
oscap_free(coll.thr);
goto exitloop;
}
case SIGUSR2:
case SIGHUP:
/* ignore */
break;
}
}
exitloop:
return (NULL);
}
void *probe_worker_runfn(void *arg)
{
probe_pwpair_t *pair = (probe_pwpair_t *)arg;
SEXP_t *probe_res, *obj, *oid;
int probe_ret;
#if defined(HAVE_PTHREAD_SETNAME_NP)
pthread_setname_np(pthread_self(), "probe_worker");
#endif
dD("handling SEAP message ID %u", pair->pth->sid);
//
probe_ret = -1;
probe_res = pair->pth->msg_handler(pair->probe, pair->pth->msg, &probe_ret);
//
dD("handler result = %p, return code = %d", probe_res, probe_ret);
/* Assuming that the red-black tree API is doing locking for us... */
if (rbt_i32_del(pair->probe->workers, pair->pth->sid, NULL) != 0) {
dW("thread not found in the probe thread tree, probably canceled by an external signal");
/*
* XXX: this is a possible deadlock; we can't send anything from
* here because the signal handler replied to the message
*/
arg = NULL;
SEAP_msg_free(pair->pth->msg);
SEXP_free(probe_res);
oscap_free(pair);
return (NULL);
} else {
SEXP_t *items;
dD("probe thread deleted");
obj = SEAP_msg_get(pair->pth->msg);
oid = probe_obj_getattrval(obj, "id");
items = probe_cobj_get_items(probe_res);
if (items != NULL) {
SEXP_list_sort(items, SEXP_refcmp);
SEXP_free(items);
}
if (probe_rcache_sexp_add(pair->probe->rcache, oid, probe_res) != 0) {
/* TODO */
abort();
}
SEXP_vfree(obj, oid, NULL);
}
if (probe_ret != 0) {
/*
* Something bad happened. A hint of the cause is stored as a error code in
* probe_ret (should be). We'll send it to the library using a SEAP error packet.
*/
if (SEAP_replyerr(pair->probe->SEAP_ctx, pair->probe->sd, pair->pth->msg, probe_ret) == -1) {
int ret = errno;
dE("An error ocured while sending error status. errno=%u, %s.", errno, strerror(errno));
SEXP_free(probe_res);
/* FIXME */
exit(ret);
}
SEXP_free(probe_res);
} else {
SEAP_msg_t *seap_reply;
/*
* OK, the probe actually returned something, let's send it to the library.
*/
seap_reply = SEAP_msg_new();
SEAP_msg_set(seap_reply, probe_res);
if (SEAP_reply(pair->probe->SEAP_ctx, pair->probe->sd, seap_reply, pair->pth->msg) == -1) {
int ret = errno;
SEAP_msg_free(seap_reply);
SEXP_free(probe_res);
exit(ret);
}
SEAP_msg_free(seap_reply);
SEXP_free(probe_res);
}
SEAP_msg_free(pair->pth->msg);
oscap_free(pair->pth);
oscap_free(pair);
pthread_detach(pthread_self());
return (NULL);
}
