/** Helper: Put <b>entry</b> into map of directory requests using
* <b>type</b> and <b>dirreq_id</b> as key parts. If there is
* already an entry for that key, print out a BUG warning and return. */
static void
dirreq_map_put_(dirreq_map_entry_t *entry, dirreq_type_t type,
uint64_t dirreq_id)
{
dirreq_map_entry_t *old_ent;
tor_assert(entry->type == type);
tor_assert(entry->dirreq_id == dirreq_id);
/* XXXX we could switch this to HT_INSERT some time, since it seems that
* this bug doesn't happen. But since this function doesn't seem to be
* critical-path, it's sane to leave it alone. */
old_ent = HT_REPLACE(dirreqmap, &dirreq_map, entry);
if (old_ent && old_ent != entry) {
log_warn(LD_BUG, "Error when putting directory request into local "
"map. There was already an entry for the same identifier.");
return;
}
}
/**
* Begin monitoring the child pid <b>pid</b> to see if we get a SIGCHLD for
* it. If we eventually do, call <b>fn</b>, passing it the exit status (as
* yielded by waitpid) and the pointer <b>arg</b>.
*
* To cancel this, or clean up after it has triggered, call
* clear_waitpid_callback().
*/
waitpid_callback_t *
set_waitpid_callback(pid_t pid, void (*fn)(int, void *), void *arg)
{
waitpid_callback_t *old_ent;
waitpid_callback_t *ent = tor_malloc_zero(sizeof(waitpid_callback_t));
ent->pid = pid;
ent->userfn = fn;
ent->userdata = arg;
ent->running = 1;
old_ent = HT_REPLACE(process_map, &process_map, ent);
if (old_ent) {
log_warn(LD_BUG, "Replaced a waitpid monitor on pid %u. That should be "
"impossible.", (unsigned) pid);
old_ent->running = 0;
}
return ent;
}
