int evl_poll(evl_t *evl, double timeout) {
int rv;
struct timeval timeout_tv;
struct timeval *timeoutp = NULL;
if (timeout != -1.0) {
timeout_tv.tv_sec = timeout;
timeout_tv.tv_usec = (timeout - timeout_tv.tv_sec) * 1000000 + 0.5;
timeoutp = &timeout_tv;
}
if (!(evl_common_get_fdset(evl->e, evl->r, evl_read) &&
evl_common_get_fdset(evl->e, evl->w, evl_write) &&
evl_common_get_fdset(evl->e, evl->x, evl_except))) return 0;
rv = select(evl_common_upper_bound(evl->e),
(fd_set*)evl->r->start,
(fd_set*)evl->w->start,
(fd_set*)evl->x->start,
timeoutp);
if (rv < 0 && errno == EINTR) {
return 1; /* pretend we succeeded and didn't time out */
} else if (rv < 0) { /* error in select */
return 0;
} else if (rv == 0) return 2; /* timeout */
else {
run_handlers(evl, evl_read);
run_handlers(evl, evl_write);
run_handlers(evl, evl_except);
return 1;
}
}
void run_handlers(int type, int code, int value, eventhandler *list) {
if (list != NULL) {
if ( type == list->type &&
code == list->code &&
value == list->value ) {
fprintf(stderr, "Executing handler: %s\n", list->cmdline);
int pid = fork();
if (pid == 0 ) {
system( list->cmdline );
exit(0);
}
}
/* traverse down the chain */
run_handlers(type, code, value, list->next);
}
}
