/* * Event loop based on select() loop * Copyright (c) 2002-2009, Jouni Malinen * * This software may be distributed under the terms of the BSD license. * See README for more details. */ #include "includes.h" #include #include "common.h" #include "trace.h" #include "list.h" #include "eloop.h" #if defined(CONFIG_ELOOP_POLL) && defined(CONFIG_ELOOP_EPOLL) #error Do not define both of poll and epoll #endif #if !defined(CONFIG_ELOOP_POLL) && !defined(CONFIG_ELOOP_EPOLL) #define CONFIG_ELOOP_SELECT #endif #ifdef CONFIG_ELOOP_POLL #include #endif /* CONFIG_ELOOP_POLL */ #ifdef CONFIG_ELOOP_EPOLL #include #endif /* CONFIG_ELOOP_EPOLL */ struct eloop_sock { int sock; void *eloop_data; void *user_data; eloop_sock_handler handler; WPA_TRACE_REF(eloop); WPA_TRACE_REF(user); WPA_TRACE_INFO }; struct eloop_timeout { struct dl_list list; struct os_reltime time; void *eloop_data; void *user_data; eloop_timeout_handler handler; WPA_TRACE_REF(eloop); WPA_TRACE_REF(user); WPA_TRACE_INFO }; struct eloop_signal { int sig; void *user_data; eloop_signal_handler handler; int signaled; }; struct eloop_sock_table { int count; struct eloop_sock *table; #ifdef CONFIG_ELOOP_EPOLL eloop_event_type type; #else /* CONFIG_ELOOP_EPOLL */ int changed; #endif /* CONFIG_ELOOP_EPOLL */ }; struct eloop_data { int max_sock; int count; /* sum of all table counts */ #ifdef CONFIG_ELOOP_POLL int max_pollfd_map; /* number of pollfds_map currently allocated */ int max_poll_fds; /* number of pollfds currently allocated */ struct pollfd *pollfds; struct pollfd **pollfds_map; #endif /* CONFIG_ELOOP_POLL */ #ifdef CONFIG_ELOOP_EPOLL int epollfd; int epoll_max_event_num; int epoll_max_fd; struct eloop_sock *epoll_table; struct epoll_event *epoll_events; #endif /* CONFIG_ELOOP_EPOLL */ struct eloop_sock_table readers; struct eloop_sock_table writers; struct eloop_sock_table exceptions; struct dl_list timeout; int signal_count; struct eloop_signal *signals; int signaled; int pending_terminate; int terminate; }; static struct eloop_data eloop; #ifdef WPA_TRACE static void eloop_sigsegv_handler(int sig) { wpa_trace_show("eloop SIGSEGV"); abort(); } static void eloop_trace_sock_add_ref(struct eloop_sock_table *table) { int i; if (table == NULL || table->table == NULL) return; for (i = 0; i < table->count; i++) { wpa_trace_add_ref(&table->table[i], eloop, table->table[i].eloop_data); wpa_trace_add_ref(&table->table[i], user, table->table[i].user_data); } } static void eloop_trace_sock_remove_ref(struct eloop_sock_table *table) { int i; if (table == NULL || table->table == NULL) return; for (i = 0; i < table->count; i++) { wpa_trace_remove_ref(&table->table[i], eloop, table->table[i].eloop_data); wpa_trace_remove_ref(&table->table[i], user, table->table[i].user_data); } } #else /* WPA_TRACE */ #define eloop_trace_sock_add_ref(table) do { } while (0) #define eloop_trace_sock_remove_ref(table) do { } while (0) #endif /* WPA_TRACE */ int eloop_init(void) { os_memset(&eloop, 0, sizeof(eloop)); dl_list_init(&eloop.timeout); #ifdef CONFIG_ELOOP_EPOLL eloop.epollfd = epoll_create1(0); if (eloop.epollfd < 0) { wpa_printf(MSG_ERROR, "%s: epoll_create1 failed. %s\n", __func__, strerror(errno)); return -1; } eloop.readers.type = EVENT_TYPE_READ; eloop.writers.type = EVENT_TYPE_WRITE; eloop.exceptions.type = EVENT_TYPE_EXCEPTION; #endif /* CONFIG_ELOOP_EPOLL */ #ifdef WPA_TRACE signal(SIGSEGV, eloop_sigsegv_handler); #endif /* WPA_TRACE */ return 0; } static int eloop_sock_table_add_sock(struct eloop_sock_table *table, int sock, eloop_sock_handler handler, void *eloop_data, void *user_data) { #ifdef CONFIG_ELOOP_EPOLL struct eloop_sock *temp_table; struct epoll_event ev, *temp_events; int next; #endif /* CONFIG_ELOOP_EPOLL */ struct eloop_sock *tmp; int new_max_sock; if (sock > eloop.max_sock) new_max_sock = sock; else new_max_sock = eloop.max_sock; if (table == NULL) return -1; #ifdef CONFIG_ELOOP_POLL if (new_max_sock >= eloop.max_pollfd_map) { struct pollfd **nmap; nmap = os_realloc_array(eloop.pollfds_map, new_max_sock + 50, sizeof(struct pollfd *)); if (nmap == NULL) return -1; eloop.max_pollfd_map = new_max_sock + 50; eloop.pollfds_map = nmap; } if (eloop.count + 1 > eloop.max_poll_fds) { struct pollfd *n; int nmax = eloop.count + 1 + 50; n = os_realloc_array(eloop.pollfds, nmax, sizeof(struct pollfd)); if (n == NULL) return -1; eloop.max_poll_fds = nmax; eloop.pollfds = n; } #endif /* CONFIG_ELOOP_POLL */ #ifdef CONFIG_ELOOP_EPOLL if (new_max_sock >= eloop.epoll_max_fd) { next = eloop.epoll_max_fd == 0 ? 16 : eloop.epoll_max_fd * 2; temp_table = os_realloc_array(eloop.epoll_table, next, sizeof(struct eloop_sock)); if (temp_table == NULL) return -1; eloop.epoll_max_fd = next; eloop.epoll_table = temp_table; } if (eloop.count + 1 > eloop.epoll_max_event_num) { next = eloop.epoll_max_event_num == 0 ? 8 : eloop.epoll_max_event_num * 2; temp_events = os_realloc_array(eloop.epoll_events, next, sizeof(struct epoll_event)); if (temp_events == NULL) { wpa_printf(MSG_ERROR, "%s: malloc for epoll failed. " "%s\n", __func__, strerror(errno)); return -1; } eloop.epoll_max_event_num = next; eloop.epoll_events = temp_events; } #endif /* CONFIG_ELOOP_EPOLL */ eloop_trace_sock_remove_ref(table); tmp = os_realloc_array(table->table, table->count + 1, sizeof(struct eloop_sock)); if (tmp == NULL) return -1; tmp[table->count].sock = sock; tmp[table->count].eloop_data = eloop_data; tmp[table->count].user_data = user_data; tmp[table->count].handler = handler; wpa_trace_record(&tmp[table->count]); table->count++; table->table = tmp; eloop.max_sock = new_max_sock; eloop.count++; #ifndef CONFIG_ELOOP_EPOLL table->changed = 1; #endif /* CONFIG_ELOOP_EPOLL */ eloop_trace_sock_add_ref(table); #ifdef CONFIG_ELOOP_EPOLL os_memset(&ev, 0, sizeof(ev)); switch (table->type) { case EVENT_TYPE_READ: ev.events = EPOLLIN; break; case EVENT_TYPE_WRITE: ev.events = EPOLLOUT; break; /* * Exceptions are always checked when using epoll, but I suppose it's * possible that someone registered a socket *only* for exception * handling. */ case EVENT_TYPE_EXCEPTION: ev.events = EPOLLERR | EPOLLHUP; break; } ev.data.fd = sock; if (epoll_ctl(eloop.epollfd, EPOLL_CTL_ADD, sock, &ev) < 0) { wpa_printf(MSG_ERROR, "%s: epoll_ctl(ADD) for fd=%d " "failed. %s\n", __func__, sock, strerror(errno)); return -1; } os_memcpy(&eloop.epoll_table[sock], &table->table[table->count - 1], sizeof(struct eloop_sock)); #endif /* CONFIG_ELOOP_EPOLL */ return 0; } static void eloop_sock_table_remove_sock(struct eloop_sock_table *table, int sock) { int i; if (table == NULL || table->table == NULL || table->count == 0) return; for (i = 0; i < table->count; i++) { if (table->table[i].sock == sock) break; } if (i == table->count) return; eloop_trace_sock_remove_ref(table); if (i != table->count - 1) { os_memmove(&table->table[i], &table->table[i + 1], (table->count - i - 1) * sizeof(struct eloop_sock)); } table->count--; eloop.count--; #ifndef CONFIG_ELOOP_EPOLL table->changed = 1; #endif /* CONFIG_ELOOP_EPOLL */ eloop_trace_sock_add_ref(table); #ifdef CONFIG_ELOOP_EPOLL if (epoll_ctl(eloop.epollfd, EPOLL_CTL_DEL, sock, NULL) < 0) { wpa_printf(MSG_ERROR, "%s: epoll_ctl(DEL) for fd=%d " "failed. %s\n", __func__, sock, strerror(errno)); return; } os_memset(&eloop.epoll_table[sock], 0, sizeof(struct eloop_sock)); #endif /* CONFIG_ELOOP_EPOLL */ } #ifdef CONFIG_ELOOP_POLL static struct pollfd * find_pollfd(struct pollfd **pollfds_map, int fd, int mx) { if (fd < mx && fd >= 0) return pollfds_map[fd]; return NULL; } static int eloop_sock_table_set_fds(struct eloop_sock_table *readers, struct eloop_sock_table *writers, struct eloop_sock_table *exceptions, struct pollfd *pollfds, struct pollfd **pollfds_map, int max_pollfd_map) { int i; int nxt = 0; int fd; struct pollfd *pfd; /* Clear pollfd lookup map. It will be re-populated below. */ os_memset(pollfds_map, 0, sizeof(struct pollfd *) * max_pollfd_map); if (readers && readers->table) { for (i = 0; i < readers->count; i++) { fd = readers->table[i].sock; assert(fd >= 0 && fd < max_pollfd_map); pollfds[nxt].fd = fd; pollfds[nxt].events = POLLIN; pollfds[nxt].revents = 0; pollfds_map[fd] = &(pollfds[nxt]); nxt++; } } if (writers && writers->table) { for (i = 0; i < writers->count; i++) { /* * See if we already added this descriptor, update it * if so. */ fd = writers->table[i].sock; assert(fd >= 0 && fd < max_pollfd_map); pfd = pollfds_map[fd]; if (!pfd) { pfd = &(pollfds[nxt]); pfd->events = 0; pfd->fd = fd; pollfds[i].revents = 0; pollfds_map[fd] = pfd; nxt++; } pfd->events |= POLLOUT; } } /* * Exceptions are always checked when using poll, but I suppose it's * possible that someone registered a socket *only* for exception * handling. Set the POLLIN bit in this case. */ if (exceptions && exceptions->table) { for (i = 0; i < exceptions->count; i++) { /* * See if we already added this descriptor, just use it * if so. */ fd = exceptions->table[i].sock; assert(fd >= 0 && fd < max_pollfd_map); pfd = pollfds_map[fd]; if (!pfd) { pfd = &(pollfds[nxt]); pfd->events = POLLIN; pfd->fd = fd; pollfds[i].revents = 0; pollfds_map[fd] = pfd; nxt++; } } } return nxt; } static int eloop_sock_table_dispatch_table(struct eloop_sock_table *table, struct pollfd **pollfds_map, int max_pollfd_map, short int revents) { int i; struct pollfd *pfd; if (!table || !table->table) return 0; table->changed = 0; for (i = 0; i < table->count; i++) { pfd = find_pollfd(pollfds_map, table->table[i].sock, max_pollfd_map); if (!pfd) continue; if (!(pfd->revents & revents)) continue; table->table[i].handler(table->table[i].sock, table->table[i].eloop_data, table->table[i].user_data); if (table->changed) return 1; } return 0; } static void eloop_sock_table_dispatch(struct eloop_sock_table *readers, struct eloop_sock_table *writers, struct eloop_sock_table *exceptions, struct pollfd **pollfds_map, int max_pollfd_map) { if (eloop_sock_table_dispatch_table(readers, pollfds_map, max_pollfd_map, POLLIN | POLLERR | POLLHUP)) return; /* pollfds may be invalid at this point */ if (eloop_sock_table_dispatch_table(writers, pollfds_map, max_pollfd_map, POLLOUT)) return; /* pollfds may be invalid at this point */ eloop_sock_table_dispatch_table(exceptions, pollfds_map, max_pollfd_map, POLLERR | POLLHUP); } #endif /* CONFIG_ELOOP_POLL */ #ifdef CONFIG_ELOOP_SELECT static void eloop_sock_table_set_fds(struct eloop_sock_table *table, fd_set *fds) { int i; FD_ZERO(fds); if (table->table == NULL) return; for (i = 0; i < table->count; i++) { assert(table->table[i].sock >= 0); FD_SET(table->table[i].sock, fds); } } static void eloop_sock_table_dispatch(struct eloop_sock_table *table, fd_set *fds) { int i; if (table == NULL || table->table == NULL) return; table->changed = 0; for (i = 0; i < table->count; i++) { if (FD_ISSET(table->table[i].sock, fds)) { table->table[i].handler(table->table[i].sock, table->table[i].eloop_data, table->table[i].user_data); if (table->changed) break; } } } #endif /* CONFIG_ELOOP_SELECT */ #ifdef CONFIG_ELOOP_EPOLL static void eloop_sock_table_dispatch(struct epoll_event *events, int nfds) { struct eloop_sock *table; int i; for (i = 0; i < nfds; i++) { table = &eloop.epoll_table[events[i].data.fd]; if (table->handler == NULL) continue; table->handler(table->sock, table->eloop_data, table->user_data); } } #endif /* CONFIG_ELOOP_EPOLL */ static void eloop_sock_table_destroy(struct eloop_sock_table *table) { if (table) { int i; for (i = 0; i < table->count && table->table; i++) { wpa_printf(MSG_INFO, "ELOOP: remaining socket: " "sock=%d eloop_data=%p user_data=%p " "handler=%p", table->table[i].sock, table->table[i].eloop_data, table->table[i].user_data, table->table[i].handler); wpa_trace_dump_funcname("eloop unregistered socket " "handler", table->table[i].handler); wpa_trace_dump("eloop sock", &table->table[i]); } os_free(table->table); } } int eloop_register_read_sock(int sock, eloop_sock_handler handler, void *eloop_data, void *user_data) { return eloop_register_sock(sock, EVENT_TYPE_READ, handler, eloop_data, user_data); } void eloop_unregister_read_sock(int sock) { eloop_unregister_sock(sock, EVENT_TYPE_READ); } static struct eloop_sock_table *eloop_get_sock_table(eloop_event_type type) { switch (type) { case EVENT_TYPE_READ: return &eloop.readers; case EVENT_TYPE_WRITE: return &eloop.writers; case EVENT_TYPE_EXCEPTION: return &eloop.exceptions; } return NULL; } int eloop_register_sock(int sock, eloop_event_type type, eloop_sock_handler handler, void *eloop_data, void *user_data) { struct eloop_sock_table *table; assert(sock >= 0); table = eloop_get_sock_table(type); return eloop_sock_table_add_sock(table, sock, handler, eloop_data, user_data); } void eloop_unregister_sock(int sock, eloop_event_type type) { struct eloop_sock_table *table; table = eloop_get_sock_table(type); eloop_sock_table_remove_sock(table, sock); } int eloop_register_timeout(unsigned int secs, unsigned int usecs, eloop_timeout_handler handler, void *eloop_data, void *user_data) { struct eloop_timeout *timeout, *tmp; os_time_t now_sec; timeout = os_zalloc(sizeof(*timeout)); if (timeout == NULL) return -1; if (os_get_reltime(&timeout->time) < 0) { os_free(timeout); return -1; } now_sec = timeout->time.sec; timeout->time.sec += secs; if (timeout->time.sec < now_sec) { /* * Integer overflow - assume long enough timeout to be assumed * to be infinite, i.e., the timeout would never happen. */ wpa_printf(MSG_DEBUG, "ELOOP: Too long timeout (secs=%u) to " "ever happen - ignore it", secs); os_free(timeout); return 0; } timeout->time.usec += usecs; while (timeout->time.usec >= 1000000) { timeout->time.sec++; timeout->time.usec -= 1000000; } timeout->eloop_data = eloop_data; timeout->user_data = user_data; timeout->handler = handler; wpa_trace_add_ref(timeout, eloop, eloop_data); wpa_trace_add_ref(timeout, user, user_data); wpa_trace_record(timeout); /* Maintain timeouts in order of increasing time */ dl_list_for_each(tmp, &eloop.timeout, struct eloop_timeout, list) { if (os_reltime_before(&timeout->time, &tmp->time)) { dl_list_add(tmp->list.prev, &timeout->list); return 0; } } dl_list_add_tail(&eloop.timeout, &timeout->list); return 0; } static void eloop_remove_timeout(struct eloop_timeout *timeout) { dl_list_del(&timeout->list); wpa_trace_remove_ref(timeout, eloop, timeout->eloop_data); wpa_trace_remove_ref(timeout, user, timeout->user_data); os_free(timeout); } int eloop_cancel_timeout(eloop_timeout_handler handler, void *eloop_data, void *user_data) { struct eloop_timeout *timeout, *prev; int removed = 0; dl_list_for_each_safe(timeout, prev, &eloop.timeout, struct eloop_timeout, list) { if (timeout->handler == handler && (timeout->eloop_data == eloop_data || eloop_data == ELOOP_ALL_CTX) && (timeout->user_data == user_data || user_data == ELOOP_ALL_CTX)) { eloop_remove_timeout(timeout); removed++; } } return removed; } int eloop_cancel_timeout_one(eloop_timeout_handler handler, void *eloop_data, void *user_data, struct os_reltime *remaining) { struct eloop_timeout *timeout, *prev; int removed = 0; struct os_reltime now; os_get_reltime(&now); remaining->sec = remaining->usec = 0; dl_list_for_each_safe(timeout, prev, &eloop.timeout, struct eloop_timeout, list) { if (timeout->handler == handler && (timeout->eloop_data == eloop_data) && (timeout->user_data == user_data)) { removed = 1; if (os_reltime_before(&now, &timeout->time)) os_reltime_sub(&timeout->time, &now, remaining); eloop_remove_timeout(timeout); break; } } return removed; } int eloop_is_timeout_registered(eloop_timeout_handler handler, void *eloop_data, void *user_data) { struct eloop_timeout *tmp; dl_list_for_each(tmp, &eloop.timeout, struct eloop_timeout, list) { if (tmp->handler == handler && tmp->eloop_data == eloop_data && tmp->user_data == user_data) return 1; } return 0; } int eloop_deplete_timeout(unsigned int req_secs, unsigned int req_usecs, eloop_timeout_handler handler, void *eloop_data, void *user_data) { struct os_reltime now, requested, remaining; struct eloop_timeout *tmp; dl_list_for_each(tmp, &eloop.timeout, struct eloop_timeout, list) { if (tmp->handler == handler && tmp->eloop_data == eloop_data && tmp->user_data == user_data) { requested.sec = req_secs; requested.usec = req_usecs; os_get_reltime(&now); os_reltime_sub(&tmp->time, &now, &remaining); if (os_reltime_before(&requested, &remaining)) { eloop_cancel_timeout(handler, eloop_data, user_data); eloop_register_timeout(requested.sec, requested.usec, handler, eloop_data, user_data); return 1; } return 0; } } return -1; } int eloop_replenish_timeout(unsigned int req_secs, unsigned int req_usecs, eloop_timeout_handler handler, void *eloop_data, void *user_data) { struct os_reltime now, requested, remaining; struct eloop_timeout *tmp; dl_list_for_each(tmp, &eloop.timeout, struct eloop_timeout, list) { if (tmp->handler == handler && tmp->eloop_data == eloop_data && tmp->user_data == user_data) { requested.sec = req_secs; requested.usec = req_usecs; os_get_reltime(&now); os_reltime_sub(&tmp->time, &now, &remaining); if (os_reltime_before(&remaining, &requested)) { eloop_cancel_timeout(handler, eloop_data, user_data); eloop_register_timeout(requested.sec, requested.usec, handler, eloop_data, user_data); return 1; } return 0; } } return -1; } #ifndef CONFIG_NATIVE_WINDOWS static void eloop_handle_alarm(int sig) { wpa_printf(MSG_ERROR, "eloop: could not process SIGINT or SIGTERM in " "two seconds. Looks like there\n" "is a bug that ends up in a busy loop that " "prevents clean shutdown.\n" "Killing program forcefully.\n"); exit(1); } #endif /* CONFIG_NATIVE_WINDOWS */ static void eloop_handle_signal(int sig) { int i; #ifndef CONFIG_NATIVE_WINDOWS if ((sig == SIGINT || sig == SIGTERM) && !eloop.pending_terminate) { /* Use SIGALRM to break out from potential busy loops that * would not allow the program to be killed. */ eloop.pending_terminate = 1; signal(SIGALRM, eloop_handle_alarm); alarm(2); } #endif /* CONFIG_NATIVE_WINDOWS */ eloop.signaled++; for (i = 0; i < eloop.signal_count; i++) { if (eloop.signals[i].sig == sig) { eloop.signals[i].signaled++; break; } } } static void eloop_process_pending_signals(void) { int i; if (eloop.signaled == 0) return; eloop.signaled = 0; if (eloop.pending_terminate) { #ifndef CONFIG_NATIVE_WINDOWS alarm(0); #endif /* CONFIG_NATIVE_WINDOWS */ eloop.pending_terminate = 0; } for (i = 0; i < eloop.signal_count; i++) { if (eloop.signals[i].signaled) { eloop.signals[i].signaled = 0; eloop.signals[i].handler(eloop.signals[i].sig, eloop.signals[i].user_data); } } } int eloop_register_signal(int sig, eloop_signal_handler handler, void *user_data) { struct eloop_signal *tmp; tmp = os_realloc_array(eloop.signals, eloop.signal_count + 1, sizeof(struct eloop_signal)); if (tmp == NULL) return -1; tmp[eloop.signal_count].sig = sig; tmp[eloop.signal_count].user_data = user_data; tmp[eloop.signal_count].handler = handler; tmp[eloop.signal_count].signaled = 0; eloop.signal_count++; eloop.signals = tmp; signal(sig, eloop_handle_signal); return 0; } int eloop_register_signal_terminate(eloop_signal_handler handler, void *user_data) { int ret = eloop_register_signal(SIGINT, handler, user_data); if (ret == 0) ret = eloop_register_signal(SIGTERM, handler, user_data); return ret; } int eloop_register_signal_reconfig(eloop_signal_handler handler, void *user_data) { #ifdef CONFIG_NATIVE_WINDOWS return 0; #else /* CONFIG_NATIVE_WINDOWS */ return eloop_register_signal(SIGHUP, handler, user_data); #endif /* CONFIG_NATIVE_WINDOWS */ } void eloop_run(void) { #ifdef CONFIG_ELOOP_POLL int num_poll_fds; int timeout_ms = 0; #endif /* CONFIG_ELOOP_POLL */ #ifdef CONFIG_ELOOP_SELECT fd_set *rfds, *wfds, *efds; struct timeval _tv; #endif /* CONFIG_ELOOP_SELECT */ #ifdef CONFIG_ELOOP_EPOLL int timeout_ms = -1; #endif /* CONFIG_ELOOP_EPOLL */ int res; struct os_reltime tv, now; #ifdef CONFIG_ELOOP_SELECT rfds = os_malloc(sizeof(*rfds)); wfds = os_malloc(sizeof(*wfds)); efds = os_malloc(sizeof(*efds)); if (rfds == NULL || wfds == NULL || efds == NULL) goto out; #endif /* CONFIG_ELOOP_SELECT */ while (!eloop.terminate && (!dl_list_empty(&eloop.timeout) || eloop.readers.count > 0 || eloop.writers.count > 0 || eloop.exceptions.count > 0)) { struct eloop_timeout *timeout; timeout = dl_list_first(&eloop.timeout, struct eloop_timeout, list); if (timeout) { os_get_reltime(&now); if (os_reltime_before(&now, &timeout->time)) os_reltime_sub(&timeout->time, &now, &tv); else tv.sec = tv.usec = 0; #if defined(CONFIG_ELOOP_POLL) || defined(CONFIG_ELOOP_EPOLL) timeout_ms = tv.sec * 1000 + tv.usec / 1000; #endif /* defined(CONFIG_ELOOP_POLL) || defined(CONFIG_ELOOP_EPOLL) */ #ifdef CONFIG_ELOOP_SELECT _tv.tv_sec = tv.sec; _tv.tv_usec = tv.usec; #endif /* CONFIG_ELOOP_SELECT */ } #ifdef CONFIG_ELOOP_POLL num_poll_fds = eloop_sock_table_set_fds( &eloop.readers, &eloop.writers, &eloop.exceptions, eloop.pollfds, eloop.pollfds_map, eloop.max_pollfd_map); res = poll(eloop.pollfds, num_poll_fds, timeout ? timeout_ms : -1); #endif /* CONFIG_ELOOP_POLL */ #ifdef CONFIG_ELOOP_SELECT eloop_sock_table_set_fds(&eloop.readers, rfds); eloop_sock_table_set_fds(&eloop.writers, wfds); eloop_sock_table_set_fds(&eloop.exceptions, efds); res = select(eloop.max_sock + 1, rfds, wfds, efds, timeout ? &_tv : NULL); #endif /* CONFIG_ELOOP_SELECT */ #ifdef CONFIG_ELOOP_EPOLL if (eloop.count == 0) { res = 0; } else { res = epoll_wait(eloop.epollfd, eloop.epoll_events, eloop.count, timeout_ms); } #endif /* CONFIG_ELOOP_EPOLL */ if (res < 0 && errno != EINTR && errno != 0) { wpa_printf(MSG_ERROR, "eloop: %s: %s", #ifdef CONFIG_ELOOP_POLL "poll" #endif /* CONFIG_ELOOP_POLL */ #ifdef CONFIG_ELOOP_SELECT "select" #endif /* CONFIG_ELOOP_SELECT */ #ifdef CONFIG_ELOOP_EPOLL "epoll" #endif /* CONFIG_ELOOP_EPOLL */ , strerror(errno)); goto out; } eloop_process_pending_signals(); /* check if some registered timeouts have occurred */ timeout = dl_list_first(&eloop.timeout, struct eloop_timeout, list); if (timeout) { os_get_reltime(&now); if (!os_reltime_before(&now, &timeout->time)) { void *eloop_data = timeout->eloop_data; void *user_data = timeout->user_data; eloop_timeout_handler handler = timeout->handler; eloop_remove_timeout(timeout); handler(eloop_data, user_data); } } if (res <= 0) continue; #ifdef CONFIG_ELOOP_POLL eloop_sock_table_dispatch(&eloop.readers, &eloop.writers, &eloop.exceptions, eloop.pollfds_map, eloop.max_pollfd_map); #endif /* CONFIG_ELOOP_POLL */ #ifdef CONFIG_ELOOP_SELECT eloop_sock_table_dispatch(&eloop.readers, rfds); eloop_sock_table_dispatch(&eloop.writers, wfds); eloop_sock_table_dispatch(&eloop.exceptions, efds); #endif /* CONFIG_ELOOP_SELECT */ #ifdef CONFIG_ELOOP_EPOLL eloop_sock_table_dispatch(eloop.epoll_events, res); #endif /* CONFIG_ELOOP_EPOLL */ } eloop.terminate = 0; out: #ifdef CONFIG_ELOOP_SELECT os_free(rfds); os_free(wfds); os_free(efds); #endif /* CONFIG_ELOOP_SELECT */ return; } void eloop_terminate(void) { eloop.terminate = 1; } void eloop_destroy(void) { struct eloop_timeout *timeout, *prev; struct os_reltime now; os_get_reltime(&now); dl_list_for_each_safe(timeout, prev, &eloop.timeout, struct eloop_timeout, list) { int sec, usec; sec = timeout->time.sec - now.sec; usec = timeout->time.usec - now.usec; if (timeout->time.usec < now.usec) { sec--; usec += 1000000; } wpa_printf(MSG_INFO, "ELOOP: remaining timeout: %d.%06d " "eloop_data=%p user_data=%p handler=%p", sec, usec, timeout->eloop_data, timeout->user_data, timeout->handler); wpa_trace_dump_funcname("eloop unregistered timeout handler", timeout->handler); wpa_trace_dump("eloop timeout", timeout); eloop_remove_timeout(timeout); } eloop_sock_table_destroy(&eloop.readers); eloop_sock_table_destroy(&eloop.writers); eloop_sock_table_destroy(&eloop.exceptions); os_free(eloop.signals); #ifdef CONFIG_ELOOP_POLL os_free(eloop.pollfds); os_free(eloop.pollfds_map); #endif /* CONFIG_ELOOP_POLL */ #ifdef CONFIG_ELOOP_EPOLL os_free(eloop.epoll_table); os_free(eloop.epoll_events); close(eloop.epollfd); #endif /* CONFIG_ELOOP_EPOLL */ } int eloop_terminated(void) { return eloop.terminate; } void eloop_wait_for_read_sock(int sock) { #ifdef CONFIG_ELOOP_POLL struct pollfd pfd; if (sock < 0) return; os_memset(&pfd, 0, sizeof(pfd)); pfd.fd = sock; pfd.events = POLLIN; poll(&pfd, 1, -1); #endif /* CONFIG_ELOOP_POLL */ #if defined(CONFIG_ELOOP_SELECT) || defined(CONFIG_ELOOP_EPOLL) /* * We can use epoll() here. But epoll() requres 4 system calls. * epoll_create1(), epoll_ctl() for ADD, epoll_wait, and close() for * epoll fd. So select() is better for performance here. */ fd_set rfds; if (sock < 0) return; FD_ZERO(&rfds); FD_SET(sock, &rfds); select(sock + 1, &rfds, NULL, NULL, NULL); #endif /* defined(CONFIG_ELOOP_SELECT) || defined(CONFIG_ELOOP_EPOLL) */ } #ifdef CONFIG_ELOOP_SELECT #undef CONFIG_ELOOP_SELECT #endif /* CONFIG_ELOOP_SELECT */