X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fevent.c;h=c373eaca9590c13450fc4c2eac1d44e8003cdd04;hb=d3849fcb278d1df005c507f7e18a8397574f7f47;hp=8c7de4799e95f570d858d6a063585d018627a85f;hpb=a742ea4d040ecfaabbc875c63f2625654ce68923;p=tinc

diff --git a/src/event.c b/src/event.c
index 8c7de479..c373eaca 100644
--- a/src/event.c
+++ b/src/event.c
@@ -1,6 +1,6 @@
 /*
     event.c -- I/O, timeout and signal event handling
-    Copyright (C) 2012-2013 Guus Sliepen <guus@tinc-vpn.org>
+    Copyright (C) 2012-2022 Guus Sliepen <guus@tinc-vpn.org>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -19,26 +19,74 @@
 
 #include "system.h"
 
-#include "dropin.h"
+#ifdef HAVE_WINDOWS
+#  include <assert.h>
+#else
+#  if defined(HAVE_SYS_EPOLL_H)
+#    include <sys/epoll.h>
+#    define HAVE_EPOLL 1
+#  elif defined(HAVE_SYS_EVENT_H)
+#    include <sys/event.h>
+#    define HAVE_KQUEUE 1
+#  else
+#    define HAVE_SELECT 1
+#  endif
+#endif
+
 #include "event.h"
-#include "net.h"
 #include "utils.h"
-#include "xalloc.h"
+#include "net.h"
 
 struct timeval now;
+static bool running;
 
-#ifndef HAVE_MINGW
+#if defined(HAVE_EPOLL) || defined(HAVE_KQUEUE)
+static int event_fd = 0;
+#elif defined(HAVE_SELECT)
 static fd_set readfds;
 static fd_set writefds;
-#else
+#elif defined(HAVE_WINDOWS)
 static const long READ_EVENTS = FD_READ | FD_ACCEPT | FD_CLOSE;
 static const long WRITE_EVENTS = FD_WRITE | FD_CONNECT;
 static DWORD event_count = 0;
 #endif
-static bool running;
+
+static inline void event_init(void) {
+#if defined(HAVE_EPOLL) || defined(HAVE_KQUEUE)
+
+	if(!event_fd) {
+#if defined(HAVE_EPOLL)
+		/* NOTE: 1024 limit is only used on ancient (pre 2.6.27) kernels.
+		   Decent kernels will ignore this value making it unlimited.
+		   epoll_create1 might be better, but these kernels would not be supported
+		   in that case. */
+		event_fd = epoll_create(1024);
+#else
+		event_fd = kqueue();
+#endif
+
+		if(event_fd == -1) {
+			logger(DEBUG_ALWAYS, LOG_EMERG, "Could not initialize events: %s", strerror(errno));
+			abort();
+		}
+	}
+
+#endif
+}
+
+static void event_deinit(void) {
+#if defined(HAVE_EPOLL) || defined(HAVE_KQUEUE)
+
+	if(event_fd > 0) {
+		close(event_fd);
+		event_fd = 0;
+	}
+
+#endif
+}
 
 static int io_compare(const io_t *a, const io_t *b) {
-#ifndef HAVE_MINGW
+#ifndef HAVE_WINDOWS
 	return a->fd - b->fd;
 #else
 
@@ -94,7 +142,7 @@ void io_add(io_t *io, io_cb_t cb, void *data, int fd, int flags) {
 	}
 
 	io->fd = fd;
-#ifdef HAVE_MINGW
+#ifdef HAVE_WINDOWS
 
 	if(io->fd != -1) {
 		io->event = WSACreateEvent();
@@ -112,12 +160,16 @@ void io_add(io_t *io, io_cb_t cb, void *data, int fd, int flags) {
 
 	io_set(io, flags);
 
+#ifdef HAVE_SELECT
+
 	if(!splay_insert_node(&io_tree, &io->node)) {
 		abort();
 	}
+
+#endif
 }
 
-#ifdef HAVE_MINGW
+#ifdef HAVE_WINDOWS
 void io_add_event(io_t *io, io_cb_t cb, void *data, WSAEVENT event) {
 	io->event = event;
 	io_add(io, cb, data, -1, 0);
@@ -125,6 +177,8 @@ void io_add_event(io_t *io, io_cb_t cb, void *data, WSAEVENT event) {
 #endif
 
 void io_set(io_t *io, int flags) {
+	event_init();
+
 	if(flags == io->flags) {
 		return;
 	}
@@ -135,7 +189,69 @@ void io_set(io_t *io, int flags) {
 		return;
 	}
 
-#ifndef HAVE_MINGW
+#ifndef HAVE_WINDOWS
+#ifdef HAVE_EPOLL
+	epoll_ctl(event_fd, EPOLL_CTL_DEL, io->fd, NULL);
+
+	struct epoll_event ev = {
+		.events = 0,
+		.data.ptr = io,
+	};
+
+	if(flags & IO_READ) {
+		ev.events |= EPOLLIN;
+	}
+
+	if(flags & IO_WRITE) {
+		ev.events |= EPOLLOUT;
+	} else if(ev.events == 0) {
+		io_tree.generation++;
+		return;
+	}
+
+	if(epoll_ctl(event_fd, EPOLL_CTL_ADD, io->fd, &ev) < 0) {
+		perror("epoll_ctl_add");
+	}
+
+#endif
+
+#ifdef HAVE_KQUEUE
+	const struct kevent change[] = {
+		{
+			.ident = io->fd,
+			.filter = EVFILT_READ,
+			.flags = EV_RECEIPT | (flags & IO_READ ? EV_ADD : EV_DELETE),
+			.udata = io,
+		},
+		{
+			.ident = io->fd,
+			.filter = EVFILT_WRITE,
+			.flags = EV_RECEIPT | (flags & IO_WRITE ? EV_ADD : EV_DELETE),
+			.udata = io,
+		},
+	};
+	struct kevent result[2];
+
+	if(kevent(event_fd, change, 2, result, 2, NULL) < 0) {
+		logger(DEBUG_ALWAYS, LOG_EMERG, "kevent failed: %s", strerror(errno));
+		abort();
+	}
+
+	int rerr = (int)result[0].data;
+	int werr = (int)result[1].data;
+
+	if((rerr && rerr != ENOENT) || (werr && werr != ENOENT)) {
+		logger(DEBUG_ALWAYS, LOG_EMERG, "kevent errors: %s, %s", strerror(rerr), strerror(werr));
+		abort();
+	}
+
+	if(!flags) {
+		io_tree.generation++;
+	}
+
+#endif
+
+#ifdef HAVE_SELECT
 
 	if(flags & IO_READ) {
 		FD_SET(io->fd, &readfds);
@@ -149,6 +265,8 @@ void io_set(io_t *io, int flags) {
 		FD_CLR(io->fd, &writefds);
 	}
 
+#endif
+
 #else
 	long events = 0;
 
@@ -173,7 +291,7 @@ void io_del(io_t *io) {
 	}
 
 	io_set(io, 0);
-#ifdef HAVE_MINGW
+#ifdef HAVE_WINDOWS
 
 	if(io->fd != -1 && WSACloseEvent(io->event) == FALSE) {
 		abort();
@@ -182,11 +300,13 @@ void io_del(io_t *io) {
 	event_count--;
 #endif
 
+#if HAVE_SELECT
 	splay_unlink_node(&io_tree, &io->node);
+#endif
 	io->cb = NULL;
 }
 
-void timeout_add(timeout_t *timeout, timeout_cb_t cb, void *data, struct timeval *tv) {
+void timeout_add(timeout_t *timeout, timeout_cb_t cb, void *data, const struct timeval *tv) {
 	timeout->cb = cb;
 	timeout->data = data;
 	timeout->node.data = timeout;
@@ -194,7 +314,7 @@ void timeout_add(timeout_t *timeout, timeout_cb_t cb, void *data, struct timeval
 	timeout_set(timeout, tv);
 }
 
-void timeout_set(timeout_t *timeout, struct timeval *tv) {
+void timeout_set(timeout_t *timeout, const struct timeval *tv) {
 	if(timerisset(&timeout->tv)) {
 		splay_unlink_node(&timeout_tree, &timeout->node);
 	}
@@ -222,30 +342,36 @@ void timeout_del(timeout_t *timeout) {
 	};
 }
 
-#ifndef HAVE_MINGW
-static int signal_compare(const signal_t *a, const signal_t *b) {
-	return a->signum - b->signum;
-}
+#ifndef HAVE_WINDOWS
+
+// From Matz's Ruby
+#ifndef NSIG
+# define NSIG (_SIGMAX + 1)      /* For QNX */
+#endif
+
 
 static io_t signalio;
 static int pipefd[2] = {-1, -1};
-static splay_tree_t signal_tree = {.compare = (splay_compare_t)signal_compare};
+static signal_t *signal_handle[NSIG + 1] = {NULL};
 
 static void signal_handler(int signum) {
 	unsigned char num = signum;
-	write(pipefd[1], &num, 1);
+
+	if(write(pipefd[1], &num, 1) != 1) {
+		// Pipe full or broken, nothing we can do about it.
+	}
 }
 
 static void signalio_handler(void *data, int flags) {
+	(void)data;
+	(void)flags;
 	unsigned char signum;
 
 	if(read(pipefd[0], &signum, 1) != 1) {
 		return;
 	}
 
-	signal_t *sig = splay_search(&signal_tree, &((signal_t) {
-		.signum = signum
-	}));
+	signal_t *sig = signal_handle[signum];
 
 	if(sig) {
 		sig->cb(sig->data);
@@ -263,20 +389,17 @@ void signal_add(signal_t *sig, signal_cb_t cb, void *data, int signum) {
 		return;
 	}
 
+	sig->signum = signum;
 	sig->cb = cb;
 	sig->data = data;
-	sig->signum = signum;
-	sig->node.data = sig;
 
 	if(pipefd[0] == -1) {
 		pipe_init();
 	}
 
-	signal(sig->signum, signal_handler);
+	signal(signum, signal_handler);
 
-	if(!splay_insert_node(&signal_tree, &sig->node)) {
-		abort();
-	}
+	signal_handle[signum] = sig;
 }
 
 void signal_del(signal_t *sig) {
@@ -286,12 +409,12 @@ void signal_del(signal_t *sig) {
 
 	signal(sig->signum, SIG_DFL);
 
-	splay_unlink_node(&signal_tree, &sig->node);
+	signal_handle[sig->signum] = NULL;
 	sig->cb = NULL;
 }
 #endif
 
-static struct timeval *get_time_remaining(struct timeval *diff) {
+static struct timeval *timeout_execute(struct timeval *diff) {
 	gettimeofday(&now, NULL);
 	struct timeval *tv = NULL;
 
@@ -315,26 +438,57 @@ static struct timeval *get_time_remaining(struct timeval *diff) {
 }
 
 bool event_loop(void) {
+	event_init();
 	running = true;
 
-#ifndef HAVE_MINGW
+#ifndef HAVE_WINDOWS
+
+#ifdef HAVE_SELECT
 	fd_set readable;
 	fd_set writable;
+#endif
 
 	while(running) {
 		struct timeval diff;
-		struct timeval *tv = get_time_remaining(&diff);
+		struct timeval *tv = timeout_execute(&diff);
+
+#ifdef HAVE_SELECT
 		memcpy(&readable, &readfds, sizeof(readable));
 		memcpy(&writable, &writefds, sizeof(writable));
+#endif
 
-		int fds = 0;
+#ifdef HAVE_EPOLL
+		struct epoll_event events[MAX_EVENTS_PER_LOOP];
+		long timeout = (tv->tv_sec * 1000) + (tv->tv_usec / 1000);
+
+		if(timeout > INT_MAX) {
+			timeout = INT_MAX;
+		}
+
+		int n = epoll_wait(event_fd, events, MAX_EVENTS_PER_LOOP, (int)timeout);
+#endif
+
+#ifdef HAVE_KQUEUE
+		struct kevent events[MAX_EVENTS_PER_LOOP];
+
+		const struct timespec ts = {
+			.tv_sec = tv->tv_sec,
+			.tv_nsec = tv->tv_usec * 1000,
+		};
+
+		int n = kevent(event_fd, NULL, 0, events, MAX_EVENTS_PER_LOOP, &ts);
+#endif
+
+#ifdef HAVE_SELECT
+		int maxfds =  0;
 
 		if(io_tree.tail) {
 			io_t *last = io_tree.tail->data;
-			fds = last->fd + 1;
+			maxfds = last->fd + 1;
 		}
 
-		int n = select(fds, &readable, &writable, NULL, tv);
+		int n = select(maxfds, &readable, &writable, NULL, tv);
+#endif
 
 		if(n < 0) {
 			if(sockwouldblock(sockerrno)) {
@@ -350,6 +504,54 @@ bool event_loop(void) {
 
 		unsigned int curgen = io_tree.generation;
 
+
+#ifdef HAVE_EPOLL
+
+		for(int i = 0; i < n; i++) {
+			io_t *io = events[i].data.ptr;
+
+			if(events[i].events & EPOLLOUT && io->flags & IO_WRITE) {
+				io->cb(io->data, IO_WRITE);
+			}
+
+			if(curgen != io_tree.generation) {
+				break;
+			}
+
+			if(events[i].events & EPOLLIN && io->flags & IO_READ) {
+				io->cb(io->data, IO_READ);
+			}
+
+			if(curgen != io_tree.generation) {
+				break;
+			}
+		}
+
+#endif
+
+#ifdef HAVE_KQUEUE
+
+		for(int i = 0; i < n; i++) {
+			const struct kevent *evt = &events[i];
+			const io_t *io = evt->udata;
+
+			if(evt->filter == EVFILT_WRITE) {
+				io->cb(io->data, IO_WRITE);
+			} else if(evt->filter == EVFILT_READ) {
+				io->cb(io->data, IO_READ);
+			} else {
+				continue;
+			}
+
+			if(curgen != io_tree.generation) {
+				break;
+			}
+		}
+
+#endif
+
+#ifdef HAVE_SELECT
+
 		for splay_each(io_t, io, &io_tree) {
 			if(FD_ISSET(io->fd, &writable)) {
 				io->cb(io->data, IO_WRITE);
@@ -360,23 +562,26 @@ bool event_loop(void) {
 			}
 
 			/*
-			   There are scenarios in which the callback will remove another io_t from the tree
-			   (e.g. closing a double connection). Since splay_each does not support that, we
-			   need to exit the loop if that happens. That's okay, since any remaining events will
-			   get picked up by the next select() call.
-			 */
+			        There are scenarios in which the callback will remove another io_t from the tree
+			        (e.g. closing a double connection). Since splay_each does not support that, we
+			        need to exit the loop if that happens. That's okay, since any remaining events will
+			        get picked up by the next select() call.
+			*/
 			if(curgen != io_tree.generation) {
 				break;
 			}
 		}
+
+#endif
 	}
 
 #else
+	assert(WSA_WAIT_EVENT_0 == 0);
 
 	while(running) {
 		struct timeval diff;
-		struct timeval *tv = get_time_remaining(&diff);
-		DWORD timeout_ms = tv ? (tv->tv_sec * 1000 + tv->tv_usec / 1000 + 1) : WSA_INFINITE;
+		struct timeval *tv = timeout_execute(&diff);
+		DWORD timeout_ms = tv ? (DWORD)(tv->tv_sec * 1000 + tv->tv_usec / 1000 + 1) : WSA_INFINITE;
 
 		if(!event_count) {
 			Sleep(timeout_ms);
@@ -433,12 +638,12 @@ bool event_loop(void) {
 				break;
 			}
 
-			if(result < WSA_WAIT_EVENT_0 || result >= WSA_WAIT_EVENT_0 + event_count - event_offset) {
-				return(false);
+			if(result >= event_count - event_offset) {
+				return false;
 			}
 
 			/* Look up io in the map by index. */
-			event_index = result - WSA_WAIT_EVENT_0 + event_offset;
+			event_index = result + event_offset;
 			io_t *io = io_map[event_index];
 
 			if(io->fd == -1) {
@@ -479,6 +684,7 @@ bool event_loop(void) {
 
 #endif
 
+	event_deinit();
 	return true;
 }