Initial import

1 files changed, 272 insertions, 0 deletions

diff --git a/uloop.c b/uloop.c
new file mode 100644
index 0000000..627ba1c
--- /dev/null
+++ b/uloop.c
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+/*
+ *   Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
+ *   Copyright (C) 2010 John Crispin <blogic@openwrt.org>
+ *   Copyright (C) 2010 Steven Barth <steven@midlink.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
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/epoll.h>
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <poll.h>
+#include <string.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdbool.h>
+
+#include "uloop.h"
+
+/**
+ * FIXME: uClibc < 0.9.30.3 does not define EPOLLRDHUP for Linux >= 2.6.17
+ */
+#ifndef EPOLLRDHUP
+#define EPOLLRDHUP 0x2000
+#endif
+
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+#endif
+
+struct uloop_timeout *first_timeout;
+static int epoll_fd;
+static bool cancel;
+
+int uloop_fd_add(struct uloop_fd *sock, unsigned int flags)
+{
+	struct epoll_event ev;
+	int op = sock->registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
+	unsigned int fl;
+	int ret;
+
+	if (!sock->registered) {
+		fl = fcntl(sock->fd, F_GETFL, 0);
+		fl |= O_NONBLOCK;
+		fcntl(sock->fd, F_SETFL, fl);
+	}
+
+	memset(&ev, 0, sizeof(struct epoll_event));
+
+	if (flags & ULOOP_READ)
+		ev.events |= EPOLLIN | EPOLLRDHUP;
+
+	if (flags & ULOOP_WRITE)
+		ev.events |= EPOLLOUT;
+
+	if (flags & ULOOP_EDGE_TRIGGER)
+		ev.events |= EPOLLET;
+
+	ev.data.fd = sock->fd;
+	ev.data.ptr = sock;
+
+	ret = epoll_ctl(epoll_fd, op, sock->fd, &ev);
+	if (ret < 0)
+		goto out;
+
+	sock->registered = true;
+	sock->eof = false;
+
+out:
+	return ret;
+}
+
+int uloop_fd_delete(struct uloop_fd *sock)
+{
+	sock->registered = false;
+	return epoll_ctl(epoll_fd, EPOLL_CTL_DEL, sock->fd, 0);
+}
+
+static int tv_diff(struct timeval *t1, struct timeval *t2)
+{
+	if (t1->tv_sec != t2->tv_sec)
+		return (t1->tv_sec - t2->tv_sec) * 1000;
+	else
+		return (t1->tv_usec - t2->tv_usec) / 1000;
+}
+
+int uloop_timeout_add(struct uloop_timeout *timeout)
+{
+	struct uloop_timeout **head = &first_timeout;
+	struct uloop_timeout *prev = NULL;
+
+	if (timeout->pending)
+		return -1;
+
+	while (*head) {
+		if (tv_diff(&(*head)->time, &timeout->time) > 0)
+			break;
+
+		prev = *head;
+		head = &(*head)->next;
+	}
+
+	timeout->prev = prev;
+	timeout->next = *head;
+	if (timeout->next)
+		timeout->next->prev = timeout;
+	*head = timeout;
+	timeout->pending = true;
+
+	return 0;
+}
+
+int uloop_timeout_set(struct uloop_timeout *timeout, int msecs)
+{
+	struct timeval *time = &timeout->time;
+
+	if (timeout->pending)
+		uloop_timeout_cancel(timeout);
+
+	gettimeofday(&timeout->time, NULL);
+
+	time->tv_sec += msecs / 1000;
+	time->tv_usec += msecs % 1000;
+
+	if (time->tv_usec > 1000000) {
+		time->tv_sec++;
+		time->tv_usec %= 100000;
+	}
+
+	return uloop_timeout_add(timeout);
+}
+
+int uloop_timeout_cancel(struct uloop_timeout *timeout)
+{
+	if (!timeout->pending)
+		return -1;
+
+	if (timeout->prev)
+		timeout->prev->next = timeout->next;
+	else
+		first_timeout = timeout->next;
+
+	if (timeout->next)
+		timeout->next->prev = timeout->prev;
+
+	timeout->pending = false;
+
+	return 0;
+}
+
+static void uloop_handle_sigint(int signo)
+{
+	cancel = true;
+}
+
+static void uloop_setup_signals(void)
+{
+	struct sigaction s;
+	memset(&s, 0, sizeof(struct sigaction));
+	s.sa_handler = uloop_handle_sigint;
+	s.sa_flags = 0;
+	sigaction(SIGINT, &s, NULL);
+}
+
+static int uloop_get_next_timeout(struct timeval *tv)
+{
+	int diff;
+
+	if (!first_timeout)
+		return -1;
+
+	diff = tv_diff(&first_timeout->time, tv);
+	if (diff < 0)
+		return 0;
+
+	return diff;
+}
+
+static void uloop_process_timeouts(struct timeval *tv)
+{
+	struct uloop_timeout *timeout;
+
+	while (first_timeout) {
+		if (tv_diff(&first_timeout->time, tv) > 0)
+			break;
+
+		timeout = first_timeout;
+		uloop_timeout_cancel(timeout);
+		if (timeout->cb)
+			timeout->cb(timeout);
+	}
+}
+
+void uloop_end(void)
+{
+	cancel = true;
+}
+
+int uloop_init(void)
+{
+	epoll_fd = epoll_create(32);
+	if (epoll_fd < 0)
+		return -1;
+
+	fcntl(epoll_fd, F_SETFD, fcntl(epoll_fd, F_GETFD) | FD_CLOEXEC);
+	return 0;
+}
+
+void uloop_run(void)
+{
+	struct epoll_event events[10];
+	struct timeval tv;
+	int timeout;
+	int nfds, n;
+
+	uloop_setup_signals();
+	while(!cancel)
+	{
+		gettimeofday(&tv, NULL);
+		uloop_process_timeouts(&tv);
+		timeout = uloop_get_next_timeout(&tv);
+		nfds = epoll_wait(epoll_fd, events, ARRAY_SIZE(events), timeout);
+		for(n = 0; n < nfds; ++n)
+		{
+			struct uloop_fd *u = events[n].data.ptr;
+			unsigned int ev = 0;
+
+			if(events[n].events & EPOLLERR) {
+				u->error = true;
+				uloop_fd_delete(u);
+			}
+
+			if(!(events[n].events & (EPOLLRDHUP|EPOLLIN|EPOLLOUT|EPOLLERR)))
+				continue;
+
+			if(events[n].events & EPOLLRDHUP)
+				u->eof = true;
+
+			if(events[n].events & EPOLLIN)
+				ev |= ULOOP_READ;
+
+			if(events[n].events & EPOLLOUT)
+				ev |= ULOOP_WRITE;
+
+			if(u->cb)
+				u->cb(u, ev);
+		}
+	}
+}
+
+void uloop_done(void)
+{
+	close(epoll_fd);
+}