X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/a51e573de1800142f3573b3c973879ee351f1a3d..ec4de7f8c59e136f02451f4adfbe87b6d7ef36af:/fake_epoll.h

diff --git a/fake_epoll.h b/fake_epoll.h
new file mode 100644
index 0000000..d89f86a
--- /dev/null
+++ b/fake_epoll.h
@@ -0,0 +1,179 @@
+/* kludge up some limited epoll semantics using select for 2.4 kernels */
+/* $Id: fake_epoll.h,v 1.1 2005/06/04 15:42:35 bodea Exp $ */
+
+#ifndef __FAKE_EPOLL_H__
+#define __FAKE_EPOLL_H__
+
+#define EPOLLIN		0x01
+#define EPOLLOUT	0x04
+#define EPOLLERR	0x08
+#define EPOLLHUP	0x10
+
+#define EPOLL_CTL_ADD	1
+#define EPOLL_CTL_DEL	2
+#define EPOLL_CTL_MOD	3
+
+struct epoll_event {
+    uint32_t events;
+    union epoll_data {
+	void *ptr;
+	int fd;
+	uint32_t u32;
+	uint64_t u64;
+    } data;
+};
+
+int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);
+
+#ifdef FAKE_EPOLL_IMPLEMENTATION
+
+#include <sys/select.h>
+
+static fd_set _epoll_read_set;
+static fd_set _epoll_write_set;
+static int _epoll_fds;
+static struct epoll_event *_epoll_data[128];
+
+static int epoll_create(int size __attribute__ ((unused)))
+{
+    static int once = 0;
+    if (once++)
+    {
+	errno = ENFILE; /* only support one instance */
+	return -1;
+    }
+
+    FD_ZERO(&_epoll_read_set);
+    FD_ZERO(&_epoll_write_set);
+    _epoll_fds = 0;
+
+    memset(_epoll_data, 0, sizeof(_epoll_data));
+
+    return 1; /* "descriptor" */
+}
+
+int epoll_ctl(int epfd __attribute__ ((unused)), int op, int fd,
+    struct epoll_event *event)
+{
+    if (fd > (sizeof(_epoll_data)/sizeof(*_epoll_data)) - 1)
+    {
+	errno = EINVAL;
+	return -1;
+    }
+
+    switch (op)
+    {
+    case EPOLL_CTL_ADD:
+	if (event->events & EPOLLIN)
+	    FD_SET(fd, &_epoll_read_set);
+
+	if (event->events & EPOLLOUT)
+	    FD_SET(fd, &_epoll_write_set);
+
+	if (fd >= _epoll_fds)
+	    _epoll_fds = fd + 1;
+
+	if (_epoll_data[fd])
+	    free(_epoll_data[fd]);
+
+	if (!(_epoll_data[fd] = malloc(sizeof(*_epoll_data))))
+	{
+	    errno = ENOMEM;
+	    return -1;
+	}
+
+	memcpy(_epoll_data[fd], &event->data, sizeof(*_epoll_data));
+	break;
+
+    case EPOLL_CTL_MOD:
+	if (event->events & EPOLLIN)
+	    FD_SET(fd, &_epoll_read_set);
+	else
+	    FD_CLR(fd, &_epoll_read_set);
+
+	if (event->events & EPOLLOUT)
+	    FD_SET(fd, &_epoll_write_set);
+	else
+	    FD_CLR(fd, &_epoll_write_set);
+
+	memcpy(_epoll_data[fd], &event->data, sizeof(*_epoll_data));
+	break;
+
+    case EPOLL_CTL_DEL:
+	FD_CLR(fd, &_epoll_read_set);
+	FD_CLR(fd, &_epoll_write_set);
+
+	free(_epoll_data[fd]);
+	_epoll_data[fd] = 0;
+
+	if (fd == _epoll_fds - 1)
+	{
+	    _epoll_fds = 0;
+	    while (fd-- > 0)
+	    {
+		if (FD_ISSET(fd, &_epoll_read_set) ||
+		    FD_ISSET(fd, &_epoll_write_set))
+		{
+		    _epoll_fds = fd + 1;
+		    break;
+		}
+	    }
+	}
+
+	break;
+    }
+
+    return 0;
+}
+
+static int epoll_wait(int epfd __attribute__ ((unused)),
+    struct epoll_event *events, int maxevents, int timout)
+{
+    fd_set r;
+    fd_set w;
+    struct timeval t;
+    struct timeval *tp;
+    int n;
+    int e;
+    int i;
+
+    memcpy(&r, &_epoll_read_set, sizeof(r));
+    memcpy(&w, &_epoll_write_set, sizeof(w));
+
+    if (timout >= 0)
+    {
+	t.tv_sec = 0;
+	t.tv_usec = timout * 1000;
+    	tp = &t;
+    }
+    else
+	tp = 0;
+
+    n = select(_epoll_fds, &r, &w, 0, tp);
+    if (n > maxevents)
+    	n = maxevents;
+
+    for (i = e = 0; n > 0 && i < _epoll_fds; i++)
+    {
+	if (!_epoll_data[i])
+	    continue;
+
+	events[e].events = 0;
+	if (FD_ISSET(i, &r))
+	    events[e].events |= EPOLLIN;
+
+	if (FD_ISSET(i, &w))
+	    events[e].events |= EPOLLOUT;
+
+	if (events[e].events)
+	{
+	    memcpy(&events[e++].data, _epoll_data[i], sizeof(events[0].data));
+	    n--;
+	}
+    }
+
+    return e;
+}
+
+#endif /* FAKE_EPOLL_IMPLEMENTATION */
+#endif /* __FAKE_EPOLL_H__ */