libev/ev_epoll.c

#include <sys/epoll.h>

static int epoll_fd = -1;

static void
epoll_modify (int fd, int oev, int nev)
{
  int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL;

  struct epoll_event ev;
  ev.data.fd = fd;
  ev.events =
      (nev & EV_READ ? EPOLLIN : 0)
      | (nev & EV_WRITE ? EPOLLOUT : 0);

  epoll_ctl (epoll_fd, mode, fd, &ev);
}

void epoll_postfork_child (void)
{
  int fd;

  epoll_fd = epoll_create (256);
  fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);

  /* re-register interest in fds */
  for (fd = 0; fd < anfdmax; ++fd)
    if (anfds [fd].wev)
      epoll_modify (fd, EV_NONE, anfds [fd].wev);
}

static struct epoll_event *events;
static int eventmax;

static void epoll_poll (ev_tstamp timeout)
{
  int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.));
  int i;

  if (eventcnt < 0)
    return;

  for (i = 0; i < eventcnt; ++i)
    fd_event (
      events [i].data.fd,
      (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0)
      | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0)
    );

  /* if the receive array was full, increase its size */
  if (eventcnt == eventmax)
    {
      free (events);
      eventmax += eventmax >> 1;
      events = malloc (sizeof (struct epoll_event) * eventmax);
    }
}

void epoll_init (int flags)
{
  epoll_fd = epoll_create (256);

  if (epoll_fd < 0)
    return;

  fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);

  ev_method     = EVMETHOD_EPOLL;
  method_fudge  = 1e-3; /* needed to compensate for epoll returning early */
  method_modify = epoll_modify;
  method_poll   = epoll_poll;

  eventmax = 64; /* intiial number of events receivable per poll */
  events = malloc (sizeof (struct epoll_event) * eventmax);
}
Revision:	1.4
Committed:	Wed Oct 31 11:56:34 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+1 -3 lines
Log Message:	rmeove remaining debugging code
#	Content
1	#include <sys/epoll.h>
2
3	static int epoll_fd = -1;
4
5	static void
6	epoll_modify (int fd, int oev, int nev)
7	{
8	int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL;
9
10	struct epoll_event ev;
11	ev.data.fd = fd;
12	ev.events =
13	(nev & EV_READ ? EPOLLIN : 0)
14	\| (nev & EV_WRITE ? EPOLLOUT : 0);
15
16	epoll_ctl (epoll_fd, mode, fd, &ev);
17	}
18
19	void epoll_postfork_child (void)
20	{
21	int fd;
22
23	epoll_fd = epoll_create (256);
24	fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
25
26	/* re-register interest in fds */
27	for (fd = 0; fd < anfdmax; ++fd)
28	if (anfds [fd].wev)
29	epoll_modify (fd, EV_NONE, anfds [fd].wev);
30	}
31
32	static struct epoll_event *events;
33	static int eventmax;
34
35	static void epoll_poll (ev_tstamp timeout)
36	{
37	int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.));
38	int i;
39
40	if (eventcnt < 0)
41	return;
42
43	for (i = 0; i < eventcnt; ++i)
44	fd_event (
45	events [i].data.fd,
46	(events [i].events & (EPOLLOUT \| EPOLLERR \| EPOLLHUP) ? EV_WRITE : 0)
47	\| (events [i].events & (EPOLLIN \| EPOLLERR \| EPOLLHUP) ? EV_READ : 0)
48	);
49
50	/* if the receive array was full, increase its size */
51	if (eventcnt == eventmax)
52	{
53	free (events);
54	eventmax += eventmax >> 1;
55	events = malloc (sizeof (struct epoll_event) * eventmax);
56	}
57	}
58
59	void epoll_init (int flags)
60	{
61	epoll_fd = epoll_create (256);
62
63	if (epoll_fd < 0)
64	return;
65
66	fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
67
68	ev_method = EVMETHOD_EPOLL;
69	method_fudge = 1e-3; /* needed to compensate for epoll returning early */
70	method_modify = epoll_modify;
71	method_poll = epoll_poll;
72
73	eventmax = 64; /* intiial number of events receivable per poll */
74	events = malloc (sizeof (struct epoll_event) * eventmax);
75	}