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
#	User	Rev	Content
1	root	1.1	#include <sys/epoll.h>
2
3			static int epoll_fd = -1;
4
5			static void
6	root	1.2	epoll_modify (int fd, int oev, int nev)
7	root	1.1	{
8	root	1.2	int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL;
9	root	1.1
10	root	1.2	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	root	1.4	epoll_ctl (epoll_fd, mode, fd, &ev);
17	root	1.1	}
18
19			void epoll_postfork_child (void)
20			{
21	root	1.2	int fd;
22	root	1.1
23			epoll_fd = epoll_create (256);
24	root	1.3	fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
25	root	1.1
26	root	1.2	/* 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	root	1.1	}
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	root	1.2	(events [i].events & (EPOLLOUT \| EPOLLERR \| EPOLLHUP) ? EV_WRITE : 0)
47			\| (events [i].events & (EPOLLIN \| EPOLLERR \| EPOLLHUP) ? EV_READ : 0)
48	root	1.1	);
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	root	1.3	void epoll_init (int flags)
60	root	1.1	{
61			epoll_fd = epoll_create (256);
62
63			if (epoll_fd < 0)
64	root	1.3	return;
65
66			fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
67	root	1.1
68	root	1.3	ev_method = EVMETHOD_EPOLL;
69	root	1.2	method_fudge = 1e-3; /* needed to compensate for epoll returning early */
70			method_modify = epoll_modify;
71			method_poll = epoll_poll;
72	root	1.1
73			eventmax = 64; /* intiial number of events receivable per poll */
74			events = malloc (sizeof (struct epoll_event) * eventmax);
75			}