* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * $Id$
+ */
+/** @file
+ * @brief Linux epoll_*() event engine.
+ * @version $Id$
*/
#include "config.h"
#include "ircd_log.h"
#include "s_debug.h"
-#include <assert.h>
+/* #include <assert.h> -- Now using assert in ircd_log.h */
#include <errno.h>
#include <sys/types.h>
#ifdef HAVE_STDINT_H
/* Oh, did we mention that some glibc releases do not even define the
* syscall numbers? */
#if !defined(__NR_epoll_create)
-#if defined(__i386__)
-#define __NR_epoll_create 254
-#define __NR_epoll_ctl 255
-#define __NR_epoll_wait 256
-#elif defined(__ia64__)
+#if defined(__ia64__)
#define __NR_epoll_create 1243
#define __NR_epoll_ctl 1244
#define __NR_epoll_wait 1245
#define __NR_epoll_create 214
#define __NR_epoll_ctl 233
#define __NR_epoll_wait 232
+#elif defined(__sparc64__) || defined(__sparc__)
+#define __NR_epoll_create 193
+#define __NR_epoll_ctl 194
+#define __NR_epoll_wait 195
+#elif defined(__s390__) || defined(__m68k__)
+#define __NR_epoll_create 249
+#define __NR_epoll_ctl 250
+#define __NR_epoll_wait 251
+#elif defined(__ppc64__) || defined(__ppc__)
+#define __NR_epoll_create 236
+#define __NR_epoll_ctl 237
+#define __NR_epoll_wait 238
+#elif defined(__parisc__) || defined(__arm26__) || defined(__arm__)
+#define __NR_epoll_create 224
+#define __NR_epoll_ctl 225
+#define __NR_epoll_wait 226
+#elif defined(__alpha__)
+#define __NR_epoll_create 407
+#define __NR_epoll_ctl 408
+#define __NR_epoll_wait 409
+#elif defined(__sh64__)
+#define __NR_epoll_create 282
+#define __NR_epoll_ctl 283
+#define __NR_epoll_wait 284
+#elif defined(__i386__) || defined(__sh__) || defined(__m32r__) || defined(__h8300__) || defined(__frv__)
+#define __NR_epoll_create 254
+#define __NR_epoll_ctl 255
+#define __NR_epoll_wait 256
#else /* cpu types */
#error No system call numbers defined for epoll family.
#endif /* cpu types */
#endif /* epoll_create defined as stub */
-#define EPOLL_ERROR_THRESHOLD 20 /* after 20 epoll errors, restart */
-#define ERROR_EXPIRE_TIME 3600 /* expire errors after an hour */
+#define EPOLL_ERROR_THRESHOLD 20 /**< after 20 epoll errors, restart */
+#define ERROR_EXPIRE_TIME 3600 /**< expire errors after an hour */
+/** File descriptor for epoll pseudo-file. */
static int epoll_fd;
+/** Number of recent epoll errors. */
static int errors;
+/** Periodic timer to forget errors. */
static struct Timer clear_error;
+/** Current array of event descriptors. */
+static struct epoll_event *events;
+/** Number of ::events elements that have been populated. */
+static int events_used;
-/* decrements the error count once per hour */
+/** Decrement the error count (once per hour).
+ * @param[in] ev Expired timer event (ignored).
+ */
static void
error_clear(struct Event *ev)
{
timer_del(ev_timer(ev));
}
-/* initialize the epoll engine */
+/** Initialize the epoll engine.
+ * @param[in] max_sockets Maximum number of file descriptors to support.
+ * @return Non-zero on success, or zero on failure.
+ */
static int
engine_init(int max_sockets)
{
return 1;
}
+/** Set events for a particular socket.
+ * @param[in] sock Socket to calculate events for.
+ * @param[in] state Current socket state.
+ * @param[in] events User-specified event interest list.
+ * @param[out] evt epoll event structure for socket.
+ */
static void
set_events(struct Socket *sock, enum SocketState state, unsigned int events, struct epoll_event *evt)
{
}
}
+/** Add a socket to the event engine.
+ * @param[in] sock Socket to add to engine.
+ * @return Non-zero on success, or zero on error.
+ */
static int
engine_add(struct Socket *sock)
{
return 1;
}
+/** Handle state transition for a socket.
+ * @param[in] sock Socket changing state.
+ * @param[in] new_state New state for socket.
+ */
static void
engine_set_state(struct Socket *sock, enum SocketState new_state)
{
event_generate(ET_ERROR, sock, errno);
}
+/** Handle change to preferred socket events.
+ * @param[in] sock Socket getting new interest list.
+ * @param[in] new_events New set of interesting events for socket.
+ */
static void
engine_set_events(struct Socket *sock, unsigned new_events)
{
event_generate(ET_ERROR, sock, errno);
}
+/** Remove a socket from the event engine.
+ * @param[in] sock Socket being destroyed.
+ */
static void
engine_delete(struct Socket *sock)
{
- struct epoll_event evt;
+ int ii;
assert(0 != sock);
- memset(&evt, 0, sizeof(evt));
Debug((DEBUG_ENGINE, "epoll: Deleting socket %d [%p], state %s",
s_fd(sock), sock, state_to_name(s_state(sock))));
- if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, s_fd(sock), &evt) < 0)
- log_write(LS_SOCKET, L_WARNING, 0,
- "Unable to delete epoll item for socket %d", s_fd(sock));
+ /* Drop any unprocessed events citing this socket. */
+ for (ii = 0; ii < events_used; ii++) {
+ if (events[ii].data.ptr == sock) {
+ events[ii] = events[--events_used];
+ }
+ }
}
+/** Run engine event loop.
+ * @param[in] gen Lists of generators of various types.
+ */
static void
engine_loop(struct Generators *gen)
{
- struct epoll_event *events;
+ struct epoll_event *evt;
struct Socket *sock;
- size_t codesize;
- int events_count, i, wait, nevs, errcode;
+ socklen_t codesize;
+ int events_count, tmp, wait, errcode;
if ((events_count = feature_int(FEAT_POLLS_PER_LOOP)) < 20)
events_count = 20;
events = MyMalloc(sizeof(events[0]) * events_count);
while (running) {
- if ((i = feature_int(FEAT_POLLS_PER_LOOP)) >= 20 && i != events_count) {
- events = MyRealloc(events, sizeof(events[0]) * i);
- events_count = i;
+ if ((tmp = feature_int(FEAT_POLLS_PER_LOOP)) >= 20 && tmp != events_count) {
+ events = MyRealloc(events, sizeof(events[0]) * tmp);
+ events_count = tmp;
}
wait = timer_next(gen) ? (timer_next(gen) - CurrentTime) * 1000 : -1;
- Debug((DEBUG_INFO, "epoll: delay: %d (%d) %d", timer_next(gen),
+ Debug((DEBUG_ENGINE, "epoll: delay: %d (%d) %d", timer_next(gen),
CurrentTime, wait));
- nevs = epoll_wait(epoll_fd, events, events_count, wait);
+ events_used = epoll_wait(epoll_fd, events, events_count, wait);
CurrentTime = time(0);
- if (nevs < 0) {
+ if (events_used < 0) {
if (errno != EINTR) {
log_write(LS_SOCKET, L_ERROR, 0, "epoll() error: %m");
if (!errors++)
continue;
}
- for (i = 0; i < nevs; i++) {
- if (!(sock = events[i].data.ptr))
+ while (events_used > 0) {
+ evt = &events[--events_used];
+ if (!(sock = evt->data.ptr))
continue;
gen_ref_inc(sock);
Debug((DEBUG_ENGINE,
sock, s_fd(sock), state_to_name(s_state(sock)),
sock_flags(s_events(sock))));
- if (events[i].events & EPOLLERR) {
+ if (evt->events & EPOLLERR) {
errcode = 0;
codesize = sizeof(errcode);
if (getsockopt(s_fd(sock), SOL_SOCKET, SO_ERROR, &errcode,
gen_ref_dec(sock);
continue;
}
- }
-
- switch (s_state(sock)) {
+ } else if (evt->events & EPOLLHUP) {
+ event_generate(ET_EOF, sock, 0);
+ } else switch (s_state(sock)) {
case SS_CONNECTING:
- if (events[i].events & EPOLLOUT) /* connection completed */
+ if (evt->events & EPOLLOUT) /* connection completed */
event_generate(ET_CONNECT, sock, 0);
break;
case SS_LISTENING:
- if (events[i].events & EPOLLIN) /* incoming connection */
+ if (evt->events & EPOLLIN) /* incoming connection */
event_generate(ET_ACCEPT, sock, 0);
break;
case SS_NOTSOCK:
case SS_CONNECTED:
- if (events[i].events & EPOLLIN)
- event_generate((events[i].events & EPOLLHUP) ? ET_EOF : ET_READ, sock, 0);
- if (events[i].events & EPOLLOUT)
- event_generate(ET_WRITE, sock, 0);
- break;
-
case SS_DATAGRAM:
case SS_CONNECTDG:
- if (events[i].events & EPOLLIN)
+ if (evt->events & EPOLLIN)
event_generate(ET_READ, sock, 0);
- if (events[i].events & EPOLLOUT)
+ if (evt->events & EPOLLOUT)
event_generate(ET_WRITE, sock, 0);
break;
}
}
timer_run();
}
+ MyFree(events);
}
+/** Descriptor for epoll event engine. */
struct Engine engine_epoll = {
"epoll()",
engine_init,
projects / ircu2.10.12-pk.git / blobdiff