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authorjames <james@e7ae566f-a301-0410-adde-c780ea21d3b5>2005-09-26 05:28:27 +0000
committerjames <james@e7ae566f-a301-0410-adde-c780ea21d3b5>2005-09-26 05:28:27 +0000
commit6fbf66fad3367b24fd6743bcd50254902fd9c8d5 (patch)
tree9802876e3771744eead18917bb47ff6e90ac39f5 /event.c
downloadopenvpn-6fbf66fad3367b24fd6743bcd50254902fd9c8d5.tar.xz
This is the start of the BETA21 branch.
It includes the --topology feature, and TAP-Win32 driver changes to allow non-admin access. git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@580 e7ae566f-a301-0410-adde-c780ea21d3b5
Diffstat (limited to 'event.c')
-rw-r--r--event.c1061
1 files changed, 1061 insertions, 0 deletions
diff --git a/event.c b/event.c
new file mode 100644
index 0000000..0d2c096
--- /dev/null
+++ b/event.c
@@ -0,0 +1,1061 @@
+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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 (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifdef WIN32
+#include "config-win32.h"
+#else
+#include "config.h"
+#endif
+
+#include "syshead.h"
+
+#include "buffer.h"
+#include "error.h"
+#include "integer.h"
+#include "event.h"
+
+#include "memdbg.h"
+
+/*
+ * Some OSes will prefer select() over poll()
+ * when both are available.
+ */
+#if defined(TARGET_DARWIN)
+#define SELECT_PREFERRED_OVER_POLL
+#endif
+
+/*
+ * All non-windows OSes are assumed to have select()
+ */
+#ifdef WIN32
+#define SELECT 0
+#else
+#define SELECT 1
+#endif
+
+/*
+ * This should be set to the highest file descriptor
+ * which can be used in one of the FD_ macros.
+ */
+#ifdef FD_SETSIZE
+#define SELECT_MAX_FDS FD_SETSIZE
+#else
+#define SELECT_MAX_FDS 256
+#endif
+
+static inline int
+tv_to_ms_timeout (const struct timeval *tv)
+{
+ if (tv->tv_sec == 0 && tv->tv_usec == 0)
+ return 0;
+ else
+ return max_int (tv->tv_sec * 1000 + (tv->tv_usec + 500) / 1000, 1);
+}
+
+#ifdef WIN32
+
+struct we_set
+{
+ struct event_set_functions func;
+ bool fast;
+ HANDLE *events;
+ struct event_set_return *esr;
+ int n_events;
+ int capacity;
+};
+
+static inline void
+we_set_event (struct we_set *wes, int i, event_t event, unsigned int rwflags, void *arg)
+{
+ ASSERT (i >= 0 && i < wes->capacity);
+
+ if (rwflags == EVENT_READ)
+ {
+ ASSERT (event->read != NULL);
+ wes->events[i] = event->read;
+ }
+ else if (rwflags == EVENT_WRITE)
+ {
+ ASSERT (event->write != NULL);
+ wes->events[i] = event->write;
+ }
+ else
+ msg (M_FATAL, "fatal error in we_set_events: rwflags=%d", rwflags);
+
+ wes->esr[i].rwflags = rwflags;
+ wes->esr[i].arg = arg;
+}
+
+static inline bool
+we_append_event (struct we_set *wes, event_t event, unsigned int rwflags, void *arg)
+{
+ if (rwflags & EVENT_WRITE)
+ {
+ if (wes->n_events < wes->capacity)
+ {
+ we_set_event (wes, wes->n_events, event, EVENT_WRITE, arg);
+ ++wes->n_events;
+ }
+ else
+ return false;
+ }
+ if (rwflags & EVENT_READ)
+ {
+ if (wes->n_events < wes->capacity)
+ {
+ we_set_event (wes, wes->n_events, event, EVENT_READ, arg);
+ ++wes->n_events;
+ }
+ else
+ return false;
+ }
+ return true;
+}
+
+static void
+we_del_event (struct we_set *wes, event_t event)
+{
+ int i, j = 0;
+ const int len = wes->n_events;
+
+ for (i = 0; i < len; ++i)
+ {
+ const HANDLE h = wes->events[i];
+ if (h == event->read || h == event->write)
+ --wes->n_events;
+ else
+ {
+ if (i != j)
+ {
+ wes->events[j] = wes->events[i];
+ wes->esr[j] = wes->esr[i];
+ }
+ ++j;
+ }
+ }
+}
+
+static void
+we_del_index (struct we_set *wes, int index)
+{
+ int i;
+ ASSERT (index >= 0 && index < wes->n_events);
+ for (i = index; i < wes->n_events - 1; ++i)
+ {
+ wes->events[i] = wes->events[i+1];
+ wes->esr[i] = wes->esr[i+1];
+ }
+ --wes->n_events;
+}
+
+static void
+we_get_rw_indices (struct we_set *wes, event_t event, int *ri, int *wi)
+{
+ int i;
+ *ri = *wi = -1;
+ for (i = 0; i < wes->n_events; ++i)
+ {
+ const HANDLE h = wes->events[i];
+ if (h == event->read)
+ {
+ ASSERT (*ri == -1);
+ *ri = i;
+ }
+ else if (h == event->write)
+ {
+ ASSERT (*wi == -1);
+ *wi = i;
+ }
+ }
+}
+
+static void
+we_free (struct event_set *es)
+{
+ struct we_set *wes = (struct we_set *) es;
+ free (wes->events);
+ free (wes->esr);
+ free (wes);
+}
+
+static void
+we_reset (struct event_set *es)
+{
+ struct we_set *wes = (struct we_set *) es;
+ ASSERT (wes->fast);
+ wes->n_events = 0;
+}
+
+static void
+we_del (struct event_set *es, event_t event)
+{
+ struct we_set *wes = (struct we_set *) es;
+ ASSERT (!wes->fast);
+ we_del_event (wes, event);
+}
+
+static void
+we_ctl (struct event_set *es, event_t event, unsigned int rwflags, void *arg)
+{
+ struct we_set *wes = (struct we_set *) es;
+
+ dmsg (D_EVENT_WAIT, "WE_CTL n=%d ev=0x%08x rwflags=0x%04x arg=" ptr_format,
+ wes->n_events,
+ (unsigned int)event,
+ rwflags,
+ (ptr_type)arg);
+
+ if (wes->fast)
+ {
+ if (!we_append_event (wes, event, rwflags, arg))
+ goto err;
+ }
+ else
+ {
+ int ri, wi;
+ int one = -1;
+ int n = 0;
+
+ we_get_rw_indices (wes, event, &ri, &wi);
+ if (wi >= 0)
+ {
+ one = wi;
+ ++n;
+ }
+ if (ri >= 0)
+ {
+ one = ri;
+ ++n;
+ }
+ switch (rwflags)
+ {
+ case 0:
+ switch (n)
+ {
+ case 0:
+ break;
+ case 1:
+ we_del_index (wes, one);
+ break;
+ case 2:
+ we_del_event (wes, event);
+ break;
+ default:
+ ASSERT (0);
+ }
+ break;
+ case EVENT_READ:
+ switch (n)
+ {
+ case 0:
+ if (!we_append_event (wes, event, EVENT_READ, arg))
+ goto err;
+ break;
+ case 1:
+ we_set_event (wes, one, event, EVENT_READ, arg);
+ break;
+ case 2:
+ we_del_index (wes, wi);
+ break;
+ default:
+ ASSERT (0);
+ }
+ break;
+ case EVENT_WRITE:
+ switch (n)
+ {
+ case 0:
+ if (!we_append_event (wes, event, EVENT_WRITE, arg))
+ goto err;
+ break;
+ case 1:
+ we_set_event (wes, one, event, EVENT_WRITE, arg);
+ break;
+ case 2:
+ we_del_index (wes, ri);
+ break;
+ default:
+ ASSERT (0);
+ }
+ break;
+ case EVENT_READ|EVENT_WRITE:
+ switch (n)
+ {
+ case 0:
+ if (!we_append_event (wes, event, EVENT_READ|EVENT_WRITE, arg))
+ goto err;
+ break;
+ case 1:
+ if (ri == -1)
+ {
+ ASSERT (wi != -1);
+ if (!we_append_event (wes, event, EVENT_READ, arg))
+ goto err;
+ }
+ else if (wi == -1)
+ {
+ if (!we_append_event (wes, event, EVENT_WRITE, arg))
+ goto err;
+ }
+ else
+ ASSERT (0);
+ break;
+ case 2:
+ break;
+ default:
+ ASSERT (0);
+ }
+ break;
+ default:
+ msg (M_FATAL, "fatal error in we_ctl: rwflags=%d", rwflags);
+ }
+ }
+ return;
+
+ err:
+ msg (D_EVENT_ERRORS, "Error: Windows resource limit WSA_MAXIMUM_WAIT_EVENTS (%d) has been exceeded", WSA_MAXIMUM_WAIT_EVENTS);
+}
+
+static int
+we_wait (struct event_set *es, const struct timeval *tv, struct event_set_return *out, int outlen)
+{
+ struct we_set *wes = (struct we_set *) es;
+ const int timeout = tv_to_ms_timeout (tv);
+ DWORD status;
+
+ dmsg (D_EVENT_WAIT, "WE_WAIT enter n=%d to=%d", wes->n_events, timeout);
+
+#ifdef ENABLE_DEBUG
+ if (check_debug_level (D_EVENT_WAIT)) {
+ int i;
+ for (i = 0; i < wes->n_events; ++i)
+ dmsg (D_EVENT_WAIT, "[%d] ev=0x%08x rwflags=0x%04x arg=" ptr_format,
+ i,
+ (unsigned int)wes->events[i],
+ wes->esr[i].rwflags,
+ (ptr_type)wes->esr[i].arg);
+ }
+#endif
+
+ /*
+ * First poll our event list with 0 timeout
+ */
+ status = WSAWaitForMultipleEvents(
+ (DWORD) wes->n_events,
+ wes->events,
+ FALSE,
+ (DWORD) 0,
+ FALSE);
+
+ /*
+ * If at least one event is already set, we must
+ * individually poll the whole list.
+ */
+ if (status >= WSA_WAIT_EVENT_0 && status < WSA_WAIT_EVENT_0 + (DWORD) wes->n_events)
+ {
+ int i;
+ int j = 0;
+ for (i = 0; i < wes->n_events; ++i)
+ {
+ if (j >= outlen)
+ break;
+ if (WaitForSingleObject (wes->events[i], 0) == WAIT_OBJECT_0)
+ {
+ *out = wes->esr[i];
+ dmsg (D_EVENT_WAIT, "WE_WAIT leave [%d,%d] rwflags=0x%04x arg=" ptr_format,
+ i, j, out->rwflags, (ptr_type)out->arg);
+ ++j;
+ ++out;
+ }
+ }
+ return j;
+ }
+ else
+ {
+ /*
+ * If caller specified timeout > 0, we know at this point
+ * that no events are set, so wait only for the first event
+ * (or timeout) and return at most one event_set_return object.
+ *
+ * If caller specified timeout == 0, the second call to
+ * WSAWaitForMultipleEvents would be redundant -- just
+ * return 0 indicating timeout.
+ */
+ if (timeout > 0)
+ status = WSAWaitForMultipleEvents(
+ (DWORD) wes->n_events,
+ wes->events,
+ FALSE,
+ (DWORD) timeout,
+ FALSE);
+
+ if (outlen >= 1 && status >= WSA_WAIT_EVENT_0 && status < WSA_WAIT_EVENT_0 + (DWORD) wes->n_events)
+ {
+ *out = wes->esr[status - WSA_WAIT_EVENT_0];
+ dmsg (D_EVENT_WAIT, "WE_WAIT leave rwflags=0x%04x arg=" ptr_format,
+ out->rwflags, (ptr_type)out->arg);
+ return 1;
+ }
+ else if (status == WSA_WAIT_TIMEOUT)
+ return 0;
+ else
+ return -1;
+ }
+}
+
+static struct event_set *
+we_init (int *maxevents, unsigned int flags)
+{
+ struct we_set *wes;
+
+ dmsg (D_EVENT_WAIT, "WE_INIT maxevents=%d flags=0x%08x", *maxevents, flags);
+
+ ALLOC_OBJ_CLEAR (wes, struct we_set);
+
+ /* set dispatch functions */
+ wes->func.free = we_free;
+ wes->func.reset = we_reset;
+ wes->func.del = we_del;
+ wes->func.ctl = we_ctl;
+ wes->func.wait = we_wait;
+
+ if (flags & EVENT_METHOD_FAST)
+ wes->fast = true;
+ wes->n_events = 0;
+
+ /* Figure our event capacity */
+ ASSERT (*maxevents > 0);
+ wes->capacity = min_int (*maxevents * 2, WSA_MAXIMUM_WAIT_EVENTS);
+ *maxevents = min_int (*maxevents, WSA_MAXIMUM_WAIT_EVENTS);
+
+ /* Allocate space for Win32 event handles */
+ ALLOC_ARRAY_CLEAR (wes->events, HANDLE, wes->capacity);
+
+ /* Allocate space for event_set_return objects */
+ ALLOC_ARRAY_CLEAR (wes->esr, struct event_set_return, wes->capacity);
+
+ dmsg (D_EVENT_WAIT, "WE_INIT maxevents=%d capacity=%d",
+ *maxevents, wes->capacity);
+
+ return (struct event_set *) wes;
+}
+
+#endif /* WIN32 */
+
+#if EPOLL
+
+struct ep_set
+{
+ struct event_set_functions func;
+ bool fast;
+ int epfd;
+ int maxevents;
+ struct epoll_event *events;
+};
+
+static void
+ep_free (struct event_set *es)
+{
+ struct ep_set *eps = (struct ep_set *) es;
+ close (eps->epfd);
+ free (eps->events);
+ free (eps);
+}
+
+static void
+ep_reset (struct event_set *es)
+{
+ const struct ep_set *eps = (struct ep_set *) es;
+ ASSERT (eps->fast);
+}
+
+static void
+ep_del (struct event_set *es, event_t event)
+{
+ struct epoll_event ev;
+ struct ep_set *eps = (struct ep_set *) es;
+
+ dmsg (D_EVENT_WAIT, "EP_DEL ev=%d", (int)event);
+
+ ASSERT (!eps->fast);
+ CLEAR (ev);
+ epoll_ctl (eps->epfd, EPOLL_CTL_DEL, event, &ev);
+}
+
+static void
+ep_ctl (struct event_set *es, event_t event, unsigned int rwflags, void *arg)
+{
+ struct ep_set *eps = (struct ep_set *) es;
+ struct epoll_event ev;
+
+ CLEAR (ev);
+
+ ev.data.ptr = arg;
+ if (rwflags & EVENT_READ)
+ ev.events |= EPOLLIN;
+ if (rwflags & EVENT_WRITE)
+ ev.events |= EPOLLOUT;
+
+ dmsg (D_EVENT_WAIT, "EP_CTL fd=%d rwflags=0x%04x ev=0x%08x arg=" ptr_format,
+ (int)event,
+ rwflags,
+ (unsigned int)ev.events,
+ (ptr_type)ev.data.ptr);
+
+ if (epoll_ctl (eps->epfd, EPOLL_CTL_MOD, event, &ev) < 0)
+ {
+ if (errno == ENOENT)
+ {
+ if (epoll_ctl (eps->epfd, EPOLL_CTL_ADD, event, &ev) < 0)
+ msg (M_ERR, "EVENT: epoll_ctl EPOLL_CTL_ADD failed");
+ }
+ else
+ msg (M_ERR, "EVENT: epoll_ctl EPOLL_CTL_MOD failed");
+ }
+}
+
+static int
+ep_wait (struct event_set *es, const struct timeval *tv, struct event_set_return *out, int outlen)
+{
+ struct ep_set *eps = (struct ep_set *) es;
+ int stat;
+
+ if (outlen > eps->maxevents)
+ outlen = eps->maxevents;
+
+ stat = epoll_wait (eps->epfd, eps->events, outlen, tv_to_ms_timeout (tv));
+ ASSERT (stat <= outlen);
+
+ if (stat > 0)
+ {
+ int i;
+ const struct epoll_event *ev = eps->events;
+ struct event_set_return *esr = out;
+ for (i = 0; i < stat; ++i)
+ {
+ esr->rwflags = 0;
+ if (ev->events & (EPOLLIN|EPOLLPRI|EPOLLERR))
+ esr->rwflags |= EVENT_READ;
+ if (ev->events & EPOLLOUT)
+ esr->rwflags |= EVENT_WRITE;
+ esr->arg = ev->data.ptr;
+ dmsg (D_EVENT_WAIT, "EP_WAIT[%d] rwflags=0x%04x ev=0x%08x arg=" ptr_format,
+ i, esr->rwflags, ev->events, (ptr_type)ev->data.ptr);
+ ++ev;
+ ++esr;
+ }
+ }
+ return stat;
+}
+
+static struct event_set *
+ep_init (int *maxevents, unsigned int flags)
+{
+ struct ep_set *eps;
+ int fd;
+
+ dmsg (D_EVENT_WAIT, "EP_INIT maxevents=%d flags=0x%08x", *maxevents, flags);
+
+ /* open epoll file descriptor */
+ fd = epoll_create (*maxevents);
+ if (fd < 0)
+ return NULL;
+
+ ALLOC_OBJ_CLEAR (eps, struct ep_set);
+
+ /* set dispatch functions */
+ eps->func.free = ep_free;
+ eps->func.reset = ep_reset;
+ eps->func.del = ep_del;
+ eps->func.ctl = ep_ctl;
+ eps->func.wait = ep_wait;
+
+ /* fast method ("sort of") corresponds to epoll one-shot */
+ if (flags & EVENT_METHOD_FAST)
+ eps->fast = true;
+
+ /* allocate space for epoll_wait return */
+ ASSERT (*maxevents > 0);
+ eps->maxevents = *maxevents;
+ ALLOC_ARRAY_CLEAR (eps->events, struct epoll_event, eps->maxevents);
+
+ /* set epoll control fd */
+ eps->epfd = fd;
+
+ return (struct event_set *) eps;
+}
+#endif /* EPOLL */
+
+#if POLL
+
+struct po_set
+{
+ struct event_set_functions func;
+ bool fast;
+ struct pollfd *events;
+ void **args;
+ int n_events;
+ int capacity;
+};
+
+static void
+po_free (struct event_set *es)
+{
+ struct po_set *pos = (struct po_set *) es;
+ free (pos->events);
+ free (pos->args);
+ free (pos);
+}
+
+static void
+po_reset (struct event_set *es)
+{
+ struct po_set *pos = (struct po_set *) es;
+ ASSERT (pos->fast);
+ pos->n_events = 0;
+}
+
+static void
+po_del (struct event_set *es, event_t event)
+{
+ struct po_set *pos = (struct po_set *) es;
+ int i;
+
+ dmsg (D_EVENT_WAIT, "PO_DEL ev=%d", (int)event);
+
+ ASSERT (!pos->fast);
+ for (i = 0; i < pos->n_events; ++i)
+ {
+ if (pos->events[i].fd == event)
+ {
+ int j;
+ for (j = i; j < pos->n_events - 1; ++j)
+ {
+ pos->events[j] = pos->events[j+1];
+ pos->args[j] = pos->args[j+1];
+ }
+ --pos->n_events;
+ break;
+ }
+ }
+}
+
+static inline void
+po_set_pollfd_events (struct pollfd *pfdp, unsigned int rwflags)
+{
+ pfdp->events = 0;
+ if (rwflags & EVENT_WRITE)
+ pfdp->events |= POLLOUT;
+ if (rwflags & EVENT_READ)
+ pfdp->events |= (POLLIN|POLLPRI);
+}
+
+static inline bool
+po_append_event (struct po_set *pos, event_t event, unsigned int rwflags, void *arg)
+{
+ if (pos->n_events < pos->capacity)
+ {
+ struct pollfd *pfdp = &pos->events[pos->n_events];
+ pfdp->fd = event;
+ pos->args[pos->n_events] = arg;
+ po_set_pollfd_events (pfdp, rwflags);
+ ++pos->n_events;
+ return true;
+ }
+ else
+ return false;
+}
+
+static void
+po_ctl (struct event_set *es, event_t event, unsigned int rwflags, void *arg)
+{
+ struct po_set *pos = (struct po_set *) es;
+
+ dmsg (D_EVENT_WAIT, "PO_CTL rwflags=0x%04x ev=%d arg=" ptr_format,
+ rwflags, (int)event, (ptr_type)arg);
+
+ if (pos->fast)
+ {
+ if (!po_append_event (pos, event, rwflags, arg))
+ goto err;
+ }
+ else
+ {
+ int i;
+ for (i = 0; i < pos->n_events; ++i)
+ {
+ struct pollfd *pfdp = &pos->events[i];
+ if (pfdp->fd == event)
+ {
+ pos->args[i] = arg;
+ po_set_pollfd_events (pfdp, rwflags);
+ goto done;
+ }
+ }
+ if (!po_append_event (pos, event, rwflags, arg))
+ goto err;
+ }
+
+ done:
+ return;
+
+ err:
+ msg (D_EVENT_ERRORS, "Error: poll: too many I/O wait events");
+}
+
+static int
+po_wait (struct event_set *es, const struct timeval *tv, struct event_set_return *out, int outlen)
+{
+ struct po_set *pos = (struct po_set *) es;
+ int stat;
+
+ stat = poll (pos->events, pos->n_events, tv_to_ms_timeout (tv));
+
+ ASSERT (stat <= pos->n_events);
+
+ if (stat > 0)
+ {
+ int i, j=0;
+ const struct pollfd *pfdp = pos->events;
+ for (i = 0; i < pos->n_events && j < outlen; ++i)
+ {
+ if (pfdp->revents & (POLLIN|POLLPRI|POLLERR|POLLHUP|POLLOUT))
+ {
+ out->rwflags = 0;
+ if (pfdp->revents & (POLLIN|POLLPRI|POLLERR|POLLHUP))
+ out->rwflags |= EVENT_READ;
+ if (pfdp->revents & POLLOUT)
+ out->rwflags |= EVENT_WRITE;
+ out->arg = pos->args[i];
+ dmsg (D_EVENT_WAIT, "PO_WAIT[%d,%d] fd=%d rev=0x%08x rwflags=0x%04x arg=" ptr_format " %s",
+ i, j, pfdp->fd, pfdp->revents, out->rwflags, (ptr_type)out->arg, pos->fast ? "" : "[scalable]");
+ ++out;
+ ++j;
+ }
+ else if (pfdp->revents)
+ {
+ msg (D_EVENT_ERRORS, "Error: poll: unknown revents=0x%04x", (unsigned int)pfdp->revents);
+ }
+ ++pfdp;
+ }
+ return j;
+ }
+ return stat;
+}
+
+static struct event_set *
+po_init (int *maxevents, unsigned int flags)
+{
+ struct po_set *pos;
+
+ dmsg (D_EVENT_WAIT, "PO_INIT maxevents=%d flags=0x%08x", *maxevents, flags);
+
+ ALLOC_OBJ_CLEAR (pos, struct po_set);
+
+ /* set dispatch functions */
+ pos->func.free = po_free;
+ pos->func.reset = po_reset;
+ pos->func.del = po_del;
+ pos->func.ctl = po_ctl;
+ pos->func.wait = po_wait;
+
+ if (flags & EVENT_METHOD_FAST)
+ pos->fast = true;
+
+ pos->n_events = 0;
+
+ /* Figure our event capacity */
+ ASSERT (*maxevents > 0);
+ pos->capacity = *maxevents;
+
+ /* Allocate space for pollfd structures to be passed to poll() */
+ ALLOC_ARRAY_CLEAR (pos->events, struct pollfd, pos->capacity);
+
+ /* Allocate space for event_set_return objects */
+ ALLOC_ARRAY_CLEAR (pos->args, void *, pos->capacity);
+
+ return (struct event_set *) pos;
+}
+#endif /* POLL */
+
+#if SELECT
+
+struct se_set
+{
+ struct event_set_functions func;
+ bool fast;
+ fd_set readfds;
+ fd_set writefds;
+ void **args; /* allocated to capacity size */
+ int maxfd; /* largest fd seen so far, always < capacity */
+ int capacity; /* fixed largest fd + 1 */
+};
+
+static void
+se_free (struct event_set *es)
+{
+ struct se_set *ses = (struct se_set *) es;
+ free (ses->args);
+ free (ses);
+}
+
+static void
+se_reset (struct event_set *es)
+{
+ struct se_set *ses = (struct se_set *) es;
+ int i;
+ ASSERT (ses->fast);
+
+ dmsg (D_EVENT_WAIT, "SE_RESET");
+
+ FD_ZERO (&ses->readfds);
+ FD_ZERO (&ses->writefds);
+ for (i = 0; i <= ses->maxfd; ++i)
+ ses->args[i] = NULL;
+ ses->maxfd = -1;
+}
+
+static void
+se_del (struct event_set *es, event_t event)
+{
+ struct se_set *ses = (struct se_set *) es;
+ ASSERT (!ses->fast);
+
+ dmsg (D_EVENT_WAIT, "SE_DEL ev=%d", (int)event);
+
+ if (event >= 0 && event < ses->capacity)
+ {
+ FD_CLR (event, &ses->readfds);
+ FD_CLR (event, &ses->writefds);
+ ses->args[event] = NULL;
+ }
+ else
+ msg (D_EVENT_ERRORS, "Error: select/se_del: too many I/O wait events");
+ return;
+}
+
+static void
+se_ctl (struct event_set *es, event_t event, unsigned int rwflags, void *arg)
+{
+ struct se_set *ses = (struct se_set *) es;
+
+ dmsg (D_EVENT_WAIT, "SE_CTL rwflags=0x%04x ev=%d fast=%d cap=%d maxfd=%d arg=" ptr_format,
+ rwflags, (int)event, (int)ses->fast, ses->capacity, ses->maxfd, (ptr_type)arg);
+
+ if (event >= 0 && event < ses->capacity)
+ {
+ ses->maxfd = max_int (event, ses->maxfd);
+ ses->args[event] = arg;
+ if (ses->fast)
+ {
+ if (rwflags & EVENT_READ)
+ FD_SET (event, &ses->readfds);
+ if (rwflags & EVENT_WRITE)
+ FD_SET (event, &ses->writefds);
+ }
+ else
+ {
+ if (rwflags & EVENT_READ)
+ FD_SET (event, &ses->readfds);
+ else
+ FD_CLR (event, &ses->readfds);
+ if (rwflags & EVENT_WRITE)
+ FD_SET (event, &ses->writefds);
+ else
+ FD_CLR (event, &ses->writefds);
+ }
+ }
+ else
+ {
+ msg (D_EVENT_ERRORS, "Error: select: too many I/O wait events, fd=%d cap=%d",
+ (int) event,
+ ses->capacity);
+ }
+}
+
+static int
+se_wait_return (struct se_set *ses,
+ fd_set *read,
+ fd_set *write,
+ struct event_set_return *out,
+ int outlen)
+{
+ int i, j = 0;
+ for (i = 0; i <= ses->maxfd && j < outlen; ++i)
+ {
+ const bool r = FD_ISSET (i, read);
+ const bool w = FD_ISSET (i, write);
+ if (r || w)
+ {
+ out->rwflags = 0;
+ if (r)
+ out->rwflags |= EVENT_READ;
+ if (w)
+ out->rwflags |= EVENT_WRITE;
+ out->arg = ses->args[i];
+ dmsg (D_EVENT_WAIT, "SE_WAIT[%d,%d] rwflags=0x%04x arg=" ptr_format,
+ i, j, out->rwflags, (ptr_type)out->arg);
+ ++out;
+ ++j;
+ }
+ }
+ return j;
+}
+
+static int
+se_wait_fast (struct event_set *es, const struct timeval *tv, struct event_set_return *out, int outlen)
+{
+ struct se_set *ses = (struct se_set *) es;
+ struct timeval tv_tmp = *tv;
+ int stat;
+
+ dmsg (D_EVENT_WAIT, "SE_WAIT_FAST maxfd=%d tv=%d/%d",
+ ses->maxfd,
+ (int)tv_tmp.tv_sec,
+ (int)tv_tmp.tv_usec);
+
+ stat = select (ses->maxfd + 1, &ses->readfds, &ses->writefds, NULL, &tv_tmp);
+
+ if (stat > 0)
+ stat = se_wait_return (ses, &ses->readfds, &ses->writefds, out, outlen);
+
+ return stat;
+}
+
+static int
+se_wait_scalable (struct event_set *es, const struct timeval *tv, struct event_set_return *out, int outlen)
+{
+ struct se_set *ses = (struct se_set *) es;
+ struct timeval tv_tmp = *tv;
+ fd_set read = ses->readfds;
+ fd_set write = ses->writefds;
+ int stat;
+
+ dmsg (D_EVENT_WAIT, "SE_WAIT_SCALEABLE maxfd=%d tv=%d/%d",
+ ses->maxfd, (int)tv_tmp.tv_sec, (int)tv_tmp.tv_usec);
+
+ stat = select (ses->maxfd + 1, &read, &write, NULL, &tv_tmp);
+
+ if (stat > 0)
+ stat = se_wait_return (ses, &read, &write, out, outlen);
+
+ return stat;
+}
+
+static struct event_set *
+se_init (int *maxevents, unsigned int flags)
+{
+ struct se_set *ses;
+
+ dmsg (D_EVENT_WAIT, "SE_INIT maxevents=%d flags=0x%08x", *maxevents, flags);
+
+ ALLOC_OBJ_CLEAR (ses, struct se_set);
+
+ /* set dispatch functions */
+ ses->func.free = se_free;
+ ses->func.reset = se_reset;
+ ses->func.del = se_del;
+ ses->func.ctl = se_ctl;
+ ses->func.wait = se_wait_scalable;
+
+ if (flags & EVENT_METHOD_FAST)
+ {
+ ses->fast = true;
+ ses->func.wait = se_wait_fast;
+ }
+
+ /* Select needs to be passed this value + 1 */
+ ses->maxfd = -1;
+
+ /* Set our event capacity */
+ ASSERT (*maxevents > 0);
+ *maxevents = min_int (*maxevents, SELECT_MAX_FDS);
+ ses->capacity = SELECT_MAX_FDS;
+
+ /* Allocate space for event_set_return void * args */
+ ALLOC_ARRAY_CLEAR (ses->args, void *, ses->capacity);
+
+ return (struct event_set *) ses;
+}
+#endif /* SELECT */
+
+static struct event_set *
+event_set_init_simple (int *maxevents, unsigned int flags)
+{
+ struct event_set *ret = NULL;
+#ifdef WIN32
+ ret = we_init (maxevents, flags);
+#elif POLL && SELECT
+#if 0 /* Define to 1 if EVENT_METHOD_US_TIMEOUT should cause select to be favored over poll */
+ if (flags & EVENT_METHOD_US_TIMEOUT)
+ ret = se_init (maxevents, flags);
+#endif
+# ifdef SELECT_PREFERRED_OVER_POLL
+ if (!ret)
+ ret = se_init (maxevents, flags);
+ if (!ret)
+ ret = po_init (maxevents, flags);
+# else
+ if (!ret)
+ ret = po_init (maxevents, flags);
+ if (!ret)
+ ret = se_init (maxevents, flags);
+# endif
+#elif POLL
+ ret = po_init (maxevents, flags);
+#elif SELECT
+ ret = se_init (maxevents, flags);
+#else
+#error At least one of poll, select, or WSAWaitForMultipleEvents must be supported by the kernel
+#endif
+ ASSERT (ret);
+ return ret;
+}
+
+static struct event_set *
+event_set_init_scalable (int *maxevents, unsigned int flags)
+{
+ struct event_set *ret = NULL;
+#if EPOLL
+ ret = ep_init (maxevents, flags);
+ if (!ret)
+ {
+ msg (M_WARN, "Note: sys_epoll API is unavailable, falling back to poll/select API");
+ ret = event_set_init_simple (maxevents, flags);
+ }
+#else
+ ret = event_set_init_simple (maxevents, flags);
+#endif
+ ASSERT (ret);
+ return ret;
+}
+
+struct event_set *
+event_set_init (int *maxevents, unsigned int flags)
+{
+ if (flags & EVENT_METHOD_FAST)
+ return event_set_init_simple (maxevents, flags);
+ else
+ return event_set_init_scalable (maxevents, flags);
+}