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freeswitch/libs/sofia-sip/libsofia-sip-ua/su/su_select_port.c

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/*
* This file is part of the Sofia-SIP package
*
* Copyright (C) 2005 Nokia Corporation.
*
* Contact: Pekka Pessi <pekka.pessi@nokia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
/**@ingroup su_wait
* @CFILE su_select_port.c
*
* Port implementation using select().
*
* @author Pekka Pessi <Pekka.Pessi@nokia.com>
* @author Kai Vehmanen <kai.vehmanen@nokia.com>
*
* @date Created: Fri Jan 26 17:56:34 2007 ppessi
*/
#include "config.h"
#if HAVE_SELECT
#define su_port_s su_select_port_s
#include "sofia-sip/su.h"
#include "su_port.h"
#include "sofia-sip/su_alloc.h"
#include <stdlib.h>
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
#if HAVE_WIN32
#error winsock select() not supported yet
#else
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#elif HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <sys/types.h>
#include <unistd.h>
#ifndef __NFDBITS
#define __NFDBITS (8 * sizeof (long int))
#endif
#undef FDSETSIZE
/* Size of fd set in bytes */
#define FDSETSIZE(n) (((n) + __NFDBITS - 1) / __NFDBITS * (__NFDBITS / 8))
#endif
/** Port based on select(). */
struct su_select_port_s {
su_socket_port_t sup_base[1];
#define sup_home sup_base->sup_base->sup_base->sup_home
/** epoll fd */
int sup_epoll;
unsigned sup_multishot; /**< Multishot operation? */
unsigned sup_registers; /** Counter incremented by
su_port_register() or
su_port_unregister()
*/
int sup_n_registrations;
int sup_max_index; /**< Indexes are equal or smaller than this */
int sup_size_indices; /**< Size of allocated index table */
/** Structure containing registration data */
struct su_select_register {
struct su_select_register *ser_next; /* Next in free list */
su_wakeup_f ser_cb;
su_wakeup_arg_t*ser_arg;
su_root_t *ser_root;
int ser_id; /** registration identifier */
su_wait_t ser_wait[1];
} **sup_indices;
int sup_maxfd, sup_allocfd;
fd_set *sup_readfds, *sup_readfds2;
fd_set *sup_writefds, *sup_writefds2;
};
static void su_select_port_decref(su_port_t *self,
int blocking,
char const *who);
static int su_select_port_register(su_port_t *self,
su_root_t *root,
su_wait_t *wait,
su_wakeup_f callback,
su_wakeup_arg_t *arg,
int priority);
static int su_select_port_unregister(su_port_t *port,
su_root_t *root,
su_wait_t *wait,
su_wakeup_f callback,
su_wakeup_arg_t *arg);
static int su_select_port_deregister(su_port_t *self, int i);
static int su_select_port_unregister_all(su_port_t *self, su_root_t *root);
static int su_select_port_eventmask(su_port_t *self,
int index,
int socket,
int events);
static int su_select_port_multishot(su_port_t *self, int multishot);
static int su_select_port_wait_events(su_port_t *self, su_duration_t tout);
static char const *su_select_port_name(su_port_t const *self);
su_port_vtable_t const su_select_port_vtable[1] =
{{
/* su_vtable_size: */ sizeof su_select_port_vtable,
su_pthread_port_lock,
su_pthread_port_unlock,
su_base_port_incref,
su_select_port_decref,
su_base_port_gsource,
su_base_port_send,
su_select_port_register,
su_select_port_unregister,
su_select_port_deregister,
su_select_port_unregister_all,
su_select_port_eventmask,
su_base_port_run,
su_base_port_break,
su_base_port_step,
su_pthread_port_thread,
su_base_port_add_prepoll,
su_base_port_remove_prepoll,
su_base_port_timers,
su_select_port_multishot,
su_select_port_wait_events,
su_base_port_getmsgs,
su_base_port_getmsgs_from,
su_select_port_name,
su_base_port_start_shared,
su_pthread_port_wait,
su_pthread_port_execute,
su_base_port_deferrable,
su_base_port_max_defer,
su_socket_port_wakeup,
su_base_port_is_running,
}};
static char const *su_select_port_name(su_port_t const *self)
{
return "select";
}
static void su_select_port_decref(su_port_t *self, int blocking, char const *who)
{
(void)su_base_port_decref(self, blocking, who);
}
static void su_select_port_deinit(void *arg)
{
su_port_t *self = arg;
SU_DEBUG_9(("%s(%p) called\n", "su_select_port_deinit", (void *)self));
su_socket_port_deinit(self->sup_base);
}
/** @internal
*
* Register a #su_wait_t object. The wait object, a callback function and
* an argument pointer is stored in the port object. The callback function
* will be called when the wait object is signaled.
*
* Please note if identical wait objects are inserted, only first one is
* ever signalled.
*
* @param self pointer to port
* @param root pointer to root object
* @param waits pointer to wait object
* @param callback callback function pointer
* @param arg argument given to callback function when it is invoked
* @param priority relative priority of the wait object
* (0 is normal, 1 important, 2 realtime)
*
* @return
* Positive index of the wait object,
* or -1 upon an error.
*/
int su_select_port_register(su_port_t *self,
su_root_t *root,
su_wait_t *wait,
su_wakeup_f callback,
su_wakeup_arg_t *arg,
int priority)
{
int i, j, n;
struct su_select_register *ser;
struct su_select_register **indices = self->sup_indices;
int allocfd = self->sup_allocfd;
fd_set *readfds = self->sup_readfds, *readfds2 = self->sup_readfds2;
fd_set *writefds = self->sup_writefds, *writefds2 = self->sup_writefds2;
assert(su_port_own_thread(self));
n = self->sup_size_indices;
if (n >= SU_WAIT_MAX)
return su_seterrno(ENOMEM);
self->sup_registers++;
if (wait->fd >= allocfd)
allocfd += __NFDBITS; /* long at a time */
if (allocfd >= self->sup_allocfd) {
size_t bytes = FDSETSIZE(allocfd);
size_t bytes0 = FDSETSIZE(self->sup_allocfd);
/* (Re)allocate fd_sets */
readfds = su_realloc(self->sup_home, readfds, bytes);
if (readfds) self->sup_readfds = readfds;
readfds2 = su_realloc(self->sup_home, readfds2, bytes);
if (readfds2) self->sup_readfds2 = readfds2;
if (!readfds || !readfds2)
return -1;
writefds = su_realloc(self->sup_home, writefds, bytes);
if (writefds) self->sup_writefds = writefds;
writefds2 = su_realloc(self->sup_home, writefds2, bytes);
if (writefds2) self->sup_writefds2 = writefds2;
if (!writefds || !writefds2)
return -1;
memset((char *)readfds + bytes0, 0, bytes - bytes0);
memset((char *)writefds + bytes0, 0, bytes - bytes0);
self->sup_allocfd = allocfd;
}
ser = indices[0];
if (!ser) {
su_home_t *h = su_port_home(self);
i = self->sup_max_index, j = i == 0 ? 15 : i + 16;
if (j >= self->sup_size_indices) {
/* Reallocate index table */
n = n < 1024 ? 2 * n : n + 1024;
indices = su_realloc(h, indices, n * sizeof(indices[0]));
if (!indices)
return -1;
self->sup_indices = indices;
self->sup_size_indices = n;
}
/* Allocate registrations */
ser = su_zalloc(h, (j - i) * (sizeof *ser));
if (!ser)
return -1;
indices[0] = ser;
for (i++; i <= j; i++) {
ser->ser_id = i;
ser->ser_next = i < j ? ser + 1 : NULL;
indices[i] = ser++;
}
self->sup_max_index = j;
ser = indices[0];
}
i = ser->ser_id;
indices[0] = ser->ser_next;
ser->ser_next = NULL;
*ser->ser_wait = *wait;
ser->ser_cb = callback;
ser->ser_arg = arg;
ser->ser_root = root;
if (wait->events & SU_WAIT_IN)
FD_SET(wait->fd, readfds);
if (wait->events & SU_WAIT_OUT)
FD_SET(wait->fd, writefds);
if (wait->fd >= self->sup_maxfd)
self->sup_maxfd = wait->fd + 1;
self->sup_n_registrations++;
return i; /* return index */
}
static void su_select_port_update_maxfd(su_port_t *self)
{
int i;
su_socket_t maxfd = 0;
for (i = 1; i <= self->sup_max_index; i++) {
if (!self->sup_indices[i]->ser_cb)
continue;
if (maxfd <= self->sup_indices[i]->ser_wait->fd)
maxfd = self->sup_indices[i]->ser_wait->fd + 1;
}
self->sup_maxfd = maxfd;
}
/** Deregister a su_wait_t object. */
static int su_select_port_deregister0(su_port_t *self, int i, int destroy_wait)
{
struct su_select_register **indices = self->sup_indices;
struct su_select_register *ser;
ser = self->sup_indices[i];
if (ser == NULL || ser->ser_cb == NULL) {
su_seterrno(ENOENT);
return -1;
}
assert(ser->ser_id == i);
FD_CLR(ser->ser_wait->fd, self->sup_readfds);
FD_CLR(ser->ser_wait->fd, self->sup_writefds);
if (ser->ser_wait->fd + 1 >= self->sup_maxfd)
self->sup_maxfd = 0;
memset(ser, 0, sizeof *ser);
ser->ser_id = i;
ser->ser_next = indices[0], indices[0] = ser;
self->sup_n_registrations--;
self->sup_registers++;
return i;
}
/** Unregister a su_wait_t object.
*
* The function su_select_port_unregister() unregisters a su_wait_t object.
* The registration defined by the wait object, the callback function and
* the argument pointer are removed from the port object.
*
* @param self - pointer to port object
* @param root - pointer to root object
* @param wait - pointer to wait object
* @param callback - callback function pointer (may be NULL)
* @param arg - argument given to callback function when it is invoked
* (may be NULL)
*
* @deprecated Use su_select_port_deregister() instead.
*
* @return Nonzero index of the wait object, or -1 upon an error.
*/
int su_select_port_unregister(su_port_t *self,
su_root_t *root,
su_wait_t *wait,
su_wakeup_f callback, /* XXX - ignored */
su_wakeup_arg_t *arg)
{
int i, I;
struct su_select_register *ser;
assert(self);
assert(su_port_own_thread(self));
I = self->sup_max_index;
for (i = 1; i <= I; i++) {
ser = self->sup_indices[i];
if (ser->ser_cb &&
arg == ser->ser_arg &&
SU_WAIT_CMP(wait[0], ser->ser_wait[0]) == 0)
return su_select_port_deregister0(self, ser->ser_id, 0);
}
su_seterrno(ENOENT);
return -1;
}
/** Deregister a su_wait_t object.
*
* Deregisters a registration by index. The wait object, a callback
* function and a argument are removed from the port object. The wait
* object is destroyed.
*
* @param self - pointer to port object
* @param i - registration index
*
* @return Index of the wait object, or -1 upon an error.
*/
int su_select_port_deregister(su_port_t *self, int i)
{
struct su_select_register *ser;
if (i <= 0 || i > self->sup_max_index)
return su_seterrno(EBADF);
ser = self->sup_indices[i];
if (!ser->ser_cb)
return su_seterrno(EBADF);
return su_select_port_deregister0(self, i, 1);
}
/** @internal
* Unregister all su_wait_t objects of given su_root_t instance.
*
* The function su_select_port_unregister_all() unregisters all su_wait_t
* objects associated with given root object.
*
* @param self - pointer to port object
* @param root - pointer to root object
*
* @return Number of wait objects removed.
*/
int su_select_port_unregister_all(su_port_t *self, su_root_t *root)
{
int i, I, n;
struct su_select_register *ser;
assert(self); assert(root);
assert(su_port_own_thread(self));
I = self->sup_max_index;
for (i = 1, n = 0; i <= I; i++) {
ser = self->sup_indices[i];
if (ser->ser_root != root)
continue;
su_select_port_deregister0(self, ser->ser_id, 0);
n++;
}
return n;
}
/**Set mask for a registered event. @internal
*
* The function su_select_port_eventmask() sets the mask describing events
* that can signal the registered callback.
*
* @param port pointer to port object
* @param index registration index
* @param socket socket
* @param events new event mask
*
* @retval 0 when successful,
* @retval -1 upon an error.
*/
int su_select_port_eventmask(su_port_t *self,
int index,
int socket, int events)
{
struct su_select_register *ser;
if (index <= 0 || index > self->sup_max_index)
return su_seterrno(EBADF);
ser = self->sup_indices[index];
if (!ser->ser_cb)
return su_seterrno(EBADF);
if (self->sup_maxfd == 0)
su_select_port_update_maxfd(self);
if (socket >= self->sup_maxfd)
return su_seterrno(EBADF);
if (su_wait_mask(ser->ser_wait, socket, events) < 0)
return -1;
assert(socket < self->sup_maxfd);
if (events & SU_WAIT_IN)
FD_SET(socket, self->sup_readfds);
else
FD_CLR(socket, self->sup_readfds);
if (events & SU_WAIT_OUT)
FD_SET(socket, self->sup_writefds);
else
FD_CLR(socket, self->sup_writefds);
return 0;
}
/** @internal Enable multishot mode.
*
* Enables, disables or queries the multishot mode for the port. The
* multishot mode determines how the events are scheduled by port. If
* multishot mode is enabled, port serves all the sockets that have received
* network events. If it is disabled, only first socket event is served.
*
* @param self pointer to port object
* @param multishot multishot mode (0 => disables, 1 => enables, -1 => query)
*
* @retval 0 multishot mode is disabled
* @retval 1 multishot mode is enabled
* @retval -1 an error occurred
*/
static
int su_select_port_multishot(su_port_t *self, int multishot)
{
if (multishot < 0)
return self->sup_multishot;
else if (multishot == 0 || multishot == 1)
return self->sup_multishot = multishot;
else
return (errno = EINVAL), -1;
}
/** @internal
* Wait (poll()) for wait objects in port.
*
* @param self pointer to port
* @param tout timeout in milliseconds
*
* @return number of events handled
*/
static
int su_select_port_wait_events(su_port_t *self, su_duration_t tout)
{
int j, n, events = 0;
unsigned version = self->sup_registers;
size_t bytes;
struct timeval tv;
fd_set *rset = NULL, *wset = NULL;
if (self->sup_maxfd == 0)
su_select_port_update_maxfd(self);
bytes = FDSETSIZE(self->sup_maxfd);
if (bytes) {
rset = memcpy(self->sup_readfds2, self->sup_readfds, bytes);
wset = memcpy(self->sup_writefds2, self->sup_writefds, bytes);
}
tv.tv_sec = tout / 1000;
tv.tv_usec = (tout % 1000) * 1000;
n = select(self->sup_maxfd, rset, wset, NULL, &tv);
if (n < 0) {
SU_DEBUG_0(("su_select_port_wait_events(%p): %s (%d)\n",
(void *)self, su_strerror(su_errno()), su_errno()));
return 0;
}
else if (n == 0)
return 0;
for (j = 1; j <= self->sup_max_index; j++) {
struct su_select_register *ser;
su_root_magic_t *magic;
int fd;
ser = self->sup_indices[j];
if (!ser->ser_cb)
continue;
fd = ser->ser_wait->fd;
ser->ser_wait->revents = 0;
if (ser->ser_wait->events & SU_WAIT_IN)
if (FD_ISSET(fd, rset)) ser->ser_wait->revents |= SU_WAIT_IN, n--;
if (ser->ser_wait->events & SU_WAIT_OUT)
if (FD_ISSET(fd, wset)) ser->ser_wait->revents |= SU_WAIT_OUT, n--;
if (ser->ser_wait->revents) {
magic = ser->ser_root ? su_root_magic(ser->ser_root) : NULL;
ser->ser_cb(magic, ser->ser_wait, ser->ser_arg);
events++;
if (version != self->sup_registers)
/* Callback function used su_register()/su_deregister() */
return events;
if (!self->sup_multishot)
/* Callback function used su_register()/su_deregister() */
return events;
}
if (n == 0)
break;
}
assert(n == 0);
return events;
}
/** Create a port using epoll() or poll().
*/
su_port_t *su_select_port_create(void)
{
su_port_t *self;
self = su_home_new(sizeof *self);
if (!self)
return NULL;
if (su_home_destructor(su_port_home(self), su_select_port_deinit) < 0 ||
!(self->sup_indices =
su_zalloc(su_port_home(self),
(sizeof self->sup_indices[0]) *
(self->sup_size_indices = __NFDBITS)))) {
su_home_unref(su_port_home(self));
return NULL;
}
self->sup_multishot = SU_ENABLE_MULTISHOT_POLL;
if (su_socket_port_init(self->sup_base, su_select_port_vtable) < 0)
return su_home_unref(su_port_home(self)), NULL;
return self;
}
int su_select_clone_start(su_root_t *parent,
su_clone_r return_clone,
su_root_magic_t *magic,
su_root_init_f init,
su_root_deinit_f deinit)
{
return su_pthreaded_port_start(su_select_port_create,
parent, return_clone, magic, init, deinit);
}
#endif
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