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/*
This file is part of libmicrohttpd
Copyright (C) 2007-2018 Daniel Pittman and Christian Grothoff
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 Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file lib/daemon_get_fdset.c
* @brief function to get select() fdset of a daemon
* @author Christian Grothoff
*/
#include "internal.h"
/**
* We defined a macro with the same name as a function we
* are implementing here. Need to undef the macro to avoid
* causing a conflict.
*/
#undef MHD_daemon_get_fdset
/**
* Obtain the `select()` sets for this daemon. Daemon's FDs will be
* added to fd_sets. To get only daemon FDs in fd_sets, call FD_ZERO
* for each fd_set before calling this function. FD_SETSIZE is assumed
* to be platform's default.
*
* This function should only be called in when MHD is configured to
* use external select with 'select()' or with 'epoll'. In the latter
* case, it will only add the single 'epoll()' file descriptor used by
* MHD to the sets. It's necessary to use #MHD_get_timeout() in
* combination with this function.
*
* This function must be called only for daemon started without
* #MHD_USE_INTERNAL_POLLING_THREAD flag.
*
* @param daemon daemon to get sets from
* @param read_fd_set read set
* @param write_fd_set write set
* @param except_fd_set except set
* @param max_fd increased to largest FD added (if larger
* than existing value); can be NULL
* @return #MHD_SC_OK on success, otherwise error code
* @ingroup event
*/
enum MHD_StatusCode
MHD_daemon_get_fdset (struct MHD_Daemon *daemon,
fd_set *read_fd_set,
fd_set *write_fd_set,
fd_set *except_fd_set,
MHD_socket *max_fd)
{
return MHD_daemon_get_fdset2 (daemon,
read_fd_set,
write_fd_set,
except_fd_set,
max_fd,
_MHD_SYS_DEFAULT_FD_SETSIZE);
}
/**
* Internal version of #MHD_daemon_get_fdset2().
*
* @param daemon daemon to get sets from
* @param read_fd_set read set
* @param write_fd_set write set
* @param except_fd_set except set
* @param max_fd increased to largest FD added (if larger
* than existing value); can be NULL
* @param fd_setsize value of FD_SETSIZE
* @return #MHD_SC_OK on success
* @ingroup event
*/
static enum MHD_StatusCode
internal_get_fdset2 (struct MHD_Daemon *daemon,
fd_set *read_fd_set,
fd_set *write_fd_set,
fd_set *except_fd_set,
MHD_socket *max_fd,
unsigned int fd_setsize)
{
struct MHD_Connection *pos;
struct MHD_Connection *posn;
int result = MHD_YES;
MHD_socket ls;
if (daemon->shutdown)
return MHD_NO;
ls = daemon->listen_socket;
if ( (MHD_INVALID_SOCKET != ls) &&
(! daemon->was_quiesced) &&
(! MHD_add_to_fd_set_ (ls,
read_fd_set,
max_fd,
fd_setsize)) )
result = MHD_NO;
/* Add all sockets to 'except_fd_set' as well to watch for
* out-of-band data. However, ignore errors if INFO_READ
* or INFO_WRITE sockets will not fit 'except_fd_set'. */
/* Start from oldest connections. Make sense for W32 FDSETs. */
for (pos = daemon->connections_tail; NULL != pos; pos = posn)
{
posn = pos->prev;
switch (pos->request.event_loop_info)
{
case MHD_EVENT_LOOP_INFO_READ:
if (! MHD_add_to_fd_set_ (pos->socket_fd,
read_fd_set,
max_fd,
fd_setsize))
result = MHD_NO;
#ifdef MHD_POSIX_SOCKETS
MHD_add_to_fd_set_ (pos->socket_fd,
except_fd_set,
max_fd,
fd_setsize);
#endif /* MHD_POSIX_SOCKETS */
break;
case MHD_EVENT_LOOP_INFO_WRITE:
if (! MHD_add_to_fd_set_ (pos->socket_fd,
write_fd_set,
max_fd,
fd_setsize))
result = MHD_NO;
#ifdef MHD_POSIX_SOCKETS
MHD_add_to_fd_set_ (pos->socket_fd,
except_fd_set,
max_fd,
fd_setsize);
#endif /* MHD_POSIX_SOCKETS */
break;
case MHD_EVENT_LOOP_INFO_BLOCK:
if ( (NULL == except_fd_set) ||
! MHD_add_to_fd_set_ (pos->socket_fd,
except_fd_set,
max_fd,
fd_setsize))
result = MHD_NO;
break;
case MHD_EVENT_LOOP_INFO_CLEANUP:
/* this should never happen */
break;
}
}
#ifdef MHD_WINSOCK_SOCKETS
/* W32 use limited array for fd_set so add INFO_READ/INFO_WRITE sockets
* only after INFO_BLOCK sockets to ensure that INFO_BLOCK sockets will
* not be pushed out. */
for (pos = daemon->connections_tail; NULL != pos; pos = posn)
{
posn = pos->prev;
MHD_add_to_fd_set_ (pos->socket_fd,
except_fd_set,
max_fd,
fd_setsize);
}
#endif /* MHD_WINSOCK_SOCKETS */
#if defined(HTTPS_SUPPORT) && defined(UPGRADE_SUPPORT)
{
struct MHD_UpgradeResponseHandle *urh;
for (urh = daemon->urh_tail; NULL != urh; urh = urh->prev)
{
if (MHD_NO ==
urh_to_fdset (urh,
read_fd_set,
write_fd_set,
except_fd_set,
max_fd,
fd_setsize))
result = MHD_NO;
}
}
#endif
#if DEBUG_CONNECT
#ifdef HAVE_MESSAGES
if (NULL != max_fd)
MHD_DLOG (daemon,
_("Maximum socket in select set: %d\n"),
*max_fd);
#endif
#endif /* HTTPS_SUPPORT && UPGRADE_SUPPORT */
return result;
}
/**
* Obtain the `select()` sets for this daemon. Daemon's FDs will be
* added to fd_sets. To get only daemon FDs in fd_sets, call FD_ZERO
* for each fd_set before calling this function.
*
* Passing custom FD_SETSIZE as @a fd_setsize allow usage of
* larger/smaller than platform's default fd_sets.
*
* This function should only be called in when MHD is configured to
* use external select with 'select()' or with 'epoll'. In the latter
* case, it will only add the single 'epoll' file descriptor used by
* MHD to the sets. It's necessary to use #MHD_get_timeout() in
* combination with this function.
*
* This function must be called only for daemon started
* without #MHD_USE_INTERNAL_POLLING_THREAD flag.
*
* @param daemon daemon to get sets from
* @param read_fd_set read set
* @param write_fd_set write set
* @param except_fd_set except set
* @param max_fd increased to largest FD added (if larger
* than existing value); can be NULL
* @param fd_setsize value of FD_SETSIZE
* @return #MHD_SC_OK on success, otherwise error code
* @ingroup event
*/
enum MHD_StatusCode
MHD_daemon_get_fdset2 (struct MHD_Daemon *daemon,
fd_set *read_fd_set,
fd_set *write_fd_set,
fd_set *except_fd_set,
MHD_socket *max_fd,
unsigned int fd_setsize)
{
if ( (MHD_TM_EXTERNAL_EVENT_LOOP != daemon->threading_model) ||
(MHD_ELS_POLL == daemon->event_loop_syscall) )
return MHD_SC_CONFIGURATION_MISSMATCH_FOR_GET_FDSET;
#ifdef EPOLL_SUPPORT
if (MHD_ELS_EPOLL == daemon->event_loop_syscall)
{
if (daemon->shutdown)
return MHD_SC_DAEMON_ALREADY_SHUTDOWN;
/* we're in epoll mode, use the epoll FD as a stand-in for
the entire event set */
return MHD_add_to_fd_set_ (daemon->epoll_fd,
read_fd_set,
max_fd,
fd_setsize)
? MHD_SC_OK
: MHD_SC_SOCKET_OUTSIDE_OF_FDSET_RANGE;
}
#endif
return internal_get_fdset2 (daemon,
read_fd_set,
write_fd_set,
except_fd_set,
max_fd,
fd_setsize);
}
/* end of daemon_get_fdset.c */
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