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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_timeout.c
* @brief function to obtain timeout for event loop
* @author Christian Grothoff
*/
#include "internal.h"
/**
* Obtain timeout value for polling function for this daemon.
* This function set value to amount of milliseconds for which polling
* function (`select()` or `poll()`) should at most block, not the
* timeout value set for connections.
* It is important to always use this function, even if connection
* timeout is not set, as in some cases MHD may already have more
* data to process on next turn (data pending in TLS buffers,
* connections are already ready with epoll etc.) and returned timeout
* will be zero.
*
* @param daemon daemon to query for timeout
* @param timeout set to the timeout (in milliseconds)
* @return #MHD_SC_OK on success, #MHD_SC_NO_TIMEOUT if timeouts are
* not used (or no connections exist that would
* necessitate the use of a timeout right now), otherwise
* an error code
* @ingroup event
*/
enum MHD_StatusCode
MHD_daemon_get_timeout (struct MHD_Daemon *daemon,
MHD_UNSIGNED_LONG_LONG *timeout)
{
time_t earliest_deadline;
time_t now;
struct MHD_Connection *pos;
bool have_timeout;
if (MHD_TM_EXTERNAL_EVENT_LOOP != daemon->threading_mode)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
MHD_SC_CONFIGURATION_MISMATCH_FOR_GET_TIMEOUT,
_ ("Illegal call to MHD_get_timeout.\n"));
#endif
return MHD_SC_CONFIGURATION_MISMATCH_FOR_GET_TIMEOUT;
}
if (daemon->data_already_pending)
{
/* Some data already waiting to be processed. */
*timeout = 0;
return MHD_SC_OK;
}
#ifdef EPOLL_SUPPORT
if ( (MHD_ELS_EPOLL == daemon->event_loop_syscall) &&
((NULL != daemon->eready_head)
#if defined(UPGRADE_SUPPORT) && defined(HTTPS_SUPPORT)
|| (NULL != daemon->eready_urh_head)
#endif /* UPGRADE_SUPPORT && HTTPS_SUPPORT */
) )
{
/* Some connection(s) already have some data pending. */
*timeout = 0;
return MHD_SC_OK;
}
#endif /* EPOLL_SUPPORT */
have_timeout = false;
earliest_deadline = 0; /* avoid compiler warnings */
for (pos = daemon->manual_timeout_tail; NULL != pos; pos = pos->prevX)
{
if (0 != pos->connection_timeout)
{
if ( (! have_timeout) ||
(earliest_deadline - pos->last_activity > pos->connection_timeout) )
earliest_deadline = pos->last_activity + pos->connection_timeout;
have_timeout = true;
}
}
/* normal timeouts are sorted, so we only need to look at the 'tail' (oldest) */
pos = daemon->normal_timeout_tail;
if ( (NULL != pos) &&
(0 != pos->connection_timeout) )
{
if ( (! have_timeout) ||
(earliest_deadline - pos->connection_timeout > pos->last_activity) )
earliest_deadline = pos->last_activity + pos->connection_timeout;
have_timeout = true;
}
if (! have_timeout)
return MHD_SC_NO_TIMEOUT;
now = MHD_monotonic_sec_counter ();
if (earliest_deadline < now)
*timeout = 0;
else
{
const time_t second_left = earliest_deadline - now;
if (second_left > ULLONG_MAX / 1000) /* Ignore compiler warning: 'second_left' is always positive. */
*timeout = ULLONG_MAX;
else
*timeout = 1000LL * second_left;
}
return MHD_SC_OK;
}
/* end of daemon_get_timeout.c */
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