ilsimo
19 years ago
parent
20e26f1ccd
commit
fda836169e
@ -0,0 +1,200 @@
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/*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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||||
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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||||
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You should have received a copy of the GNU General Public License
|
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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xrdp: A Remote Desktop Protocol server.
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Copyright (C) Jay Sorg 2005-2006
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session manager
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linux only
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*/
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#include "sesman.h"
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#include <semaphore.h>
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#include <pthread.h>
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pthread_mutex_t lock_chain; /* session chain lock */
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pthread_mutexattr_t lock_chain_attr; /* mutex attributes */
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pthread_mutex_t lock_config; /* configuration access lock */
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pthread_mutexattr_t lock_config_attr; /* mutex attributes */
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pthread_mutex_t lock_fork; /* this lock protects the counters */
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pthread_mutexattr_t lock_fork_attr; /* mutex attributes */
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sem_t lock_fork_req; /* semaphore on which the process that are going to fork suspend on */
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sem_t lock_fork_wait; /* semaphore on which the suspended process wait on */
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int lock_fork_forkers_count; /* threads that want to fork */
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int lock_fork_blockers_count; /* threads thar are blocking fork */
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int lock_fork_waiting_count; /* threads suspended until the fork finishes */
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sem_t lock_socket;
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void DEFAULT_CC
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lock_init()
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{
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/* initializing socket lock */
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sem_init(&lock_socket, 0, 1);
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/* initializing chain lock */
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pthread_mutexattr_init(&lock_chain_attr);
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pthread_mutex_init(&lock_chain, &lock_chain_attr);
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/* initializing config lock */
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pthread_mutexattr_init(&lock_config_attr);
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pthread_mutex_init(&lock_config, &lock_config_attr);
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/* initializing fork lock */
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pthread_mutexattr_init(&lock_fork_attr);
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pthread_mutex_init(&lock_chain, &lock_fork_attr);
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sem_init(&lock_fork_req, 0, 0);
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sem_init(&lock_fork_wait, 0, 0);
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/* here we don't use locking because lock_init() should be called BEFORE */
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/* any thread is created */
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lock_fork_blockers_count=0;
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lock_fork_waiting_count=0;
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lock_fork_forkers_count=0;
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}
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/******************************************************************************/
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void DEFAULT_CC
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lock_chain_acquire()
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{
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/*lock the chain*/
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LOG_DBG("lock_chain_acquire()",0);
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pthread_mutex_lock(&lock_chain);
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}
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/******************************************************************************/
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void DEFAULT_CC
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lock_chain_release()
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{
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/*unlock the chain*/
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LOG_DBG("lock_chain_release()",0);
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pthread_mutex_unlock(&lock_chain);
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}
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/******************************************************************************/
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void DEFAULT_CC
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lock_socket_acquire()
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{
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/* lock socket variable */
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LOG_DBG("lock_socket_acquire()",0);
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sem_wait(&lock_socket);
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}
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/******************************************************************************/
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void DEFAULT_CC
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lock_socket_release()
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{
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/* unlock socket variable */
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LOG_DBG("lock_socket_release()",0);
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sem_post(&lock_socket);
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}
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/******************************************************************************/
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void DEFAULT_CC
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lock_fork_request()
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{
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/* lock mutex */
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pthread_mutex_lock(&lock_fork);
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if (lock_fork_blockers_count == 0)
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{
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/* if noone is blocking fork(), then we're allowed to fork */
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sem_post(&lock_fork_req);
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}
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lock_fork_forkers_count++;
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pthread_mutex_unlock(&lock_fork);
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/* we wait to be allowed to fork() */
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sem_wait(&lock_fork_req);
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}
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/******************************************************************************/
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void DEFAULT_CC
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lock_fork_release()
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{
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pthread_mutex_lock(&lock_fork);
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lock_fork_forkers_count--;
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/* if there's someone else that want to fork, we let him fork() */
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if (lock_fork_forkers_count > 0)
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{
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sem_post(&lock_fork_req);
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}
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for (;lock_fork_waiting_count > 0; lock_fork_waiting_count--)
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{
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/* waking up the other processes */
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sem_post(&lock_fork_wait);
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}
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pthread_mutex_unlock(&lock_fork);
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}
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/******************************************************************************/
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void DEFAULT_CC
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lock_fork_critical_section_end(int blocking)
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{
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LOG_DBG("lock_fork_critical_secection_end()",0);
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/* lock mutex */
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pthread_mutex_lock(&lock_fork);
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if (blocking == SESMAN_LOCK_FORK_BLOCKER)
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{
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lock_fork_blockers_count--;
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}
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/* if there's someone who wants to fork and we're the last blocking */
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/* then we let him go */
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if ((lock_fork_blockers_count == 0) && (lock_fork_forkers_count>0))
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{
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sem_post(&lock_fork_req);
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}
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pthread_mutex_unlock(&lock_fork);
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}
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/******************************************************************************/
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int DEFAULT_CC
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lock_fork_critical_section_start()
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{
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LOG_DBG("lock_fork_critical_secection_start()",0);
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do
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{
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pthread_mutex_lock(&lock_fork);
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/* someone requested to fork */
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if (lock_fork_forkers_count > 0)
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{
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lock_fork_waiting_count++;
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pthread_mutex_unlock(&lock_fork);
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/* we wait until the fork finishes */
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sem_wait(&lock_fork_wait);
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}
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else
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{
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/* no fork, so we can go on... */
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lock_fork_blockers_count++;
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pthread_mutex_unlock(&lock_fork);
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return SESMAN_LOCK_FORK_BLOCKER;
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}
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} while (1);
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/* we'll never get here */
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return SESMAN_LOCK_FORK_WAITING;
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}
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@ -0,0 +1,122 @@
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/*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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|
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
|
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|
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You should have received a copy of the GNU General Public License
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||||
along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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xrdp: A Remote Desktop Protocol server.
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Copyright (C) Jay Sorg 2005-2006
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*/
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#ifndef LOCK_H
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#define LOCK_H
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#include "sesman.h"
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#define SESMAN_LOCK_FORK_BLOCKER 1
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#define SESMAN_LOCK_FORK_WAITING 0
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/**
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*
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* @brief initializes all the locks
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*
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*/
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void DEFAULT_CC
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lock_init();
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/**
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*
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* @brief acquires the lock for the session chain
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*
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*/
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void DEFAULT_CC
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lock_chain_acquire();
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/**
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*
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* @brief releases the sessiona chain lock
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*
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*/
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void DEFAULT_CC
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lock_chain_release();
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/**
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*
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* @brief acquires config lock
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*
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*/
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void DEFAULT_CC
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lock_cfg_acquire();
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/**
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*
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* @brief releases config lock
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*
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*/
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void DEFAULT_CC
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lock_cfg_release();
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/**
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*
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* @brief request the socket lock
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*
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*/
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void DEFAULT_CC
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lock_socket_acquire();
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/**
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*
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* @brief releases the socket lock
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*
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*/
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void DEFAULT_CC
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lock_socket_release();
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/**
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*
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* @brief requires to fork a new child process
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*
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*/
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void DEFAULT_CC
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lock_fork_request();
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/**
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*
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* @brief releases a fork() request
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*
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*/
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void DEFAULT_CC
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lock_fork_release();
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/**
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*
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* @brief starts a section that is critical for forking
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*
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* starts a section that is critical for forking, that is noone can fork()
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* while i'm in a critical section. But if someone wanted to fork we have
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* to wait until he finishes with lock_fork_release()
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*
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* @return
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*
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*/
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int DEFAULT_CC
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lock_fork_critical_section_start();
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/**
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*
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* @brief closes the critical section
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*
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*/
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void DEFAULT_CC
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lock_fork_critical_section_end(int blocking);
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#endif
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@ -0,0 +1,173 @@
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/*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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GNU General Public License for more details.
|
||||
|
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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.
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xrdp: A Remote Desktop Protocol server.
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Copyright (C) Jay Sorg 2005-2006
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*/
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/**
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*
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* @file thread.c
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* @brief thread stuff...
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* @author Simone Fedele
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*
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*/
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#include "sesman.h"
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#include <errno.h>
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#include <signal.h>
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#include <pthread.h>
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static pthread_t thread_sighandler;
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//static pthread_t thread_updater;
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/* a variable to pass the socket of s connection to a thread */
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int thread_sck;
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/******************************************************************************/
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int DEFAULT_CC
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thread_sighandler_start()
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{
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int ret;
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sigset_t sigmask;
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sigset_t oldmask;
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sigset_t waitmask;
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/* mask signals to be able to wait for them... */
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sigfillset(&sigmask);
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pthread_sigmask(SIG_BLOCK, &sigmask, &oldmask);
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/* unblock some signals... */
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sigemptyset(&waitmask);
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/* it is a good idea not to block SIGILL SIGSEGV */
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/* SIGFPE -- see sigaction(2) NOTES */
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sigaddset(&waitmask, SIGILL);
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sigaddset(&waitmask, SIGSEGV);
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sigaddset(&waitmask, SIGFPE);
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pthread_sigmask(SIG_UNBLOCK, &waitmask, NULL);
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log_message(LOG_LEVEL_INFO,"starting signal handling thread...");
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ret = pthread_create(&thread_sighandler, NULL, sig_handler_thread, "");
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pthread_detach(thread_sighandler);
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if (ret==0)
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{
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log_message(LOG_LEVEL_INFO, "signal handler thread started successfully");
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return 0;
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}
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/* if something happened while starting a new thread... */
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switch (ret)
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{
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case EINVAL:
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log_message(LOG_LEVEL_ERROR, "invalid attributes for signal handling thread (creation returned EINVAL)");
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break;
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case EAGAIN:
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log_message(LOG_LEVEL_ERROR, "not enough resources to start signal handling thread (creation returned EAGAIN)");
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break;
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case EPERM:
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log_message(LOG_LEVEL_ERROR, "invalid permissions for signal handling thread (creation returned EPERM)");
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break;
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default:
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log_message(LOG_LEVEL_ERROR, "unknown error starting signal handling thread");
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}
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return 1;
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}
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#ifdef JUST_TO_AVOID_COMPILER_ERRORS
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/******************************************************************************/
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int DEFAULT_CC
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thread_session_update_start()
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{
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int ret;
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//starts the session update thread
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//that checks for idle time, destroys sessions, ecc...
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#warning this thread should always request lock_fork before read or write
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#warning (so we can Fork() In Peace)
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ret = pthread_create(&thread_updater, NULL, , "");
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pthread_detach(thread_updater);
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if (ret==0)
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{
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log_message(LOG_LEVEL_INFO, "session update thread started successfully");
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return 0;
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}
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/* if something happened while starting a new thread... */
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switch (ret)
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{
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case EINVAL:
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log_message(LOG_LEVEL_ERROR, "invalid attributes for session update thread (creation returned EINVAL)");
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break;
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case EAGAIN:
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log_message(LOG_LEVEL_ERROR, "not enough resources to start session update thread (creation returned EAGAIN)");
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break;
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case EPERM:
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log_message(LOG_LEVEL_ERROR, "invalid permissions for session update thread (creation returned EPERM)");
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break;
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default:
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log_message(LOG_LEVEL_ERROR, "unknown error starting session update thread");
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}
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return 1;
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}
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#endif
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||||
/******************************************************************************/
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||||
int DEFAULT_CC
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thread_scp_start(int skt)
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{
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int ret;
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pthread_t th;
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/* blocking the use of thread_skt */
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lock_socket_acquire();
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thread_sck=skt;
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/* start a thread that processes a connection */
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ret = pthread_create(&th, NULL, scp_process_start, "");
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//ret = pthread_create(&th, NULL, scp_process_start, (void*) (&thread_sck));
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pthread_detach(th);
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if (ret==0)
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{
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log_message(LOG_LEVEL_INFO, "scp thread on sck %d started successfully", skt);
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return 0;
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}
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||||
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||||
/* if something happened while starting a new thread... */
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||||
switch (ret)
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||||
{
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||||
case EINVAL:
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||||
log_message(LOG_LEVEL_ERROR, "invalid attributes for scp thread on sck %d (creation returned EINVAL)", skt);
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||||
break;
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||||
case EAGAIN:
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||||
log_message(LOG_LEVEL_ERROR, "not enough resources to start scp thread on sck %d (creation returned EAGAIN)", skt);
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break;
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||||
case EPERM:
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log_message(LOG_LEVEL_ERROR, "invalid permissions for scp thread on sck %d (creation returned EPERM)", skt);
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||||
break;
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||||
default:
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log_message(LOG_LEVEL_ERROR, "unknown error starting scp thread on sck %d");
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}
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||||
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||||
return 1;
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||||
}
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||||
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||||
@ -0,0 +1,57 @@
|
||||
/*
|
||||
This program is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 2 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
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; if not, write to the Free Software
|
||||
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
|
||||
xrdp: A Remote Desktop Protocol server.
|
||||
Copyright (C) Jay Sorg 2005-2006
|
||||
*/
|
||||
|
||||
/**
|
||||
*
|
||||
* @file thread.h
|
||||
* @brief thread stuff...
|
||||
* @author Simone Fedele
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef THREAD_H
|
||||
#define THREAD_H
|
||||
|
||||
/**
|
||||
*
|
||||
* @brief Starts the signal handling thread
|
||||
* @retval 0 on success
|
||||
* @retval 1 on error
|
||||
*
|
||||
*/
|
||||
int DEFAULT_CC
|
||||
thread_sighandler_start();
|
||||
|
||||
/**
|
||||
*
|
||||
* @brief Starts the session update thread
|
||||
*
|
||||
*/
|
||||
int DEFAULT_CC
|
||||
thread_session_update_start();
|
||||
|
||||
/**
|
||||
*
|
||||
* @brief Starts a thread to handle an incoming connection
|
||||
*
|
||||
*/
|
||||
int DEFAULT_CC
|
||||
thread_scp_start();
|
||||
|
||||
#endif
|
||||
Loading…
Reference in new issue