xrdp/sesman/thread.c

/**
 * xrdp: A Remote Desktop Protocol server.
 *
 * Copyright (C) Jay Sorg 2004-2013
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 *
 * @file thread.c
 * @brief thread stuff...
 * @author Simone Fedele
 *
 */

#include "sesman.h"

#include <errno.h>
#include <signal.h>
#include <pthread.h>

extern struct config_sesman *g_cfg; /* in sesman.c */

static pthread_t g_thread_sighandler;
//static pthread_t g_thread_updater;

/* a variable to pass the socket of s connection to a thread */
int g_thread_sck;

/******************************************************************************/
int DEFAULT_CC
thread_sighandler_start(void)
{
    int ret;
    sigset_t sigmask;
    sigset_t oldmask;
    sigset_t waitmask;

    /* mask signals to be able to wait for them... */
    sigfillset(&sigmask);
    pthread_sigmask(SIG_BLOCK, &sigmask, &oldmask);

    /* unblock some signals... */
    sigemptyset(&waitmask);

    /* it is a good idea not to block SIGILL SIGSEGV */
    /* SIGFPE -- see sigaction(2) NOTES              */
    sigaddset(&waitmask, SIGILL);
    sigaddset(&waitmask, SIGSEGV);
    sigaddset(&waitmask, SIGFPE);
    pthread_sigmask(SIG_UNBLOCK, &waitmask, NULL);

    log_message(LOG_LEVEL_INFO, "starting signal handling thread...");

    ret = pthread_create(&g_thread_sighandler, NULL, sig_handler_thread, "");
    pthread_detach(g_thread_sighandler);

    if (ret == 0)
    {
        log_message(LOG_LEVEL_INFO, "signal handler thread started successfully");
        return 0;
    }

    /* if something happened while starting a new thread... */
    switch (ret)
    {
        case EINVAL:
            log_message(LOG_LEVEL_ERROR, "invalid attributes for signal handling thread (creation returned  EINVAL)");
            break;
        case EAGAIN:
            log_message(LOG_LEVEL_ERROR, "not enough resources to start signal handling thread (creation returned EAGAIN)");
            break;
        case EPERM:
            log_message(LOG_LEVEL_ERROR, "invalid permissions for signal handling thread (creation returned EPERM)");
            break;
        default:
            log_message(LOG_LEVEL_ERROR, "unknown error starting signal handling thread");
    }

    return 1;
}

#ifdef JUST_TO_AVOID_COMPILER_ERRORS
/******************************************************************************/
int DEFAULT_CC
thread_session_update_start(void)
{
    int ret;
    //starts the session update thread
    //that checks for idle time, destroys sessions, ecc...

#warning this thread should always request lock_fork before read or write
#warning (so we can Fork() In Peace)
    ret = pthread_create(&g_thread_updater, NULL, , "");
    pthread_detach(g_thread_updater);

    if (ret == 0)
    {
        log_message(&(g_cfg->log), LOG_LEVEL_INFO, "session update thread started successfully");
        return 0;
    }

    /* if something happened while starting a new thread... */
    switch (ret)
    {
        case EINVAL:
            log_message(LOG_LEVEL_ERROR, "invalid attributes for session update thread (creation returned  EINVAL)");
            break;
        case EAGAIN:
            log_message(LOG_LEVEL_ERROR, "not enough resources to start session update thread (creation returned EAGAIN)");
            break;
        case EPERM:
            log_message(LOG_LEVEL_ERROR, "invalid permissions for session update thread (creation returned EPERM)");
            break;
        default:
            log_message(LOG_LEVEL_ERROR, "unknown error starting session update thread");
    }

    return 1;
}
#endif

/******************************************************************************/
int DEFAULT_CC
thread_scp_start(int skt)
{
    int ret;
    pthread_t th;

    /* blocking the use of thread_skt */
    lock_socket_acquire();
    g_thread_sck = skt;

    /* start a thread that processes a connection */
    ret = pthread_create(&th, NULL, scp_process_start, "");
    //ret = pthread_create(&th, NULL, scp_process_start, (void*) (&g_thread_sck));
    pthread_detach(th);

    if (ret == 0)
    {
        log_message(LOG_LEVEL_INFO, "scp thread on sck %d started successfully", skt);
        return 0;
    }

    /* if something happened while starting a new thread... */
    switch (ret)
    {
        case EINVAL:
            log_message(LOG_LEVEL_ERROR, "invalid attributes for scp thread on sck %d (creation returned  EINVAL)", skt);
            break;
        case EAGAIN:
            log_message(LOG_LEVEL_ERROR, "not enough resources to start scp thread on sck %d (creation returned EAGAIN)", skt);
            break;
        case EPERM:
            log_message(LOG_LEVEL_ERROR, "invalid permissions for scp thread on sck %d (creation returned EPERM)", skt);
            break;
        default:
            log_message(LOG_LEVEL_ERROR, "unknown error starting scp thread on sck %d");
    }

    return 1;
}