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/**
* 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 sig.c
* @brief signal handling functions
* @author Jay Sorg, Simone Fedele
*
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include <signal.h>
#include "sesman.h"
extern int g_pid;
extern struct config_sesman *g_cfg; /* in sesman.c */
extern tbus g_term_event;
/******************************************************************************/
void
sig_sesman_shutdown(int sig)
{
char pid_file[256];
LOG(LOG_LEVEL_INFO, "shutting down sesman %d", 1);
if (g_getpid() != g_pid)
{
LOG_DEVEL(LOG_LEVEL_DEBUG, "g_getpid() [%d] differs from g_pid [%d]", (g_getpid()), g_pid);
return;
}
LOG_DEVEL(LOG_LEVEL_DEBUG, " - getting signal %d pid %d", sig, g_getpid());
g_set_wait_obj(g_term_event);
session_sigkill_all();
g_snprintf(pid_file, 255, "%s/xrdp-sesman.pid", XRDP_PID_PATH);
g_file_delete(pid_file);
}
/******************************************************************************/
void
sig_sesman_reload_cfg(int sig)
{
int error;
struct config_sesman *cfg;
LOG(LOG_LEVEL_WARNING, "receiving SIGHUP %d", 1);
if (g_getpid() != g_pid)
{
LOG_DEVEL(LOG_LEVEL_DEBUG, "g_getpid() [%d] differs from g_pid [%d]", g_getpid(), g_pid);
return;
}
if ((cfg = config_read(g_cfg->sesman_ini)) == NULL)
{
LOG(LOG_LEVEL_ERROR, "error reading config - keeping old cfg");
return;
}
/* stop logging subsystem */
log_end();
/* free old config data */
config_free(g_cfg);
/* replace old config with newly read one */
g_cfg = cfg;
/* start again logging subsystem */
error = log_start(g_cfg->sesman_ini, "xrdp-sesman", 0);
if (error != LOG_STARTUP_OK)
{
char buf[256];
switch (error)
{
case LOG_ERROR_MALLOC:
g_printf("error on malloc. cannot restart logging. log stops here, sorry.\n");
break;
case LOG_ERROR_FILE_OPEN:
g_printf("error reopening log file [%s]. log stops here, sorry.\n", getLogFile(buf, 255));
break;
}
}
LOG(LOG_LEVEL_INFO, "configuration reloaded, log subsystem restarted");
}
/******************************************************************************/
void
sig_sesman_session_end(int sig)
{
int pid;
if (g_getpid() != g_pid)
{
return;
}
pid = g_waitchild();
if (pid > 0)
{
session_kill(pid);
}
}
/******************************************************************************/
void *
sig_handler_thread(void *arg)
{
int recv_signal;
sigset_t sigmask;
sigset_t oldmask;
sigset_t waitmask;
/* mask signals to be able to wait for them... */
sigfillset(&sigmask);
/* it is a good idea not to block SIGILL SIGSEGV */
/* SIGFPE -- see sigaction(2) NOTES */
pthread_sigmask(SIG_BLOCK, &sigmask, &oldmask);
/* building the signal wait mask... */
sigemptyset(&waitmask);
sigaddset(&waitmask, SIGHUP);
sigaddset(&waitmask, SIGCHLD);
sigaddset(&waitmask, SIGTERM);
sigaddset(&waitmask, SIGINT);
// sigaddset(&waitmask, SIGFPE);
// sigaddset(&waitmask, SIGILL);
// sigaddset(&waitmask, SIGSEGV);
do
{
LOG_DEVEL(LOG_LEVEL_DEBUG, "calling sigwait()");
sigwait(&waitmask, &recv_signal);
switch (recv_signal)
{
case SIGHUP:
//reload cfg
//we must stop & restart logging, or copy logging cfg!!!!
LOG_DEVEL(LOG_LEVEL_DEBUG, "sesman received SIGHUP");
//return 0;
break;
case SIGCHLD:
/* a session died */
LOG_DEVEL(LOG_LEVEL_DEBUG, "sesman received SIGCHLD");
sig_sesman_session_end(SIGCHLD);
break;
case SIGINT:
/* we die */
LOG_DEVEL(LOG_LEVEL_DEBUG, "sesman received SIGINT");
sig_sesman_shutdown(recv_signal);
break;
case SIGTERM:
/* we die */
LOG_DEVEL(LOG_LEVEL_DEBUG, "sesman received SIGTERM");
sig_sesman_shutdown(recv_signal);
break;
}
}
while (1);
return 0;
}
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