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xrdp-proprietary/sesman/sig.c

197 lines
4.9 KiB

19 years ago
/*
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 2005-2010
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*/
/**
*
* @file sig.c
* @brief signal handling functions
* @author Jay Sorg, Simone Fedele
*
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*/
#include "sesman.h"
#include "signal.h"
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extern int g_sck;
extern int g_pid;
extern struct config_sesman* g_cfg; /* in sesman.c */
extern tbus g_term_event;
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/******************************************************************************/
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void DEFAULT_CC
sig_sesman_shutdown(int sig)
{
char pid_file[256];
log_message(&(g_cfg->log), LOG_LEVEL_INFO, "shutting down sesman %d", 1);
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if (g_getpid() != g_pid)
{
LOG_DBG(&(g_cfg->log), "g_getpid() [%d] differs from g_pid [%d]", (g_getpid()), g_pid);
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return;
}
LOG_DBG(&(g_cfg->log), " - getting signal %d pid %d", sig, g_getpid());
g_set_wait_obj(g_term_event);
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g_tcp_close(g_sck);
session_sigkill_all();
g_snprintf(pid_file, 255, "%s/xrdp-sesman.pid", XRDP_PID_PATH);
g_file_delete(pid_file);
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}
/******************************************************************************/
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void DEFAULT_CC
sig_sesman_reload_cfg(int sig)
{
int error;
struct config_sesman *cfg;
log_message(&(g_cfg->log), LOG_LEVEL_WARNING, "receiving SIGHUP %d", 1);
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if (g_getpid() != g_pid)
{
LOG_DBG(&(g_cfg->log), "g_getpid() [%d] differs from g_pid [%d]", g_getpid(), g_pid);
return;
}
cfg = g_malloc(sizeof(struct config_sesman), 1);
if (0 == cfg)
{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "error creating new config: - keeping old cfg");
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return;
}
if (config_read(cfg) != 0)
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{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "error reading config - keeping old cfg");
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return;
}
/* stop logging subsystem */
log_end(&(g_cfg->log));
/* replace old config with new readed one */
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g_cfg = cfg;
/* start again logging subsystem */
error = log_start(&(g_cfg->log));
if (error != LOG_STARTUP_OK)
{
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", g_cfg->log.log_file);
break;
}
}
log_message(&(g_cfg->log), LOG_LEVEL_INFO, "configuration reloaded, log subsystem restarted");
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}
/******************************************************************************/
void DEFAULT_CC
sig_sesman_session_end(int sig)
{
int pid;
if (g_getpid() != g_pid)
{
return;
}
pid = g_waitchild();
if (pid > 0)
{
session_kill(pid);
}
}
/******************************************************************************/
void* DEFAULT_CC
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, SIGKILL);
sigaddset(&waitmask, SIGINT);
// sigaddset(&waitmask, SIGFPE);
// sigaddset(&waitmask, SIGILL);
// sigaddset(&waitmask, SIGSEGV);
do
{
LOG_DBG(&(g_cfg->log), "calling sigwait()",0);
sigwait(&waitmask, &recv_signal);
switch (recv_signal)
{
case SIGHUP:
//reload cfg
//we must stop & restart logging, or copy logging cfg!!!!
LOG_DBG(&(g_cfg->log), "sesman received SIGHUP", 0);
//return 0;
break;
case SIGCHLD:
/* a session died */
LOG_DBG(&(g_cfg->log), "sesman received SIGCHLD", 0);
sig_sesman_session_end(SIGCHLD);
break;
case SIGINT:
/* we die */
LOG_DBG(&(g_cfg->log), "sesman received SIGINT", 0);
sig_sesman_shutdown(recv_signal);
break;
case SIGKILL:
/* we die */
LOG_DBG(&(g_cfg->log), "sesman received SIGKILL", 0);
sig_sesman_shutdown(recv_signal);
break;
case SIGTERM:
/* we die */
LOG_DBG(&(g_cfg->log), "sesman received SIGTERM", 0);
sig_sesman_shutdown(recv_signal);
break;
}
} while (1);
return 0;
}