engine: implemented handling SIGTERM signal for proper stopping dedic…

…ated server

engine/common/host.c

@@ -1072,6 +1072,9 @@ static void Host_InitCommon( int argc, char **argv, const char *progname, qboole
 		Host_RunTests( 0 );
 #endif
 
+#if XASH_DEDICATED
+	Platform_SetupSigtermHandling();
+#endif
 	Platform_Init( Host_IsDedicated( ) || developer >= DEV_EXTENDED );
 	FS_Init( basedir );
 

engine/platform/platform.h

@@ -51,6 +51,7 @@ void IOS_LaunchDialog( void );
 
 #if XASH_POSIX
 void Posix_Daemonize( void );
+void Posix_SetupSigtermHandling( void );
 #endif
 
 #if XASH_SDL
@@ -156,6 +157,13 @@ static inline qboolean Sys_DebuggerPresent( void )
 #endif
 }
 
+static inline void Platform_SetupSigtermHandling( void )
+{
+#if XASH_POSIX
+	Posix_SetupSigtermHandling( );
+#endif
+}
+
 /*
 ==============================================================================
 

engine/platform/posix/sys_posix.c

@@ -18,6 +18,7 @@ GNU General Public License for more details.
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <errno.h>
+#include <signal.h>
 #include "platform/platform.h"
 #include "menu_int.h"
 
@@ -145,6 +146,16 @@ void Posix_Daemonize( void )
 
 }
 
+static void Posix_SigtermCallback( int signum )
+{
+	Sys_Quit();
+}
+
+void Posix_SetupSigtermHandling( void )
+{
+	signal( SIGTERM, Posix_SigtermCallback );
+}
+
 #if XASH_TIMER == TIMER_POSIX
 double Platform_DoubleTime( void )
 {