engine: rework timer stuff, move to platform. Move debugger present checks to platform

engine/platform/linux/sys_linux.c

@@ -0,0 +1,73 @@
+/*
+sys_linux.c - Linux system utils
+Copyright (C) 2018 a1batross
+
+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 3 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.
+*/
+
+#include <time.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include "platform/platform.h"
+
+#if XASH_TIMER == TIMER_LINUX
+double Platform_DoubleTime( void )
+{
+	static longtime_t g_PerformanceFrequency;
+	static longtime_t g_ClockStart;
+	longtime_t CurrentTime;
+	struct timespec ts;
+
+	if( !g_PerformanceFrequency )
+	{
+		struct timespec res;
+		if( !clock_getres(CLOCK_MONOTONIC, &res) )
+			g_PerformanceFrequency = 1000000000LL/res.tv_nsec;
+	}
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	return (double) ts.tv_sec + (double) ts.tv_nsec/1000000000.0;
+}
+
+void Platform_Sleep( int msec )
+{
+	usleep( msec * 1000 );
+}
+#endif // XASH_TIMER == TIMER_LINUX
+
+qboolean Sys_DebuggerPresent( void )
+{
+	char buf[1024];
+
+	int status_fd = open( "/proc/self/status", O_RDONLY );
+	if ( status_fd == -1 )
+		return 0;
+
+	ssize_t num_read = read( status_fd, buf, sizeof( buf ) );
+
+	if ( num_read > 0 )
+	{
+		static const char TracerPid[] = "TracerPid:";
+		const byte *tracer_pid;
+
+		buf[num_read] = 0;
+		tracer_pid    = (const byte*)Q_strstr( buf, TracerPid );
+		if( !tracer_pid )
+			return false;
+		//printf( "%s\n", tracer_pid );
+		while( *tracer_pid < '0' || *tracer_pid > '9'  )
+			if( *tracer_pid++ == '\n' )
+				return false;
+		//printf( "%s\n", tracer_pid );
+		return !!Q_atoi( (const char*)tracer_pid );
+	}
+
+	return false;
+}