fix for Linux

src/scripts/demos/simple_000.lua

@@ -31,6 +31,7 @@ w.on_update = function(self)
 
 end
 
+-- show all displays
 local ds = pw.display:all()
 for i = 1,#ds do
     print("display ",i,ds[i].name)

src/system/src/path.cpp

@@ -12,7 +12,7 @@
 		#include <mach/mach.h>
 	#endif
 //	#include "_host/helpers_osx.h"
-#elif defined(TP_HAVE_UNISTD_H)
+#elif defined(__USE_POSIX)
 	#include <unistd.h>
 #else
 	// Unknown platform
@@ -57,9 +57,6 @@ std::string path::executable_path()
 {
 	std::string result;
 
-	const unsigned int MAXPATHLEN = 2048;
-	static char path[MAXPATHLEN];
-	memset(&path[0],0,MAXPATHLEN);
 
 #if defined(__APPLE__)
 	CFURLRef bundleURL;
@@ -79,9 +76,11 @@ std::string path::executable_path()
 	static TCHAR lpFname[MAXPATHLEN];
 	DWORD ret = GetModuleFileName( NULL, &lpFname[0], MAXPATHLEN );
 	result.assign(&lpFname[0]);
-#else
-	readlink("/proc/self/exe", path, sizeof(path));
-	result.assign(path);
+#elif defined(__USE_POSIX)
+    const size_t MAXPATHLEN = 2048;
+    std::vector<char> buf(MAXPATHLEN);
+    readlink("/proc/self/exe", buf.data(), buf.size());
+    result.assign(buf.data());
 #endif
 	return result;
 }