const char *procexepath_() {
	static char h[_MAX_PATH + 1];
	ONCELOCK {
		char link[100];
		sprintf(link, "/proc/%d/exe", getpid());
		int ret = readlink(link, h, _MAX_PATH);
		if(ret > 0 && ret < _MAX_PATH)
			h[ret] = '\0';
		else
			*h = '\0';
	}
	return h;
}

String GetExeFilePath()
{
	static String exepath;
	ONCELOCK {
		const char *exe = procexepath_();
		if(exe)
			exepath = exe;
		else {
			String x = Argv0__;
			if(IsFullPath(x) && FileExists(x))
				exepath = x;
			else {
				exepath = GetHomeDirFile("upp");
				Vector<String> p = Split(FromSystemCharset(Environment().Get("PATH")), ':');
				if(x.Find('/') >= 0)
					p.Add(GetCurrentDirectory());
				for(int i = 0; i < p.GetCount(); i++) {
					String ep = NormalizePath(AppendFileName(p[i], x));
					if(FileExists(ep))
						exepath = ep;
				}
			}
		}
	}
	return exepath;
}