module os

#include <sys/ptrace.h>

fn C.ptrace(int, u32, voidptr, int) int

// debugger_present returns a bool indicating if the process is being debugged.
pub fn debugger_present() bool {
	$if freebsd {
		// check if a child process could trace its parent process,
		// if not a debugger must be present
		pid := fork()
		if pid == 0 {
			ppid := getppid()
			if C.ptrace(C.PT_TRACE_ME, ppid, unsafe { nil }, 0) == 0 {
				C.waitpid(ppid, 0, 0)

				// detach ptrace, otherwise further checks would indicate a debugger is present (ptrace is the Debugger then)
				C.ptrace(C.PT_DETACH, ppid, 0, 0)

				// no external debugger
				exit(0)
			} else {
				// an error occurred, a external debugger must be present
				exit(1)
			}
		} else {
			mut status := 0
			// wait until the child process dies
			C.waitpid(pid, &status, 0)
			// check the exit code of the child process check
			if C.WEXITSTATUS(status) == 0 {
				return false
			} else {
				return true
			}
		}
	}
	return false
}