1#include <sys/ptrace.h>
2#include <stdarg.h>
3#include <unistd.h>
4#include "syscall.h"
5
6long ptrace(int req, ...)
7{
8	va_list ap;
9	pid_t pid;
10	void *addr, *data, *addr2;
11	long ret, result;
12
13	va_start(ap, req);
14	pid = va_arg(ap, pid_t);
15	addr = va_arg(ap, void *);
16	data = va_arg(ap, void *);
17	addr2 = va_arg(ap, void *);
18	va_end(ap);
19
20	if (req-1U < 3) data = &result;
21	ret = syscall(SYS_ptrace, req, pid, addr, data, addr2);
22
23	if (ret < 0 || req-1U >= 3) return ret;
24	return result;
25}
26