最新Minix3源码

				#include 				#define ptrace	_ptrace				#include 								PUBLIC long ptrace(req, pid, addr, data)				int req;				pid_t pid;				long addr;				long data;				{				  message m;								  m.m2_i1 = pid;				  m.m2_i2 = req;				  m.m2_l1 = addr;				  m.m2_l2 = data;				  if (_syscall(MM, PTRACE, &m) < 0) return(-1);								  /* There was no error, but -1 is a legal return value.  Clear errno if				   * necessary to distinguish this case.  _syscall has set errno to nonzero				   * for the error case.				   */				  if (m.m2_l2 == -1) errno = 0;				  return(m.m2_l2);				}