lib/libc/sys-minix/ptrace.c

   1 #include <sys/cdefs.h>
   2 #include "namespace.h"
   3 #include <lib.h>
   4
   5 #include <sys/ptrace.h>
   6
   7 #ifdef __weak_alias
   8 __weak_alias(ptrace, _ptrace)
   9 #endif
  10
  11 long ptrace(int req, pid_t pid, long addr, long data)
  12 {
  13   message m;
  14
  15   m.m2_i1 = pid;
  16   m.m2_i2 = req;
  17   m.PMTRACE_ADDR = addr;
  18   m.m2_l2 = data;
  19   if (_syscall(PM_PROC_NR, PTRACE, &m) < 0) return(-1);
  20
  21   /* There was no error, but -1 is a legal return value.  Clear errno if
  22    * necessary to distinguish this case.  _syscall has set errno to nonzero
  23    * for the error case.
  24    */
  25   if (m.m2_l2 == -1) errno = 0;
  26   return(m.m2_l2);
  27 }