Back to index

glibc  2.9
Functions
ptrace.c File Reference
#include <errno.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/user.h>
#include <stdarg.h>
#include <signal.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <bp-checks.h>

Go to the source code of this file.

Functions

long int ptrace (enum __ptrace_request request,...)

Function Documentation

long int ptrace ( enum __ptrace_request  request,
  ... 
)

Definition at line 31 of file ptrace.c.

{
  long int res, ret;
  va_list ap;
  pid_t pid;
  void *addr, *data;

  va_start (ap, request);
  pid = va_arg (ap, pid_t);
  addr = va_arg (ap, void *);
  data = va_arg (ap, void *);
  va_end (ap);

  if (request > 0 && request < 4)
    data = &ret;

#if __BOUNDED_POINTERS__
  switch (request)
    {
    case PTRACE_PEEKTEXT:
    case PTRACE_PEEKDATA:
    case PTRACE_PEEKUSER:
    case PTRACE_POKETEXT:
    case PTRACE_POKEDATA:
    case PTRACE_POKEUSER:
      (void) CHECK_1 ((int *) addr);
      (void) CHECK_1 ((int *) data);
      break;

    case PTRACE_GETREGS:
    case PTRACE_SETREGS:
#ifdef __i386__
      (void) CHECK_1 ((struct user_regs_struct *) data);
#else
      /* We don't know the size of data, so the best we can do is ensure
        that `data' is valid for at least one word.  */
      (void) CHECK_1 ((int *) data);
#endif
      break;

    case PTRACE_GETFPREGS:
    case PTRACE_SETFPREGS:
#ifdef __i386__
      (void) CHECK_1 ((struct user_fpregs_struct *) data);
#else
      /* We don't know the size of data, so the best we can do is ensure
        that `data' is valid for at least one word.  */
      (void) CHECK_1 ((int *) data);
#endif
      break;

    case PTRACE_GETFPXREGS:
    case PTRACE_SETFPXREGS:
#ifdef __i386__
      (void) CHECK_1 ((struct user_fpxregs_struct *) data);
#else
      /* We don't know the size of data, so the best we can do is ensure
        that `data' is valid for at least one word.  */
      (void) CHECK_1 ((int *) data);
#endif
      break;

    case PTRACE_GETSIGINFO:
    case PTRACE_SETSIGINFO:
      (void) CHECK_1 ((siginfo_t *) data);
      break;

    case PTRACE_GETEVENTMSG:
      (void) CHECK_1 ((unsigned long *) data);
      break;

    case PTRACE_SETOPTIONS:
      (void) CHECK_1 ((long *) data);
      break;

    case PTRACE_TRACEME:
    case PTRACE_CONT:
    case PTRACE_KILL:
    case PTRACE_SINGLESTEP:
    case PTRACE_ATTACH:
    case PTRACE_DETACH:
    case PTRACE_SYSCALL:
      /* Neither `data' nor `addr' needs any checks.  */
      break;
    };
#endif

  res = INLINE_SYSCALL (ptrace, 4, request, pid,
                     __ptrvalue (addr), __ptrvalue (data));
  if (res >= 0 && request > 0 && request < 4)
    {
      __set_errno (0);
      return ret;
    }

  return res;
}

Here is the call graph for this function: