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glibc  2.9
Functions
ioperm.c File Reference
#include <sys/io.h>
#include <hurd.h>
#include <mach/i386/mach_i386.h>

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Functions

int ioperm (unsigned long int from, unsigned long int num, int turn_on)

Function Documentation

int ioperm ( unsigned long int  from,
unsigned long int  num,
int  turn_on 
)

Definition at line 25 of file ioperm.c.

{
#if ! HAVE_I386_IO_PERM_MODIFY
  return __hurd_fail (ENOSYS);
#else
  error_t err;
  device_t devmaster;

  /* With the device master port we get a capability that represents
     this range of io ports.  */
  err = __get_privileged_ports (NULL, &devmaster);
  if (! err)
    {
      io_perm_t perm;
      err = __i386_io_perm_create (devmaster, from, from + num - 1, &perm);
      __mach_port_deallocate (__mach_task_self (), devmaster);
      if (! err)
       {
         /* Now we add or remove that set from our task's bitmap.  */
         err = __i386_io_perm_modify (__mach_task_self (), perm, turn_on);
         __mach_port_deallocate (__mach_task_self (), perm);
       }

      if (err == MIG_BAD_ID)       /* Old kernels don't have these RPCs.  */
       err = ENOSYS;
    }

  return err ? __hurd_fail (err) : 0;
#endif
}

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