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glibc  2.9
Functions
setresuid.c File Reference
#include <errno.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/id.h>

Go to the source code of this file.

Functions

int __setresuid (uid_t ruid, uid_t euid, uid_t suid)

Function Documentation

int __setresuid ( uid_t  ruid,
uid_t  euid,
uid_t  suid 
)

Definition at line 28 of file setresuid.c.

{
  auth_t newauth;
  error_t err;
  uid_t auids[2] = { ruid, suid };

  HURD_CRITICAL_BEGIN;
  __mutex_lock (&_hurd_id.lock);
  err = _hurd_check_ids ();

  if (!err)
    {
      /* Make a new auth handle which has EUID as the first element in the
         list of effective uids.  */

      if (_hurd_id.gen.nuids > 0)
       {
         _hurd_id.gen.uids[0] = euid;
         _hurd_id.valid = 0;
       }
      if (_hurd_id.aux.nuids > 1)
       {
         _hurd_id.aux.uids[0] = ruid;
         _hurd_id.aux.uids[1] = suid;
         _hurd_id.valid = 0;
       }

      err = __USEPORT (AUTH, __auth_makeauth
                     (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
                     _hurd_id.gen.nuids ? _hurd_id.gen.uids : &euid,
                     _hurd_id.gen.nuids ?: 1,
                     _hurd_id.aux.nuids > 1 ? _hurd_id.aux.uids : auids,
                     _hurd_id.aux.nuids > 1 ? _hurd_id.aux.nuids : 2,
                     _hurd_id.gen.gids, _hurd_id.gen.ngids,
                     _hurd_id.aux.gids, _hurd_id.aux.ngids,
                     &newauth));
    }

  __mutex_unlock (&_hurd_id.lock);
  HURD_CRITICAL_END;

  if (err)
    return __hurd_fail (err);

  /* Install the new handle and reauthenticate everything.  */
  err = __setauth (newauth);
  __mach_port_deallocate (__mach_task_self (), newauth);
  return err;
}

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