Back to index

glibc  2.9
Functions
setreuid.c File Reference
#include <errno.h>
#include <sys/types.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/id.h>
#include <string.h>

Go to the source code of this file.

Functions

int __setreuid (uid_t ruid, uid_t euid)

Function Documentation

int __setreuid ( uid_t  ruid,
uid_t  euid 
)

Definition at line 27 of file setreuid.c.

{
  auth_t newauth;
  error_t err;

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

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

      uid_t *newgen, *newaux;
      size_t ngen, naux;

      newgen = _hurd_id.gen.uids;
      ngen = _hurd_id.gen.nuids;
      if (euid != -1)
       {
         if (_hurd_id.gen.nuids == 0)
           {
             /* No effective uids now.  The new set will be just UID.  */
             newgen = &euid;
             ngen = 1;
           }
         else
           {
             _hurd_id.gen.uids[0] = euid;
             _hurd_id.valid = 0;
           }
       }

      newaux = _hurd_id.aux.uids;
      naux = _hurd_id.aux.nuids;
      if (ruid != -1)
       {
         if (_hurd_id.aux.nuids == 0)
           {
             newaux = &ruid;
             naux = 1;
           }
         else
           {
             _hurd_id.aux.uids[0] = ruid;
             _hurd_id.valid = 0;
           }
       }

      err = __USEPORT (AUTH, __auth_makeauth
                     (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
                     newgen, ngen, newaux, naux,
                     _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;
}

Here is the call graph for this function: