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glibc  2.9
Functions
setresgid.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 __setresgid (gid_t rgid, gid_t egid, gid_t sgid)

Function Documentation

int __setresgid ( gid_t  rgid,
gid_t  egid,
gid_t  sgid 
)

Definition at line 28 of file setresgid.c.

{
  auth_t newauth;
  error_t err;
  gid_t agids[2] = { rgid, sgid };

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

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

      if (_hurd_id.gen.ngids > 0)
       {
         _hurd_id.gen.gids[0] = egid;
         _hurd_id.valid = 0;
       }
      if (_hurd_id.aux.ngids > 1)
       {
         _hurd_id.aux.gids[0] = rgid;
         _hurd_id.aux.gids[1] = sgid;
         _hurd_id.valid = 0;
       }

      err = __USEPORT (AUTH, __auth_makeauth
                     (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
                     _hurd_id.gen.uids, _hurd_id.gen.nuids,
                     _hurd_id.aux.uids, _hurd_id.aux.nuids,
                     _hurd_id.gen.ngids ? _hurd_id.gen.gids : &egid,
                     _hurd_id.gen.ngids ?: 1,
                     _hurd_id.aux.ngids > 1 ? _hurd_id.aux.gids : agids,
                     _hurd_id.aux.ngids > 1 ? _hurd_id.aux.ngids : 2,
                     &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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