/* Copyright (C) 1995-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <sys/msg.h>

#include <ipc_priv.h>

#include <sysdep.h>

#include <errno.h>

/* Attach the shared memory segment associated with SHMID to the data

   segment of the calling process.  SHMADDR and SHMFLG determine how

   and where the segment is attached.  */

void *

shmat (int shmid, const void *shmaddr, int shmflg)

{

#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS

  return (void*) INLINE_SYSCALL_CALL (shmat, shmid, shmaddr, shmflg);

#else

  INTERNAL_SYSCALL_DECL(err);

  unsigned long resultvar;

  void *raddr;

  resultvar = INTERNAL_SYSCALL_CALL (ipc, err, IPCOP_shmat, shmid, shmflg,

				     &raddr, shmaddr);

  if (INTERNAL_SYSCALL_ERROR_P (resultvar, err))

    return (void *) INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (resultvar,

									       err));

  return raddr;

#endif

}