1  /* Copyright (C) 1995-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <ipc_priv.h>
      19  #include <sysdep.h>
      20  #include <errno.h>
      21  
      22  /* Attach the shared memory segment associated with SHMID to the data
      23     segment of the calling process.  SHMADDR and SHMFLG determine how
      24     and where the segment is attached.  */
      25  
      26  void *
      27  shmat (int shmid, const void *shmaddr, int shmflg)
      28  {
      29  #ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
      30    return (void*) INLINE_SYSCALL_CALL (shmat, shmid, shmaddr, shmflg);
      31  #else
      32    unsigned long resultvar;
      33    void *raddr;
      34  
      35    resultvar = INTERNAL_SYSCALL_CALL (ipc, IPCOP_shmat, shmid, shmflg,
      36  				     &raddr, shmaddr);
      37    if (INTERNAL_SYSCALL_ERROR_P (resultvar))
      38      return (void *) INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (resultvar));
      39  
      40    return raddr;
      41  #endif
      42  }