1  /* Header for directory for shm/sem files.
       2     Copyright (C) 2014-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _SHM_DIRECTORY_H
      20  
      21  #include <limits.h>
      22  #include <paths.h>
      23  #include <stdbool.h>
      24  
      25  /* The directory that contains shared POSIX objects.  */
      26  #define SHMDIR _PATH_DEV "shm/"
      27  
      28  struct shmdir_name
      29  {
      30    /* The combined prefix/name.  The sizeof includes the terminating
      31       NUL byte.  4 bytes are needed for the optional "sem." prefix.  */
      32    char name[sizeof (SHMDIR) + 4 + NAME_MAX];
      33  };
      34  
      35  /* Sets RESULT->name to the constructed name and returns 0 on success,
      36     or -1 on failure.  Includes the "sem." prefix in the name if
      37     SEM_PREFIX is true.  */
      38  int __shm_get_name (struct shmdir_name *result, const char *name,
      39  		    bool sem_prefix);
      40  libc_hidden_proto (__shm_get_name)
      41  
      42  #endif  /* shm-directory.h */