ipc.h 1.9 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849
  1. /* Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Library General Public License as
  5. published by the Free Software Foundation; either version 2 of the
  6. License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Library General Public License for more details.
  11. You should have received a copy of the GNU Library General Public
  12. License along with the GNU C Library; see the file COPYING.LIB. If not,
  13. see <http://www.gnu.org/licenses/>. */
  14. #ifndef _SYS_IPC_H
  15. # error "Never use <bits/ipc.h> directly; include <sys/ipc.h> instead."
  16. #endif
  17. #include <sys/types.h>
  18. /* Mode bits for `msgget', `semget', and `shmget'. */
  19. #define IPC_CREAT 01000 /* Create key if key does not exist. */
  20. #define IPC_EXCL 02000 /* Fail if key exists. */
  21. #define IPC_NOWAIT 04000 /* Return error on wait. */
  22. /* Control commands for `msgctl', `semctl', and `shmctl'. */
  23. #define IPC_RMID 0 /* Remove identifier. */
  24. #define IPC_SET 1 /* Set `ipc_perm' options. */
  25. #define IPC_STAT 2 /* Get `ipc_perm' options. */
  26. #define IPC_INFO 3 /* See ipcs. */
  27. /* Special key values. */
  28. #define IPC_PRIVATE ((__key_t) 0) /* Private key. */
  29. /* Data structure used to pass permission information to IPC operations. */
  30. struct ipc_perm
  31. {
  32. __key_t __key; /* Key. */
  33. unsigned short int uid; /* Owner's user ID. */
  34. unsigned short int gid; /* Owner's group ID. */
  35. unsigned short int cuid; /* Creator's user ID. */
  36. unsigned short int cgid; /* Creator's group ID. */
  37. unsigned short int mode; /* Read/write permission. */
  38. unsigned short int __seq; /* Sequence number. */
  39. };