ipc.h 2.1 KB

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  1. /* Copyright (C) 1995-1999, 2000 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 Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the 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. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, see
  13. <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 <bits/types.h>
  18. #include <bits/wordsize.h>
  19. /* Mode bits for `msgget', `semget', and `shmget'. */
  20. #define IPC_CREAT 01000 /* Create key if key does not exist. */
  21. #define IPC_EXCL 02000 /* Fail if key exists. */
  22. #define IPC_NOWAIT 04000 /* Return error on wait. */
  23. /* Control commands for `msgctl', `semctl', and `shmctl'. */
  24. #define IPC_RMID 0 /* Remove identifier. */
  25. #define IPC_SET 1 /* Set `ipc_perm' options. */
  26. #define IPC_STAT 2 /* Get `ipc_perm' options. */
  27. #ifdef __USE_GNU
  28. # define IPC_INFO 3 /* See ipcs. */
  29. #endif
  30. /* Special key values. */
  31. #define IPC_PRIVATE ((__key_t) 0) /* Private key. */
  32. /* Data structure used to pass permission information to IPC operations. */
  33. struct ipc_perm
  34. {
  35. __key_t __key; /* Key. */
  36. __uid_t uid; /* Owner's user ID. */
  37. __gid_t gid; /* Owner's group ID. */
  38. __uid_t cuid; /* Creator's user ID. */
  39. __gid_t cgid; /* Creator's group ID. */
  40. #if __WORDSIZE == 64
  41. unsigned int mode;
  42. #else
  43. unsigned short int mode; /* Read/write permission. */
  44. unsigned short int __pad1;
  45. #endif
  46. unsigned short int __seq; /* Sequence number. */
  47. unsigned short int __pad2;
  48. unsigned long int __unused1;
  49. unsigned long int __unused2;
  50. };