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ipc.h

ipc.h 2.2 KB
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  1. /* Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc.
    2. 

  2.    This file is part of the GNU C Library.
    3. 

  3. 

  4.    The GNU C Library is free software; you can redistribute it and/or
    5. 

  5.    modify it under the terms of the GNU Lesser General Public
    6. 

  6.    License as published by the Free Software Foundation; either
    7. 

  7.    version 2.1 of the License, or (at your option) any later version.
    8. 

  8. 

  9.    The GNU C Library is distributed in the hope that it will be useful,
    10. 

  10.    but WITHOUT ANY WARRANTY; without even the implied warranty of
    11. 

  11.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    12. 

  12.    Lesser General Public License for more details.
    13. 

  13. 

  14.    You should have received a copy of the GNU Lesser General Public
    15. 

  15.    License along with the GNU C Library; if not, see
    16. 

  16.    <http://www.gnu.org/licenses/>.  */
    17. 

  17. 

  18. #ifndef _SYS_IPC_H
    19. 

  19. # error "Never use <bits/ipc.h> directly; include <sys/ipc.h> instead."
    20. 

  20. #endif
    21. 

  21. 

  22. #include <bits/types.h>
    23. 

  23. #include <bits/wordsize.h>
    24. 

  24. 

  25. /* Mode bits for `msgget', `semget', and `shmget'.  */
    26. 

  26. #define IPC_CREAT	01000		/* Create key if key does not exist. */
    27. 

  27. #define IPC_EXCL	02000		/* Fail if key exists.  */
    28. 

  28. #define IPC_NOWAIT	04000		/* Return error on wait.  */
    29. 

  29. 

  30. /* Control commands for `msgctl', `semctl', and `shmctl'.  */
    31. 

  31. #define IPC_RMID	0		/* Remove identifier.  */
    32. 

  32. #define IPC_SET		1		/* Set `ipc_perm' options.  */
    33. 

  33. #define IPC_STAT	2		/* Get `ipc_perm' options.  */
    34. 

  34. #ifdef __USE_GNU
    35. 

  35. # define IPC_INFO	3		/* See ipcs.  */
    36. 

  36. #endif
    37. 

  37. 

  38. /* Special key values.  */
    39. 

  39. #define IPC_PRIVATE	((__key_t) 0)	/* Private key.  */
    40. 

  40. 

  41. 

  42. /* Data structure used to pass permission information to IPC operations.  */
    43. 

  43. struct ipc_perm
    44. 

  44.   {
    45. 

  45.     __key_t __key;			/* Key.  */
    46. 

  46.     __uid_t uid;			/* Owner's user ID.  */
    47. 

  47.     __gid_t gid;			/* Owner's group ID.  */
    48. 

  48.     __uid_t cuid;			/* Creator's user ID.  */
    49. 

  49.     __gid_t cgid;			/* Creator's group ID.  */
    50. 

  50. #if __WORDSIZE == 32
    51. 

  51.     unsigned short int __pad1;
    52. 

  52.     unsigned short int mode;		/* Read/write permission.  */
    53. 

  53.     unsigned short int __pad2;
    54. 

  54. #else
    55. 

  55.     __mode_t mode;			/* Read/write permission.  */
    56. 

  56.     unsigned short int __pad1;
    57. 

  57. #endif
    58. 

  58.     unsigned short int __seq;		/* Sequence number.  */
    59. 

  59.     unsigned long long int __unused1;
    60. 

  60.     unsigned long long int __unused2;
    61. 

  61.   };
    62.