msq.h 2.5 KB

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  1. /* Copyright (C) 1995, 1996, 1997, 2000, 2002 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_MSG_H
  15. # error "Never use <bits/msq.h> directly; include <sys/msg.h> instead."
  16. #endif
  17. #include <bits/types.h>
  18. /* Define options for message queue functions. */
  19. #define MSG_NOERROR 010000 /* no error if message is too big */
  20. #ifdef __USE_GNU
  21. # define MSG_EXCEPT 020000 /* recv any msg except of specified type */
  22. #endif
  23. /* Types used in the structure definition. */
  24. typedef unsigned long int msgqnum_t;
  25. typedef unsigned long int msglen_t;
  26. /* Structure of record for one message inside the kernel.
  27. The type `struct msg' is opaque. */
  28. struct msqid_ds
  29. {
  30. struct ipc_perm msg_perm; /* structure describing operation permission */
  31. #if __WORDSIZE == 32
  32. unsigned int __unused1;
  33. #endif
  34. __time_t msg_stime; /* time of last msgsnd command */
  35. #if __WORDSIZE == 32
  36. unsigned int __unused2;
  37. #endif
  38. __time_t msg_rtime; /* time of last msgrcv command */
  39. #if __WORDSIZE == 32
  40. unsigned int __unused3;
  41. #endif
  42. __time_t msg_ctime; /* time of last change */
  43. unsigned long __msg_cbytes; /* current number of bytes on queue */
  44. msgqnum_t msg_qnum; /* number of messages currently on queue */
  45. msglen_t msg_qbytes; /* max number of bytes allowed on queue */
  46. __pid_t msg_lspid; /* pid of last msgsnd() */
  47. __pid_t msg_lrpid; /* pid of last msgrcv() */
  48. unsigned long __unused4;
  49. unsigned long __unused5;
  50. };
  51. #ifdef __USE_MISC
  52. # define msg_cbytes __msg_cbytes
  53. /* ipcs ctl commands */
  54. # define MSG_STAT 11
  55. # define MSG_INFO 12
  56. /* buffer for msgctl calls IPC_INFO, MSG_INFO */
  57. struct msginfo
  58. {
  59. int msgpool;
  60. int msgmap;
  61. int msgmax;
  62. int msgmnb;
  63. int msgmni;
  64. int msgssz;
  65. int msgtql;
  66. unsigned short int msgseg;
  67. };
  68. #endif /* __USE_MISC */