msq.h 2.5 KB

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  1. /* Copyright (C) 1995, 1996, 1997, 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_MSG_H
  15. # error "Never use <bits/msq.h> directly; include <sys/msg.h> instead."
  16. #endif
  17. #include <bits/types.h>
  18. #include <bits/wordsize.h>
  19. /* Define options for message queue functions. */
  20. #define MSG_NOERROR 010000 /* no error if message is too big */
  21. #ifdef __USE_GNU
  22. # define MSG_EXCEPT 020000 /* recv any msg except of specified type */
  23. #endif
  24. /* Types used in the structure definition. */
  25. typedef unsigned long int msgqnum_t;
  26. typedef unsigned long int msglen_t;
  27. /* Structure of record for one message inside the kernel.
  28. The type `struct msg' is opaque. */
  29. struct msqid_ds
  30. {
  31. struct ipc_perm msg_perm; /* structure describing operation permission */
  32. #if __WORDSIZE == 32
  33. unsigned int __pad1;
  34. #endif
  35. __time_t msg_stime; /* time of last msgsnd command */
  36. #if __WORDSIZE == 32
  37. unsigned int __pad2;
  38. #endif
  39. __time_t msg_rtime; /* time of last msgrcv command */
  40. #if __WORDSIZE == 32
  41. unsigned int __pad3;
  42. #endif
  43. __time_t msg_ctime; /* time of last change */
  44. unsigned long int __msg_cbytes; /* current number of bytes on queue */
  45. msgqnum_t msg_qnum; /* number of messages currently on queue */
  46. msglen_t msg_qbytes; /* max number of bytes allowed on queue */
  47. __pid_t msg_lspid; /* pid of last msgsnd() */
  48. __pid_t msg_lrpid; /* pid of last msgrcv() */
  49. unsigned long int __unused1;
  50. unsigned long int __unused2;
  51. };
  52. #ifdef __USE_MISC
  53. # define msg_cbytes __msg_cbytes
  54. /* ipcs ctl commands */
  55. # define MSG_STAT 11
  56. # define MSG_INFO 12
  57. /* buffer for msgctl calls IPC_INFO, MSG_INFO */
  58. struct msginfo
  59. {
  60. int msgpool;
  61. int msgmap;
  62. int msgmax;
  63. int msgmnb;
  64. int msgmni;
  65. int msgssz;
  66. int msgtql;
  67. unsigned short int msgseg;
  68. };
  69. #endif /* __USE_MISC */