msg.h 3.3 KB

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  1. #ifndef _LINUX_MSG_H
  2. #define _LINUX_MSG_H
  3. #include <linux/ipc.h>
  4. /* ipcs ctl commands */
  5. #define MSG_STAT 11
  6. #define MSG_INFO 12
  7. /* msgrcv options */
  8. #define MSG_NOERROR 010000 /* no error if message is too big */
  9. #define MSG_EXCEPT 020000 /* recv any msg except of specified type.*/
  10. /* Obsolete, used only for backwards compatibility and libc5 compiles */
  11. struct msqid_ds {
  12. struct ipc_perm msg_perm;
  13. struct msg *msg_first; /* first message on queue,unused */
  14. struct msg *msg_last; /* last message in queue,unused */
  15. __kernel_time_t msg_stime; /* last msgsnd time */
  16. __kernel_time_t msg_rtime; /* last msgrcv time */
  17. __kernel_time_t msg_ctime; /* last change time */
  18. unsigned long msg_lcbytes; /* Reuse junk fields for 32 bit */
  19. unsigned long msg_lqbytes; /* ditto */
  20. unsigned short msg_cbytes; /* current number of bytes on queue */
  21. unsigned short msg_qnum; /* number of messages in queue */
  22. unsigned short msg_qbytes; /* max number of bytes on queue */
  23. __kernel_ipc_pid_t msg_lspid; /* pid of last msgsnd */
  24. __kernel_ipc_pid_t msg_lrpid; /* last receive pid */
  25. };
  26. /* Include the definition of msqid64_ds */
  27. #include <asm/msgbuf.h>
  28. /* message buffer for msgsnd and msgrcv calls */
  29. struct msgbuf {
  30. long mtype; /* type of message */
  31. char mtext[1]; /* message text */
  32. };
  33. /* buffer for msgctl calls IPC_INFO, MSG_INFO */
  34. struct msginfo {
  35. int msgpool;
  36. int msgmap;
  37. int msgmax;
  38. int msgmnb;
  39. int msgmni;
  40. int msgssz;
  41. int msgtql;
  42. unsigned short msgseg;
  43. };
  44. #define MSGMNI 16 /* <= IPCMNI */ /* max # of msg queue identifiers */
  45. #define MSGMAX 8192 /* <= INT_MAX */ /* max size of message (bytes) */
  46. #define MSGMNB 16384 /* <= INT_MAX */ /* default max size of a message queue */
  47. /* unused */
  48. #define MSGPOOL (MSGMNI*MSGMNB/1024) /* size in kilobytes of message pool */
  49. #define MSGTQL MSGMNB /* number of system message headers */
  50. #define MSGMAP MSGMNB /* number of entries in message map */
  51. #define MSGSSZ 16 /* message segment size */
  52. #define __MSGSEG ((MSGPOOL*1024)/ MSGSSZ) /* max no. of segments */
  53. #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
  54. #ifdef __KERNEL__
  55. #include <linux/list.h>
  56. /* one msg_msg structure for each message */
  57. struct msg_msg {
  58. struct list_head m_list;
  59. long m_type;
  60. int m_ts; /* message text size */
  61. struct msg_msgseg* next;
  62. void *security;
  63. /* the actual message follows immediately */
  64. };
  65. /* one msq_queue structure for each present queue on the system */
  66. struct msg_queue {
  67. struct kern_ipc_perm q_perm;
  68. int q_id;
  69. time_t q_stime; /* last msgsnd time */
  70. time_t q_rtime; /* last msgrcv time */
  71. time_t q_ctime; /* last change time */
  72. unsigned long q_cbytes; /* current number of bytes on queue */
  73. unsigned long q_qnum; /* number of messages in queue */
  74. unsigned long q_qbytes; /* max number of bytes on queue */
  75. pid_t q_lspid; /* pid of last msgsnd */
  76. pid_t q_lrpid; /* last receive pid */
  77. struct list_head q_messages;
  78. struct list_head q_receivers;
  79. struct list_head q_senders;
  80. };
  81. /* Helper routines for sys_msgsnd and sys_msgrcv */
  82. extern long do_msgsnd(int msqid, long mtype, void __user *mtext,
  83. size_t msgsz, int msgflg);
  84. extern long do_msgrcv(int msqid, long *pmtype, void __user *mtext,
  85. size_t msgsz, long msgtyp, int msgflg);
  86. #endif /* __KERNEL__ */
  87. #endif /* _LINUX_MSG_H */