Linux v2.6.15-rc7
[pohmelfs.git] / include / linux / msg.h
blob903e0ab8101fad230721c7ecd27653b413a5d058
1 #ifndef _LINUX_MSG_H
2 #define _LINUX_MSG_H
4 #include <linux/ipc.h>
5 #include <linux/list.h>
7 /* ipcs ctl commands */
8 #define MSG_STAT 11
9 #define MSG_INFO 12
11 /* msgrcv options */
12 #define MSG_NOERROR 010000 /* no error if message is too big */
13 #define MSG_EXCEPT 020000 /* recv any msg except of specified type.*/
15 /* Obsolete, used only for backwards compatibility and libc5 compiles */
16 struct msqid_ds {
17 struct ipc_perm msg_perm;
18 struct msg *msg_first; /* first message on queue,unused */
19 struct msg *msg_last; /* last message in queue,unused */
20 __kernel_time_t msg_stime; /* last msgsnd time */
21 __kernel_time_t msg_rtime; /* last msgrcv time */
22 __kernel_time_t msg_ctime; /* last change time */
23 unsigned long msg_lcbytes; /* Reuse junk fields for 32 bit */
24 unsigned long msg_lqbytes; /* ditto */
25 unsigned short msg_cbytes; /* current number of bytes on queue */
26 unsigned short msg_qnum; /* number of messages in queue */
27 unsigned short msg_qbytes; /* max number of bytes on queue */
28 __kernel_ipc_pid_t msg_lspid; /* pid of last msgsnd */
29 __kernel_ipc_pid_t msg_lrpid; /* last receive pid */
32 /* Include the definition of msqid64_ds */
33 #include <asm/msgbuf.h>
35 /* message buffer for msgsnd and msgrcv calls */
36 struct msgbuf {
37 long mtype; /* type of message */
38 char mtext[1]; /* message text */
41 /* buffer for msgctl calls IPC_INFO, MSG_INFO */
42 struct msginfo {
43 int msgpool;
44 int msgmap;
45 int msgmax;
46 int msgmnb;
47 int msgmni;
48 int msgssz;
49 int msgtql;
50 unsigned short msgseg;
53 #define MSGMNI 16 /* <= IPCMNI */ /* max # of msg queue identifiers */
54 #define MSGMAX 8192 /* <= INT_MAX */ /* max size of message (bytes) */
55 #define MSGMNB 16384 /* <= INT_MAX */ /* default max size of a message queue */
57 /* unused */
58 #define MSGPOOL (MSGMNI*MSGMNB/1024) /* size in kilobytes of message pool */
59 #define MSGTQL MSGMNB /* number of system message headers */
60 #define MSGMAP MSGMNB /* number of entries in message map */
61 #define MSGSSZ 16 /* message segment size */
62 #define __MSGSEG ((MSGPOOL*1024)/ MSGSSZ) /* max no. of segments */
63 #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
65 #ifdef __KERNEL__
67 /* one msg_msg structure for each message */
68 struct msg_msg {
69 struct list_head m_list;
70 long m_type;
71 int m_ts; /* message text size */
72 struct msg_msgseg* next;
73 void *security;
74 /* the actual message follows immediately */
77 /* one msq_queue structure for each present queue on the system */
78 struct msg_queue {
79 struct kern_ipc_perm q_perm;
80 int q_id;
81 time_t q_stime; /* last msgsnd time */
82 time_t q_rtime; /* last msgrcv time */
83 time_t q_ctime; /* last change time */
84 unsigned long q_cbytes; /* current number of bytes on queue */
85 unsigned long q_qnum; /* number of messages in queue */
86 unsigned long q_qbytes; /* max number of bytes on queue */
87 pid_t q_lspid; /* pid of last msgsnd */
88 pid_t q_lrpid; /* last receive pid */
90 struct list_head q_messages;
91 struct list_head q_receivers;
92 struct list_head q_senders;
95 #endif /* __KERNEL__ */
97 #endif /* _LINUX_MSG_H */