1 /* $FreeBSD: src/sys/sys/msg.h,v 1.10.2.1 2000/08/04 22:31:10 peter Exp $ */ 2 /* $DragonFly: src/sys/sys/msg.h,v 1.4 2003/08/27 02:03:22 dillon Exp $ */ 3 /* $NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $ */ 4 5 /* 6 * SVID compatible msg.h file 7 * 8 * Author: Daniel Boulet 9 * 10 * Copyright 1993 Daniel Boulet and RTMX Inc. 11 * 12 * This system call was implemented by Daniel Boulet under contract from RTMX. 13 * 14 * Redistribution and use in source forms, with and without modification, 15 * are permitted provided that this entire comment appears intact. 16 * 17 * Redistribution in binary form may occur without any restrictions. 18 * Obviously, it would be nice if you gave credit where credit is due 19 * but requiring it would be too onerous. 20 * 21 * This software is provided ``AS IS'' without any warranties of any kind. 22 */ 23 24 #ifndef _SYS_MSG_H_ 25 #define _SYS_MSG_H_ 26 27 #include <sys/ipc.h> 28 29 /* 30 * The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct 31 * are as defined by the SV API Intel 386 Processor Supplement. 32 */ 33 34 #define MSG_NOERROR 010000 /* don't complain about too long msgs */ 35 36 struct msg; 37 38 struct msqid_ds { 39 struct ipc_perm msg_perm; /* msg queue permission bits */ 40 struct msg *msg_first; /* first message in the queue */ 41 struct msg *msg_last; /* last message in the queue */ 42 u_long msg_cbytes; /* number of bytes in use on the queue */ 43 u_long msg_qnum; /* number of msgs in the queue */ 44 u_long msg_qbytes; /* max # of bytes on the queue */ 45 pid_t msg_lspid; /* pid of last msgsnd() */ 46 pid_t msg_lrpid; /* pid of last msgrcv() */ 47 time_t msg_stime; /* time of last msgsnd() */ 48 long msg_pad1; 49 time_t msg_rtime; /* time of last msgrcv() */ 50 long msg_pad2; 51 time_t msg_ctime; /* time of last msgctl() */ 52 long msg_pad3; 53 long msg_pad4[4]; 54 }; 55 56 /* 57 * Structure describing a message. The SVID doesn't suggest any 58 * particular name for this structure. There is a reference in the 59 * msgop man page that reads "The structure mymsg is an example of what 60 * this user defined buffer might look like, and includes the following 61 * members:". This sentence is followed by two lines equivalent 62 * to the mtype and mtext field declarations below. It isn't clear 63 * if "mymsg" refers to the naem of the structure type or the name of an 64 * instance of the structure... 65 */ 66 struct mymsg { 67 long mtype; /* message type (+ve integer) */ 68 char mtext[1]; /* message body */ 69 }; 70 71 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 72 73 /* 74 * Based on the configuration parameters described in an SVR2 (yes, two) 75 * config(1m) man page. 76 * 77 * Each message is broken up and stored in segments that are msgssz bytes 78 * long. For efficiency reasons, this should be a power of two. Also, 79 * it doesn't make sense if it is less than 8 or greater than about 256. 80 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of 81 * two between 8 and 1024 inclusive (and panic's if it isn't). 82 */ 83 struct msginfo { 84 int msgmax, /* max chars in a message */ 85 msgmni, /* max message queue identifiers */ 86 msgmnb, /* max chars in a queue */ 87 msgtql, /* max messages in system */ 88 msgssz, /* size of a message segment (see notes above) */ 89 msgseg; /* number of message segments */ 90 }; 91 #endif 92 93 #ifdef _KERNEL 94 extern struct msginfo msginfo; 95 #endif 96 97 #ifndef _KERNEL 98 99 #include <sys/cdefs.h> 100 101 __BEGIN_DECLS 102 int msgsys (int, ...); 103 int msgctl (int, int, struct msqid_ds *); 104 int msgget (key_t, int); 105 int msgsnd (int, void *, size_t, int); 106 int msgrcv (int, void*, size_t, long, int); 107 __END_DECLS 108 #endif 109 110 #endif /* !_SYS_MSG_H_ */ 111