1 /* $FreeBSD$ */ 2 /* $NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $ */ 3 4 /*- 5 * SVID compatible msg.h file 6 * 7 * Author: Daniel Boulet 8 * 9 * Copyright 1993 Daniel Boulet and RTMX Inc. 10 * 11 * This system call was implemented by Daniel Boulet under contract from RTMX. 12 * 13 * Redistribution and use in source forms, with and without modification, 14 * are permitted provided that this entire comment appears intact. 15 * 16 * Redistribution in binary form may occur without any restrictions. 17 * Obviously, it would be nice if you gave credit where credit is due 18 * but requiring it would be too onerous. 19 * 20 * This software is provided ``AS IS'' without any warranties of any kind. 21 */ 22 23 #ifndef _SYS_MSG_H_ 24 #define _SYS_MSG_H_ 25 26 #include <sys/cdefs.h> 27 #include <sys/_types.h> 28 #ifdef _WANT_SYSVMSG_INTERNALS 29 #define _WANT_SYSVIPC_INTERNALS 30 #endif 31 #include <sys/ipc.h> 32 33 /* 34 * The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct 35 * are as defined by the SV API Intel 386 Processor Supplement. 36 */ 37 38 #define MSG_NOERROR 010000 /* don't complain about too long msgs */ 39 40 typedef unsigned long msglen_t; 41 typedef unsigned long msgqnum_t; 42 43 #ifndef _PID_T_DECLARED 44 typedef __pid_t pid_t; 45 #define _PID_T_DECLARED 46 #endif 47 48 #ifndef _SIZE_T_DECLARED 49 typedef __size_t size_t; 50 #define _SIZE_T_DECLARED 51 #endif 52 53 #ifndef _SSIZE_T_DECLARED 54 typedef __ssize_t ssize_t; 55 #define _SSIZE_T_DECLARED 56 #endif 57 58 #ifndef _TIME_T_DECLARED 59 typedef __time_t time_t; 60 #define _TIME_T_DECLARED 61 #endif 62 63 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 64 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 65 struct msqid_ds_old { 66 struct ipc_perm_old msg_perm; /* msg queue permission bits */ 67 struct msg *__msg_first; /* first message in the queue */ 68 struct msg *__msg_last; /* last message in the queue */ 69 msglen_t msg_cbytes; /* number of bytes in use on the queue */ 70 msgqnum_t msg_qnum; /* number of msgs in the queue */ 71 msglen_t msg_qbytes; /* max # of bytes on the queue */ 72 pid_t msg_lspid; /* pid of last msgsnd() */ 73 pid_t msg_lrpid; /* pid of last msgrcv() */ 74 time_t msg_stime; /* time of last msgsnd() */ 75 long msg_pad1; 76 time_t msg_rtime; /* time of last msgrcv() */ 77 long msg_pad2; 78 time_t msg_ctime; /* time of last msgctl() */ 79 long msg_pad3; 80 long msg_pad4[4]; 81 }; 82 #endif 83 84 /* 85 * XXX there seems to be no prefix reserved for this header, so the name 86 * "msg" in "struct msg" and the names of all of the nonstandard members 87 * are namespace pollution. 88 */ 89 90 struct msqid_ds { 91 struct ipc_perm msg_perm; /* msg queue permission bits */ 92 struct msg *__msg_first; /* first message in the queue */ 93 struct msg *__msg_last; /* last message in the queue */ 94 msglen_t msg_cbytes; /* number of bytes in use on the queue */ 95 msgqnum_t msg_qnum; /* number of msgs in the queue */ 96 msglen_t msg_qbytes; /* max # of bytes on the queue */ 97 pid_t msg_lspid; /* pid of last msgsnd() */ 98 pid_t msg_lrpid; /* pid of last msgrcv() */ 99 time_t msg_stime; /* time of last msgsnd() */ 100 time_t msg_rtime; /* time of last msgrcv() */ 101 time_t msg_ctime; /* time of last msgctl() */ 102 }; 103 104 #ifdef _KERNEL 105 struct msg { 106 struct msg *msg_next; /* next msg in the chain */ 107 long msg_type; /* type of this message */ 108 /* >0 -> type of this message */ 109 /* 0 -> free header */ 110 u_short msg_ts; /* size of this message */ 111 short msg_spot; /* location of start of msg in buffer */ 112 struct label *label; /* MAC Framework label */ 113 }; 114 #endif 115 116 #if defined(_KERNEL) || defined(_WANT_SYSVMSG_INTERNALS) 117 /* 118 * Based on the configuration parameters described in an SVR2 (yes, two) 119 * config(1m) man page. 120 * 121 * Each message is broken up and stored in segments that are msgssz bytes 122 * long. For efficiency reasons, this should be a power of two. Also, 123 * it doesn't make sense if it is less than 8 or greater than about 256. 124 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of 125 * two between 8 and 1024 inclusive (and panic's if it isn't). 126 */ 127 struct msginfo { 128 int msgmax; /* max chars in a message */ 129 int msgmni; /* max message queue identifiers */ 130 int msgmnb; /* max chars in a queue */ 131 int msgtql; /* max messages in system */ 132 int msgssz; /* size of a message segment (see note) */ 133 int msgseg; /* number of message segments */ 134 }; 135 136 /* 137 * Kernel wrapper for the user-level structure. 138 */ 139 struct msqid_kernel { 140 /* 141 * Data structure exposed to user space. 142 */ 143 struct msqid_ds u; 144 145 /* 146 * Kernel-private components of the message queue. 147 */ 148 struct label *label; /* MAC label */ 149 struct ucred *cred; /* creator's credentials */ 150 }; 151 #endif 152 153 #ifdef _KERNEL 154 extern struct msginfo msginfo; 155 156 #else /* _KERNEL */ 157 158 __BEGIN_DECLS 159 int msgctl(int, int, struct msqid_ds *); 160 int msgget(key_t, int); 161 ssize_t msgrcv(int, void *, size_t, long, int); 162 int msgsnd(int, const void *, size_t, int); 163 #if __BSD_VISIBLE 164 int msgsys(int, ...); 165 #endif 166 __END_DECLS 167 #endif /* !_KERNEL */ 168 169 #endif /* !_SYS_MSG_H_ */ 170