Cider Isn't Darwin Emulation, Really
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/* * SVID compatible msg.h file * * Author: Daniel Boulet * * Copyright 1993 Daniel Boulet and RTMX Inc. * * This system call was implemented by Daniel Boulet under contract from RTMX. * * Redistribution and use in source forms, with and without modification, * are permitted provided that this entire comment appears intact. * * Redistribution in binary form may occur without any restrictions. * Obviously, it would be nice if you gave credit where credit is due * but requiring it would be too onerous. * * This software is provided ``AS IS'' without any warranties of any kind. *//* * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce * support for mandatory and extensible security protections. This notice * is included in support of clause 2.2 (b) of the Apple Public License, * Version 2.0. */
#ifndef _SYS_MSG_H_#define _SYS_MSG_H_
#include <sys/appleapiopts.h>
#include <sys/_types.h>#include <sys/cdefs.h>
/* * [XSI] All of the symbols from <sys/ipc.h> SHALL be defined when this * header is included */#include <sys/ipc.h>
/* * [XSI] The pid_t, time_t, key_t, size_t, and ssize_t types shall be * defined as described in <sys/types.h>. * * NOTE: The definition of the key_t type is implicit from the * inclusion of <sys/ipc.h> */#include <sys/_types/_pid_t.h>#include <sys/_types/_time_t.h>#include <sys/_types/_size_t.h>#include <sys/_types/_ssize_t.h>
/* [XSI] Used for the number of messages in the message queue */typedef unsigned long msgqnum_t;
/* [XSI] Used for the number of bytes allowed in a message queue */typedef unsigned long msglen_t;
/* * Possible values for the fifth parameter to msgrcv(), in addition to the * IPC_NOWAIT flag, which is permitted. */#define MSG_NOERROR 010000 /* [XSI] No error if big message */
/* * Technically, we should force all code references to the new structure * definition, not in just the standards conformance case, and leave the * legacy interface there for binary compatibility only. Currently, we * are only forcing this for programs requesting standards conformance. */#if __DARWIN_UNIX03 || defined(KERNEL)#pragma pack(4)/* * Structure used internally. * * Structure whose address is passed as the third parameter to msgctl() * when the second parameter is IPC_SET or IPC_STAT. In the case of the * IPC_SET command, only the msg_perm.{uid|gid|perm} and msg_qbytes are * honored. In the case of IPC_STAT, only the fields indicated as [XSI] * mandated fields are guaranteed to meaningful: DO NOT depend on the * contents of the other fields. * * NOTES: Reserved fields are not preserved across IPC_SET/IPC_STAT. */#if (defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE))struct msqid_ds#else#define msqid_ds __msqid_ds_newstruct __msqid_ds_new#endif{ struct __ipc_perm_new msg_perm; /* [XSI] msg queue permissions */ __int32_t msg_first; /* RESERVED: kernel use only */ __int32_t msg_last; /* RESERVED: kernel use only */ msglen_t msg_cbytes; /* # of bytes on the queue */ msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */ msglen_t msg_qbytes; /* [XSI] max bytes on the queue */ pid_t msg_lspid; /* [XSI] pid of last msgsnd() */ pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */ time_t msg_stime; /* [XSI] time of last msgsnd() */ __int32_t msg_pad1; /* RESERVED: DO NOT USE */ time_t msg_rtime; /* [XSI] time of last msgrcv() */ __int32_t msg_pad2; /* RESERVED: DO NOT USE */ time_t msg_ctime; /* [XSI] time of last msgctl() */ __int32_t msg_pad3; /* RESERVED: DO NOT USE */ __int32_t msg_pad4[4]; /* RESERVED: DO NOT USE */};#pragma pack()#else /* !__DARWIN_UNIX03 */#define msqid_ds __msqid_ds_old#endif /* !__DARWIN_UNIX03 */
#if !__DARWIN_UNIX03struct __msqid_ds_old { struct __ipc_perm_old msg_perm; /* [XSI] msg queue permissions */ __int32_t msg_first; /* RESERVED: kernel use only */ __int32_t msg_last; /* RESERVED: kernel use only */ msglen_t msg_cbytes; /* # of bytes on the queue */ msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */ msglen_t msg_qbytes; /* [XSI] max bytes on the queue */ pid_t msg_lspid; /* [XSI] pid of last msgsnd() */ pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */ time_t msg_stime; /* [XSI] time of last msgsnd() */ __int32_t msg_pad1; /* RESERVED: DO NOT USE */ time_t msg_rtime; /* [XSI] time of last msgrcv() */ __int32_t msg_pad2; /* RESERVED: DO NOT USE */ time_t msg_ctime; /* [XSI] time of last msgctl() */ __int32_t msg_pad3; /* RESERVED: DO NOT USE */ __int32_t msg_pad4[4]; /* RESERVED: DO NOT USE */};#endif /* !__DARWIN_UNIX03 */
#ifdef KERNEL#ifdef __APPLE_API_PRIVATE#include <machine/types.h>
#if __DARWIN_ALIGN_NATURAL#pragma options align=natural#endif
typedef user_ulong_t user_msgqnum_t;typedef user64_ulong_t user64_msgqnum_t;typedef user32_ulong_t user32_msgqnum_t;
typedef user_ulong_t user_msglen_t;typedef user64_ulong_t user64_msglen_t;typedef user32_ulong_t user32_msglen_t;
/* kernel version */struct user_msqid_ds { struct ipc_perm msg_perm; /* [XSI] msg queue permissions */ struct msg *msg_first; /* first message in the queue */ struct msg *msg_last; /* last message in the queue */ user_msglen_t msg_cbytes; /* # of bytes on the queue */ user_msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */ user_msglen_t msg_qbytes; /* [XSI] max bytes on the queue */ pid_t msg_lspid; /* [XSI] pid of last msgsnd() */ pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */ user_time_t msg_stime; /* [XSI] time of last msgsnd() */ __int32_t msg_pad1; /* RESERVED: DO NOT USE */ user_time_t msg_rtime; /* [XSI] time of last msgrcv() */ __int32_t msg_pad2; /* RESERVED: DO NOT USE */ user_time_t msg_ctime; /* [XSI] time of last msgctl() */ __int32_t msg_pad3; /* RESERVED: DO NOT USE */ __int32_t msg_pad4[4];};
/* * user64 version - this structure only has to be correct if * compiled LP64, because the 32 bit kernel doesn't need it */struct user64_msqid_ds { struct ipc_perm msg_perm; /* [XSI] msg queue permissions */ __int32_t msg_first; /* RESERVED: kernel use only */ __int32_t msg_last; /* RESERVED: kernel use only */ user64_msglen_t msg_cbytes; /* # of bytes on the queue */ user64_msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */ user64_msglen_t msg_qbytes; /* [XSI] max bytes on the queue */ pid_t msg_lspid; /* [XSI] pid of last msgsnd() */ pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */ user64_time_t msg_stime; /* [XSI] time of last msgsnd() */ __int32_t msg_pad1; /* RESERVED: DO NOT USE */ user64_time_t msg_rtime; /* [XSI] time of last msgrcv() */ __int32_t msg_pad2; /* RESERVED: DO NOT USE */ user64_time_t msg_ctime; /* [XSI] time of last msgctl() */ __int32_t msg_pad3; /* RESERVED: DO NOT USE */ __int32_t msg_pad4[4];} __attribute__((__packed__));
struct user32_msqid_ds{ struct __ipc_perm_new msg_perm; /* [XSI] msg queue permissions */ __int32_t msg_first; /* RESERVED: kernel use only */ __int32_t msg_last; /* RESERVED: kernel use only */ user32_msglen_t msg_cbytes; /* # of bytes on the queue */ user32_msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */ user32_msglen_t msg_qbytes; /* [XSI] max bytes on the queue */ pid_t msg_lspid; /* [XSI] pid of last msgsnd() */ pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */ user32_time_t msg_stime; /* [XSI] time of last msgsnd() */ __int32_t msg_pad1; /* RESERVED: DO NOT USE */ user32_time_t msg_rtime; /* [XSI] time of last msgrcv() */ __int32_t msg_pad2; /* RESERVED: DO NOT USE */ user32_time_t msg_ctime; /* [XSI] time of last msgctl() */ __int32_t msg_pad3; /* RESERVED: DO NOT USE */ __int32_t msg_pad4[4]; /* RESERVED: DO NOT USE */};
#if __DARWIN_ALIGN_NATURAL#pragma options align=reset#endif
struct label;
/* * Kernel wrapper for the user-level structure */struct msqid_kernel { struct user_msqid_ds u; struct label *label; /* MAC framework label */};
#endif /* __APPLE_API_PRIVATE */#endif /* KERNEL */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)#ifdef __APPLE_API_UNSTABLE/* XXX kernel only; protect with macro later */
struct msg { struct msg *msg_next; /* next msg in the chain */ long msg_type; /* type of this message */ /* >0 -> type of this message */ /* 0 -> free header */ unsigned short msg_ts; /* size of this message */ short msg_spot; /* location of msg start in buffer */ struct label *label; /* MAC label */};
/* * Example structure describing a message whose address is to be passed as * the second argument to the functions msgrcv() and msgsnd(). The only * actual hard requirement is that the first field be of type long, and * contain the message type. The user is encouraged to define their own * application specific structure; this definition is included solely for * backward compatability with existing source code. */struct mymsg { long mtype; /* message type (+ve integer) */ char mtext[1]; /* message body */};
/* * Based on the configuration parameters described in an SVR2 (yes, two) * config(1m) man page. * * Each message is broken up and stored in segments that are msgssz bytes * long. For efficiency reasons, this should be a power of two. Also, * it doesn't make sense if it is less than 8 or greater than about 256. * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of * two between 8 and 1024 inclusive (and panic's if it isn't). */struct msginfo { int msgmax, /* max chars in a message */ msgmni, /* max message queue identifiers */ msgmnb, /* max chars in a queue */ msgtql, /* max messages in system */ msgssz, /* size of a message segment (see notes above) */ msgseg; /* number of message segments */};#ifdef KERNELextern struct msginfo msginfo;
#ifndef MSGSSZ#define MSGSSZ 8 /* Each segment must be 2^N long */#endif#ifndef MSGSEG#define MSGSEG 2048 /* must be less than 32767 */#endif#define MSGMAX (MSGSSZ*MSGSEG)#ifndef MSGMNB#define MSGMNB 2048 /* max # of bytes in a queue */#endif#ifndef MSGMNI#define MSGMNI 40#endif#ifndef MSGTQL#define MSGTQL 40#endif
/* * macros to convert between msqid_ds's and msqid's. * (specific to this implementation) */#define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000))#define MSQID_IX(id) ((id) & 0xffff)#define MSQID_SEQ(id) (((id) >> 16) & 0xffff)
/* * The rest of this file is specific to this particular implementation. */
/* * Stuff allocated in machdep.h */struct msgmap { short next; /* next segment in buffer */ /* -1 -> available */ /* 0..(MSGSEG-1) -> index of next segment */};
/* The following four externs really, really need to die; should be static */extern char *msgpool; /* MSGMAX byte long msg buffer pool */extern struct msgmap *msgmaps; /* MSGSEG msgmap structures */extern struct msg *msghdrs; /* MSGTQL msg headers */extern struct msqid_kernel *msqids; /* MSGMNI user_msqid_ds struct's */
#define MSG_LOCKED 01000 /* Is this msqid_ds locked? */
#endif /* KERNEL */#endif /* __APPLE_API_UNSTABLE */#endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
#ifndef KERNEL
__BEGIN_DECLS#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)int msgsys(int, ...);#endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */int msgctl(int, int, struct msqid_ds *) __DARWIN_ALIAS(msgctl);int msgget(key_t, int);ssize_t msgrcv(int, void *, size_t, long, int) __DARWIN_ALIAS_C(msgrcv);int msgsnd(int, const void *, size_t, int) __DARWIN_ALIAS_C(msgsnd);__END_DECLS
#endif /* !KERNEL */
#endif /* !_SYS_MSG_H_ */