#include <sys/msg.h>

sys/msg.h Kernel.framework

$NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $

includes: sys/appleapiopts.h, sys/_types.h, sys/cdefs.h, sys/ipc.h, Kernel/sys/_types/_pid_t.h, Kernel/sys/_types/_time_t.h, sys/_types/_size_t.h, Kernel/sys/_types/_ssize_t.h, machine/types.h

10 macros · 6 structs · 6 typedefs · 5 variables

struct__msqid_ds_old

size 120, align 8

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[4]	msg_pad4	RESERVED: DO NOT USE

typedefuser_msgqnum_t

typedef user_ulong_t user_msgqnum_t

typedefuser64_msgqnum_t

typedef user64_ulong_t user64_msgqnum_t

typedefuser32_msgqnum_t

typedef user32_ulong_t user32_msgqnum_t

typedefuser_msglen_t

typedef user_ulong_t user_msglen_t

typedefuser64_msglen_t

typedef user64_ulong_t user64_msglen_t

typedefuser32_msglen_t

typedef user32_ulong_t user32_msglen_t

structuser_msqid_ds

kernel version

size 136, align 8

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[4]	msg_pad4

structuser64_msqid_ds

user64 version - this structure only has to be correct if compiled LP64, because the 32 bit kernel doesn't need it

size 116, align 1 · packed

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[4]	msg_pad4

structuser32_msqid_ds

size 92, align 4

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
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[4]	msg_pad4	RESERVED: DO NOT USE

structmsqid_kernel

Kernel wrapper for the user-level structure

size 144, align 8

struct user_msqid_ds	u
struct label *	label	MAC framework label

variablemsginfo

extern struct msginfo msginfo

macroMSGSSZ

#define MSGSSZ 8

Each segment must be 2^N long

macroMSGSEG

#define MSGSEG 2048

must be less than 32767

macroMSGMAX

#define MSGMAX (MSGSSZ*MSGSEG)

macroMSGMNB

#define MSGMNB 2048

max # of bytes in a queue

macroMSGMNI

#define MSGMNI 40

macroMSGTQL

#define MSGTQL 40

macroMSQID

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))

macroMSQID_IX

#define MSQID_IX(id) ((id) & 0xffff)

macroMSQID_SEQ

#define MSQID_SEQ(id) (((id) >> 16) & 0xffff)

structmsgmap

Stuff allocated in machdep.h

size 2, align 2

short

next segment in buffer

variablemsgpool

The following four externs really, really need to die; should be static

extern char *msgpool

MSGMAX byte long msg buffer pool

variablemsgmaps

extern struct msgmap *msgmaps

MSGSEG msgmap structures

variablemsghdrs

extern struct msg *msghdrs

MSGTQL msg headers

variablemsqids

extern struct msqid_kernel *msqids

MSGMNI user_msqid_ds struct's

macroMSG_LOCKED

#define MSG_LOCKED 01000

Is this msqid_ds locked?