1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux 1
2 #ifndef _UAPI_LINUX_MSG_H
3 #define _UAPI_LINUX_MSG_H
4
5 #include <linux/ipc.h>
6
7 /* ipcs ctl commands */
8 #define MSG_STAT 11
9 #define MSG_INFO 12
10 #define MSG_STAT_ANY 13
11
12 /* msgrcv options */
13 #define MSG_NOERROR 010000 /* no error if
14 #define MSG_EXCEPT 020000 /* recv any ms
15 #define MSG_COPY 040000 /* copy (not r
16
17 /* Obsolete, used only for backwards compatibi
18 struct msqid_ds {
19 struct ipc_perm msg_perm;
20 struct msg *msg_first; /* fir
21 struct msg *msg_last; /* las
22 __kernel_old_time_t msg_stime; /* las
23 __kernel_old_time_t msg_rtime; /* las
24 __kernel_old_time_t msg_ctime; /* las
25 unsigned long msg_lcbytes; /* Reu
26 unsigned long msg_lqbytes; /* dit
27 unsigned short msg_cbytes; /* cur
28 unsigned short msg_qnum; /* num
29 unsigned short msg_qbytes; /* max
30 __kernel_ipc_pid_t msg_lspid; /* pid
31 __kernel_ipc_pid_t msg_lrpid; /* las
32 };
33
34 /* Include the definition of msqid64_ds */
35 #include <asm/msgbuf.h>
36
37 /* message buffer for msgsnd and msgrcv calls
38 struct msgbuf {
39 __kernel_long_t mtype; /* typ
40 char mtext[1]; /* mes
41 };
42
43 /* buffer for msgctl calls IPC_INFO, MSG_INFO
44 struct msginfo {
45 int msgpool;
46 int msgmap;
47 int msgmax;
48 int msgmnb;
49 int msgmni;
50 int msgssz;
51 int msgtql;
52 unsigned short msgseg;
53 };
54
55 /*
56 * MSGMNI, MSGMAX and MSGMNB are default value
57 * modified by sysctl.
58 *
59 * MSGMNI is the upper limit for the number of
60 * namespace.
61 * It has been chosen to be as large possible
62 * scenarios where userspace causes overflows
63 * operations of the form retrieve current lim
64 *
65 * MSGMNB is the default size of a new message
66 * decrease the size with msgctl(IPC_SET), roo
67 * (actually: CAP_SYS_RESOURCE) can both incre
68 * size. The optimal value is application depe
69 * 16384 is used because it was always used (s
70 *
71 * MAXMAX is the maximum size of an individual
72 * (per-namespace) limit that applies for all
73 * It's set to 1/2 of MSGMNB, to ensure that a
74 * the queue. This is also an arbitrary choice
75 */
76
77 #define MSGMNI 32000 /* <= IPCMNI */ /*
78 #define MSGMAX 8192 /* <= INT_MAX */ /* m
79 #define MSGMNB 16384 /* <= INT_MAX */ /* d
80
81 /* unused */
82 #define MSGPOOL (MSGMNI * MSGMNB / 1024) /* si
83 #define MSGTQL MSGMNB /* number of
84 #define MSGMAP MSGMNB /* number of
85 #define MSGSSZ 16 /* message s
86 #define __MSGSEG ((MSGPOOL * 1024) / MSGSSZ) /
87 #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG
88
89
90 #endif /* _UAPI_LINUX_MSG_H */
91
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