1*607ca46eSDavid Howells #ifndef _UAPI_LINUX_MSG_H 2*607ca46eSDavid Howells #define _UAPI_LINUX_MSG_H 3*607ca46eSDavid Howells 4*607ca46eSDavid Howells #include <linux/ipc.h> 5*607ca46eSDavid Howells 6*607ca46eSDavid Howells /* ipcs ctl commands */ 7*607ca46eSDavid Howells #define MSG_STAT 11 8*607ca46eSDavid Howells #define MSG_INFO 12 9*607ca46eSDavid Howells 10*607ca46eSDavid Howells /* msgrcv options */ 11*607ca46eSDavid Howells #define MSG_NOERROR 010000 /* no error if message is too big */ 12*607ca46eSDavid Howells #define MSG_EXCEPT 020000 /* recv any msg except of specified type.*/ 13*607ca46eSDavid Howells 14*607ca46eSDavid Howells /* Obsolete, used only for backwards compatibility and libc5 compiles */ 15*607ca46eSDavid Howells struct msqid_ds { 16*607ca46eSDavid Howells struct ipc_perm msg_perm; 17*607ca46eSDavid Howells struct msg *msg_first; /* first message on queue,unused */ 18*607ca46eSDavid Howells struct msg *msg_last; /* last message in queue,unused */ 19*607ca46eSDavid Howells __kernel_time_t msg_stime; /* last msgsnd time */ 20*607ca46eSDavid Howells __kernel_time_t msg_rtime; /* last msgrcv time */ 21*607ca46eSDavid Howells __kernel_time_t msg_ctime; /* last change time */ 22*607ca46eSDavid Howells unsigned long msg_lcbytes; /* Reuse junk fields for 32 bit */ 23*607ca46eSDavid Howells unsigned long msg_lqbytes; /* ditto */ 24*607ca46eSDavid Howells unsigned short msg_cbytes; /* current number of bytes on queue */ 25*607ca46eSDavid Howells unsigned short msg_qnum; /* number of messages in queue */ 26*607ca46eSDavid Howells unsigned short msg_qbytes; /* max number of bytes on queue */ 27*607ca46eSDavid Howells __kernel_ipc_pid_t msg_lspid; /* pid of last msgsnd */ 28*607ca46eSDavid Howells __kernel_ipc_pid_t msg_lrpid; /* last receive pid */ 29*607ca46eSDavid Howells }; 30*607ca46eSDavid Howells 31*607ca46eSDavid Howells /* Include the definition of msqid64_ds */ 32*607ca46eSDavid Howells #include <asm/msgbuf.h> 33*607ca46eSDavid Howells 34*607ca46eSDavid Howells /* message buffer for msgsnd and msgrcv calls */ 35*607ca46eSDavid Howells struct msgbuf { 36*607ca46eSDavid Howells long mtype; /* type of message */ 37*607ca46eSDavid Howells char mtext[1]; /* message text */ 38*607ca46eSDavid Howells }; 39*607ca46eSDavid Howells 40*607ca46eSDavid Howells /* buffer for msgctl calls IPC_INFO, MSG_INFO */ 41*607ca46eSDavid Howells struct msginfo { 42*607ca46eSDavid Howells int msgpool; 43*607ca46eSDavid Howells int msgmap; 44*607ca46eSDavid Howells int msgmax; 45*607ca46eSDavid Howells int msgmnb; 46*607ca46eSDavid Howells int msgmni; 47*607ca46eSDavid Howells int msgssz; 48*607ca46eSDavid Howells int msgtql; 49*607ca46eSDavid Howells unsigned short msgseg; 50*607ca46eSDavid Howells }; 51*607ca46eSDavid Howells 52*607ca46eSDavid Howells /* 53*607ca46eSDavid Howells * Scaling factor to compute msgmni: 54*607ca46eSDavid Howells * the memory dedicated to msg queues (msgmni * msgmnb) should occupy 55*607ca46eSDavid Howells * at most 1/MSG_MEM_SCALE of the lowmem (see the formula in ipc/msg.c): 56*607ca46eSDavid Howells * up to 8MB : msgmni = 16 (MSGMNI) 57*607ca46eSDavid Howells * 4 GB : msgmni = 8K 58*607ca46eSDavid Howells * more than 16 GB : msgmni = 32K (IPCMNI) 59*607ca46eSDavid Howells */ 60*607ca46eSDavid Howells #define MSG_MEM_SCALE 32 61*607ca46eSDavid Howells 62*607ca46eSDavid Howells #define MSGMNI 16 /* <= IPCMNI */ /* max # of msg queue identifiers */ 63*607ca46eSDavid Howells #define MSGMAX 8192 /* <= INT_MAX */ /* max size of message (bytes) */ 64*607ca46eSDavid Howells #define MSGMNB 16384 /* <= INT_MAX */ /* default max size of a message queue */ 65*607ca46eSDavid Howells 66*607ca46eSDavid Howells /* unused */ 67*607ca46eSDavid Howells #define MSGPOOL (MSGMNI * MSGMNB / 1024) /* size in kbytes of message pool */ 68*607ca46eSDavid Howells #define MSGTQL MSGMNB /* number of system message headers */ 69*607ca46eSDavid Howells #define MSGMAP MSGMNB /* number of entries in message map */ 70*607ca46eSDavid Howells #define MSGSSZ 16 /* message segment size */ 71*607ca46eSDavid Howells #define __MSGSEG ((MSGPOOL * 1024) / MSGSSZ) /* max no. of segments */ 72*607ca46eSDavid Howells #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff) 73*607ca46eSDavid Howells 74*607ca46eSDavid Howells 75*607ca46eSDavid Howells #endif /* _UAPI_LINUX_MSG_H */ 76