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1 #ifndef _LINUX_MSG_H |
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2 #define _LINUX_MSG_H |
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3 |
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4 #include <linux/ipc.h> |
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5 |
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6 /* ipcs ctl commands */ |
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7 #define MSG_STAT 11 |
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8 #define MSG_INFO 12 |
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9 |
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10 /* msgrcv options */ |
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11 #define MSG_NOERROR 010000 /* no error if message is too big */ |
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12 #define MSG_EXCEPT 020000 /* recv any msg except of specified type.*/ |
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13 |
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14 /* Obsolete, used only for backwards compatibility and libc5 compiles */ |
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15 struct msqid_ds { |
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16 struct ipc_perm msg_perm; |
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17 struct msg *msg_first; /* first message on queue,unused */ |
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18 struct msg *msg_last; /* last message in queue,unused */ |
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19 __kernel_time_t msg_stime; /* last msgsnd time */ |
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20 __kernel_time_t msg_rtime; /* last msgrcv time */ |
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21 __kernel_time_t msg_ctime; /* last change time */ |
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22 unsigned long msg_lcbytes; /* Reuse junk fields for 32 bit */ |
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23 unsigned long msg_lqbytes; /* ditto */ |
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24 unsigned short msg_cbytes; /* current number of bytes on queue */ |
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25 unsigned short msg_qnum; /* number of messages in queue */ |
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26 unsigned short msg_qbytes; /* max number of bytes on queue */ |
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27 __kernel_ipc_pid_t msg_lspid; /* pid of last msgsnd */ |
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28 __kernel_ipc_pid_t msg_lrpid; /* last receive pid */ |
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29 }; |
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30 |
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31 /* Include the definition of msqid64_ds */ |
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32 #include <asm/msgbuf.h> |
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33 |
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34 /* message buffer for msgsnd and msgrcv calls */ |
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35 struct msgbuf { |
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36 long mtype; /* type of message */ |
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37 char mtext[1]; /* message text */ |
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38 }; |
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39 |
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40 /* buffer for msgctl calls IPC_INFO, MSG_INFO */ |
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41 struct msginfo { |
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42 int msgpool; |
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43 int msgmap; |
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44 int msgmax; |
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45 int msgmnb; |
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46 int msgmni; |
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47 int msgssz; |
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48 int msgtql; |
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49 unsigned short msgseg; |
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50 }; |
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51 |
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52 /* |
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53 * Scaling factor to compute msgmni: |
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54 * the memory dedicated to msg queues (msgmni * msgmnb) should occupy |
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55 * at most 1/MSG_MEM_SCALE of the lowmem (see the formula in ipc/msg.c): |
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56 * up to 8MB : msgmni = 16 (MSGMNI) |
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57 * 4 GB : msgmni = 8K |
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58 * more than 16 GB : msgmni = 32K (IPCMNI) |
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59 */ |
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60 #define MSG_MEM_SCALE 32 |
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61 |
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62 #define MSGMNI 16 /* <= IPCMNI */ /* max # of msg queue identifiers */ |
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63 #define MSGMAX 8192 /* <= INT_MAX */ /* max size of message (bytes) */ |
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64 #define MSGMNB 16384 /* <= INT_MAX */ /* default max size of a message queue */ |
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65 |
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66 /* unused */ |
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67 #define MSGPOOL (MSGMNI * MSGMNB / 1024) /* size in kbytes of message pool */ |
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68 #define MSGTQL MSGMNB /* number of system message headers */ |
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69 #define MSGMAP MSGMNB /* number of entries in message map */ |
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70 #define MSGSSZ 16 /* message segment size */ |
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71 #define __MSGSEG ((MSGPOOL * 1024) / MSGSSZ) /* max no. of segments */ |
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72 #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff) |
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73 |
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74 #ifdef __KERNEL__ |
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75 #include <linux/list.h> |
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76 |
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77 /* one msg_msg structure for each message */ |
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78 struct msg_msg { |
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79 struct list_head m_list; |
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80 long m_type; |
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81 int m_ts; /* message text size */ |
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82 struct msg_msgseg* next; |
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83 void *security; |
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84 /* the actual message follows immediately */ |
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85 }; |
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86 |
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87 /* one msq_queue structure for each present queue on the system */ |
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88 struct msg_queue { |
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89 struct kern_ipc_perm q_perm; |
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90 time_t q_stime; /* last msgsnd time */ |
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91 time_t q_rtime; /* last msgrcv time */ |
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92 time_t q_ctime; /* last change time */ |
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93 unsigned long q_cbytes; /* current number of bytes on queue */ |
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94 unsigned long q_qnum; /* number of messages in queue */ |
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95 unsigned long q_qbytes; /* max number of bytes on queue */ |
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96 pid_t q_lspid; /* pid of last msgsnd */ |
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97 pid_t q_lrpid; /* last receive pid */ |
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98 |
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99 struct list_head q_messages; |
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100 struct list_head q_receivers; |
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101 struct list_head q_senders; |
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102 }; |
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103 |
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104 /* Helper routines for sys_msgsnd and sys_msgrcv */ |
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105 extern long do_msgsnd(int msqid, long mtype, void __user *mtext, |
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106 size_t msgsz, int msgflg); |
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107 extern long do_msgrcv(int msqid, long *pmtype, void __user *mtext, |
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108 size_t msgsz, long msgtyp, int msgflg); |
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109 |
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110 #endif /* __KERNEL__ */ |
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111 |
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112 #endif /* _LINUX_MSG_H */ |