include/linux/msg.h

   1 #ifndef _LINUX_MSG_H
   2 #define _LINUX_MSG_H
   3
   4 #include <linux/list.h>
   5 #include <uapi/linux/msg.h>
   6
   7 /* one msg_msg structure for each message */
   8 struct msg_msg {
   9         struct list_head m_list;
  10         long  m_type;
  11         int m_ts;           /* message text size */
  12         struct msg_msgseg* next;
  13         void *security;
  14         /* the actual message follows immediately */
  15 };
  16
  17 /* one msq_queue structure for each present queue on the system */
  18 struct msg_queue {
  19         struct kern_ipc_perm q_perm;
  20         time_t q_stime;                 /* last msgsnd time */
  21         time_t q_rtime;                 /* last msgrcv time */
  22         time_t q_ctime;                 /* last change time */
  23         unsigned long q_cbytes;         /* current number of bytes on queue */
  24         unsigned long q_qnum;           /* number of messages in queue */
  25         unsigned long q_qbytes;         /* max number of bytes on queue */
  26         pid_t q_lspid;                  /* pid of last msgsnd */
  27         pid_t q_lrpid;                  /* last receive pid */
  28
  29         struct list_head q_messages;
  30         struct list_head q_receivers;
  31         struct list_head q_senders;
  32 };
  33
  34 /* Helper routines for sys_msgsnd and sys_msgrcv */
  35 extern long do_msgsnd(int msqid, long mtype, void __user *mtext,
  36                         size_t msgsz, int msgflg);
  37 extern long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
  38                       int msgflg,
  39                       long (*msg_fill)(void __user *, struct msg_msg *,
  40                                        size_t));
  41
  42 #endif /* _LINUX_MSG_H */