Enrico Fraccaroli
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/// MentOS, The Mentoring Operating system project
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/// @file msg.h
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/// @brief Definition of structure for managing message queues.
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/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#pragma once
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#include "sys/types.h"
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#include "stddef.h"
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#include "time.h"
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#include "ipc.h"
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/// Type for storing the number of messages in a message queue.
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typedef unsigned int msgqnum_t;
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/// Type for storing the number of bytes in a message queue.
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typedef unsigned int msglen_t;
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/// @brief Buffer to use with the message queue IPC.
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struct msgbuf {
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/// Type of the message.
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long mtype;
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/// Text of the message.
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char mtext[1];
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};
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/// @brief Message queue data structure.
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struct msqid_ds {
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/// Ownership and permissions.
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struct ipc_perm msg_perm;
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/// Time of last msgsnd(2).
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time_t msg_stime;
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/// Time of last msgrcv(2).
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time_t msg_rtime;
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/// Time of creation or last modification by msgctl().
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time_t msg_ctime;
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/// Number of bytes in queue.
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unsigned long msg_cbytes;
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/// Number of messages in queue.
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msgqnum_t msg_qnum;
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/// Maximum number of bytes in queue.
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msglen_t msg_qbytes;
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/// PID of last msgsnd(2).
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pid_t msg_lspid;
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/// PID of last msgrcv(2).
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pid_t msg_lrpid;
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};
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#ifdef __KERNEL__
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long sys_msgget(key_t key, int msgflg);
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long sys_msgsnd(int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg);
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long sys_msgrcv(int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp, int msgflg);
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long sys_msgctl(int msqid, int cmd, struct msqid_ds *buf);
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#else
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long msgget(key_t key, int msgflg);
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long msgsnd(int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg);
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long msgrcv(int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp, int msgflg);
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long msgctl(int msqid, int cmd, struct msqid_ds *buf);
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#endif |