d2912cb15b
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/drivers/acorn/scsi/msgqueue.h
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*
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* Copyright (C) 1997 Russell King
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*
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* message queue handling
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*/
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#ifndef MSGQUEUE_H
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#define MSGQUEUE_H
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struct message {
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char msg[8];
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int length;
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int fifo;
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};
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struct msgqueue_entry {
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struct message msg;
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struct msgqueue_entry *next;
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};
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#define NR_MESSAGES 4
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typedef struct {
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struct msgqueue_entry *qe;
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struct msgqueue_entry *free;
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struct msgqueue_entry entries[NR_MESSAGES];
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} MsgQueue_t;
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/*
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* Function: void msgqueue_initialise(MsgQueue_t *msgq)
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* Purpose : initialise a message queue
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* Params : msgq - queue to initialise
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*/
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extern void msgqueue_initialise(MsgQueue_t *msgq);
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/*
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* Function: void msgqueue_free(MsgQueue_t *msgq)
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* Purpose : free a queue
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* Params : msgq - queue to free
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*/
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extern void msgqueue_free(MsgQueue_t *msgq);
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/*
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* Function: int msgqueue_msglength(MsgQueue_t *msgq)
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* Purpose : calculate the total length of all messages on the message queue
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* Params : msgq - queue to examine
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* Returns : number of bytes of messages in queue
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*/
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extern int msgqueue_msglength(MsgQueue_t *msgq);
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/*
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* Function: struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno)
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* Purpose : return a message & its length
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* Params : msgq - queue to obtain message from
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* : msgno - message number
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* Returns : pointer to message string, or NULL
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*/
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extern struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno);
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/*
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* Function: int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...)
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* Purpose : add a message onto a message queue
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* Params : msgq - queue to add message on
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* length - length of message
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* ... - message bytes
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* Returns : != 0 if successful
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*/
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extern int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...);
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/*
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* Function: void msgqueue_flush(MsgQueue_t *msgq)
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* Purpose : flush all messages from message queue
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* Params : msgq - queue to flush
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*/
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extern void msgqueue_flush(MsgQueue_t *msgq);
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#endif
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