forked from Imagelibrary/threadx
Release 6.1.7
This commit is contained in:
Bo Chen
202
utility/rtos_compatibility_layers/posix/px_mq_open.c
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202
utility/rtos_compatibility_layers/posix/px_mq_open.c
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/**************************************************************************/
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/* */
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/* Copyright (c) Microsoft Corporation. All rights reserved. */
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/* */
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/* This software is licensed under the Microsoft Software License */
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/* Terms for Microsoft Azure RTOS. Full text of the license can be */
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/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
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/* and in the root directory of this software. */
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/* */
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/**************************************************************************/
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/**************************************************************************/
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/**************************************************************************/
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/** */
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/** POSIX wrapper for THREADX */
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/** */
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/** */
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/** */
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/**************************************************************************/
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/**************************************************************************/
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/* Include necessary system files. */
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#include "tx_api.h" /* Threadx API */
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#include "pthread.h" /* Posix API */
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#include "px_int.h" /* Posix helper functions */
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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* mq_open PORTABLE C */
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/* 6.x */
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/* AUTHOR */
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/* */
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/* William E. Lamie, Microsoft Corporation */
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/* */
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/* DESCRIPTION */
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/* */
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/* This routine establishes connection between a named message queue */
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/* and the calling a thread */
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/* */
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/* INPUT */
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/* */
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/* mqName name of the queue to open. */
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/* oflags O_RDONLY, O_WRONLY, O_RDWR, or O_CREAT, */
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/* O_EXCEL,O_NONBLOCK. */
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/* extra optional parameters. */
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/* */
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/* OUTPUT */
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/* */
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/* queue_des If successful */
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/* ERROR If fails */
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/* */
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/* CALLS */
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/* */
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/* posix_find_queue find queue of given name */
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/* posix_mq_create create a queue */
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/* posix_get_queue_des gets a queue-descriptor for Queue */
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/* */
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/* CALLED BY */
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/* */
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/* Application Code */
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/* */
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/* RELEASE HISTORY */
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/* */
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/* DATE NAME DESCRIPTION */
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/* */
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/* xx-xx-xxxx William E. Lamie Initial Version 6.x */
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/* */
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/**************************************************************************/
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mqd_t mq_open(const CHAR * mqName, ULONG oflags,...)
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{
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POSIX_MSG_QUEUE *posix_queue;
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struct mq_des *queue_des;
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struct mq_attr *q_attr;
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mode_t mode;
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va_list create_queue;
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ULONG len;
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ULONG temp1;
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len = strlen(mqName);
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if(len > PATH_MAX)
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{
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/* Return error. */
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posix_errno = ENAMETOOLONG;
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posix_set_pthread_errno(ENAMETOOLONG);
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/*. Return error. */
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return((struct mq_des *)ERROR);
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}
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switch(oflags & 0xFF00)
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{
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case O_CREAT:
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case (O_EXCL | O_CREAT):
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va_start(create_queue, oflags);
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mode = va_arg(create_queue, mode_t);
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mode = mode; /* just to keep the complier happy */
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q_attr = va_arg(create_queue, struct mq_attr *);
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va_end(create_queue);
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/* Check for valid messages and its size. */
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if(!q_attr || q_attr->mq_maxmsg > MQ_MAXMSG || q_attr->mq_msgsize > MQ_MSGSIZE)
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{
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/* return POSIX error.for invalid oflag. */
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posix_errno = EINVAL;
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posix_set_pthread_errno(EINVAL);
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/* return error. */
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return ((struct mq_des *)ERROR);
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}
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/* Check if name is exist. NULL if successful. */
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if(posix_queue = posix_find_queue(mqName))
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{
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if(posix_queue->unlink_flag == TX_TRUE)
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{
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/* return POSIX error. */
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posix_errno = ENOENT;
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posix_set_pthread_errno(ENOENT);
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/* return error. */
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return ((struct mq_des *)ERROR);
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}
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/* Set Posix error if name exist. */
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posix_errno = EEXIST;
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posix_set_pthread_errno(EEXIST);
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/* return error */
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return((struct mq_des *)ERROR);
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}
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/* If q_attr is NULL then the default attributes of the struct
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mq_attr are used */
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if(q_attr == NULL)
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{
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q_attr = &(posix_qattr_default);
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temp1 = q_attr->mq_maxmsg;
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temp1= temp1 ; /* Just to keep complier happy */
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}
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/* Create a queue which returns posix queue if successful and
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NULL if fails. */
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if(!(posix_queue = posix_mq_create(mqName, q_attr)))
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{
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/* posix_errno is filled up in mq_create. */
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return((struct mq_des *)ERROR);
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}
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/* open count incremented by one. */
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posix_queue->open_count += 1;
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break;
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case O_EXCL:
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/* Check if name is exist. NULL if successful. */
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if(!(posix_queue = posix_find_queue(mqName)))
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{
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/* return POSIX error. */
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posix_errno = EBADF;
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posix_set_pthread_errno(EBADF);
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/* return error. */
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return ((struct mq_des *)ERROR);
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}
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return(OK);
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case O_RDONLY:
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case O_WRONLY:
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case O_RDWR:
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case O_NONBLOCK:
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/* Check if name is exist. NULL if successful. */
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if(posix_queue = posix_find_queue(mqName))
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{
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if(posix_queue->unlink_flag == TX_TRUE)
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{
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/* return POSIX error. */
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posix_errno = ENOENT;
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posix_set_pthread_errno(ENOENT);
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/* return error. */
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return ((struct mq_des *)ERROR);
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}
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/* open count incremented by one. */
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posix_queue->open_count += 1;
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}
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break;
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default:
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/* return POSIX error.for invalid oflag. */
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posix_errno = EINVAL;
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posix_set_pthread_errno(EINVAL);
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/* return error. */
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return ((struct mq_des *)ERROR);
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}
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queue_des = posix_get_queue_des(posix_queue);
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/* Store the flags. */
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queue_des->f_flag = oflags;
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return(queue_des);
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}
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