posix/src/aio_read.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIX_AIO
0007  *
0008  * @brief Asynchronous read operation.
0009  */
0010
0011 /*
0012  *  Copyright 2010, Alin Rus <alin.codejunkie@gmail.com>
0013  *  Copyright 2024, Alessandro Nardin <ale.daluch@gmail.com>
0014  *
0015  *  COPYRIGHT (c) 1989-2011.
0016  *  On-Line Applications Research Corporation (OAR).
0017  *
0018  * Redistribution and use in source and binary forms, with or without
0019  * modification, are permitted provided that the following conditions
0020  * are met:
0021  * 1. Redistributions of source code must retain the above copyright
0022  *    notice, this list of conditions and the following disclaimer.
0023  * 2. Redistributions in binary form must reproduce the above copyright
0024  *    notice, this list of conditions and the following disclaimer in the
0025  *    documentation and/or other materials provided with the distribution.
0026  *
0027  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0028  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0029  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0030  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0031  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0032  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0033  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0034  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0035  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0036  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0037  * POSSIBILITY OF SUCH DAMAGE.
0038  */
0039
0040 #ifdef HAVE_CONFIG_H
0041 #include "config.h"
0042 #endif
0043
0044 #include <aio.h>
0045 #include <errno.h>
0046 #include <fcntl.h>
0047 #include <rtems/posix/aio_misc.h>
0048 #include <rtems/seterr.h>
0049 #include <stdlib.h>
0050 #include <limits.h>
0051
0052 int aio_read( struct aiocb *aiocbp )
0053 {
0054   rtems_aio_request *req;
0055
0056   if ( 1 + atomic_load( &aio_request_queue.queued_requests ) > RTEMS_AIO_MAX ) {
0057     rtems_set_errno_and_return_minus_one( EAGAIN );
0058   }
0059
0060   req = init_read_req( aiocbp );
0061
0062   if ( req != NULL ) {
0063     return rtems_aio_enqueue( req );
0064   } else {
0065     return -1;
0066   }
0067 }
0068