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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup IMFS
*
* @brief FIFO Support
*/
/*
* Author: Wei Shen <cquark@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/imfsimpl.h>
#include <sys/filio.h>
#define JNODE2PIPE(_jnode) ( ((IMFS_fifo_t *)(_jnode))->pipe )
#define LIBIO2PIPE(_iop) ( JNODE2PIPE((IMFS_jnode_t *)(_iop)->pathinfo.node_access) )
/* Set errno and return -1 if error, else return _err */
#define IMFS_FIFO_RETURN(_err) \
do { \
if (_err < 0) \
rtems_set_errno_and_return_minus_one(-_err); \
return _err; \
} while (0)
static int IMFS_fifo_open(
rtems_libio_t *iop,
const char *pathname,
int oflag,
mode_t mode
)
{
IMFS_jnode_t *jnode = iop->pathinfo.node_access;
int err = fifo_open(&JNODE2PIPE(jnode), iop);
IMFS_FIFO_RETURN(err);
}
static int IMFS_fifo_close(
rtems_libio_t *iop
)
{
int err = 0;
IMFS_jnode_t *jnode = iop->pathinfo.node_access;
pipe_release(&JNODE2PIPE(jnode), iop);
IMFS_FIFO_RETURN(err);
}
static ssize_t IMFS_fifo_read(
rtems_libio_t *iop,
void *buffer,
size_t count
)
{
IMFS_jnode_t *jnode = iop->pathinfo.node_access;
int err = pipe_read(JNODE2PIPE(jnode), buffer, count, iop);
if (err > 0)
IMFS_update_atime(jnode);
IMFS_FIFO_RETURN(err);
}
static ssize_t IMFS_fifo_write(
rtems_libio_t *iop,
const void *buffer,
size_t count
)
{
IMFS_jnode_t *jnode = iop->pathinfo.node_access;
int err = pipe_write(JNODE2PIPE(jnode), buffer, count, iop);
if (err > 0) {
IMFS_mtime_ctime_update(jnode);
}
IMFS_FIFO_RETURN(err);
}
static int IMFS_fifo_ioctl(
rtems_libio_t *iop,
ioctl_command_t command,
void *buffer
)
{
int err;
if (command == FIONBIO) {
if (buffer == NULL)
err = -EFAULT;
else {
if (*(int *)buffer)
rtems_libio_iop_flags_set( iop, LIBIO_FLAGS_NO_DELAY );
else
rtems_libio_iop_flags_clear( iop, LIBIO_FLAGS_NO_DELAY );
return 0;
}
}
else
err = pipe_ioctl(LIBIO2PIPE(iop), command, buffer, iop);
IMFS_FIFO_RETURN(err);
}
static const rtems_filesystem_file_handlers_r IMFS_fifo_handlers = {
.open_h = IMFS_fifo_open,
.close_h = IMFS_fifo_close,
.read_h = IMFS_fifo_read,
.write_h = IMFS_fifo_write,
.ioctl_h = IMFS_fifo_ioctl,
.lseek_h = rtems_filesystem_default_lseek,
.fstat_h = IMFS_stat,
.ftruncate_h = rtems_filesystem_default_ftruncate,
.fsync_h = rtems_filesystem_default_fsync_or_fdatasync,
.fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync,
.fcntl_h = rtems_filesystem_default_fcntl,
.kqfilter_h = rtems_filesystem_default_kqfilter,
.mmap_h = rtems_filesystem_default_mmap,
.poll_h = rtems_filesystem_default_poll,
.readv_h = rtems_filesystem_default_readv,
.writev_h = rtems_filesystem_default_writev
};
const IMFS_mknod_control IMFS_mknod_control_fifo = {
{
.handlers = &IMFS_fifo_handlers,
.node_initialize = IMFS_node_initialize_default,
.node_remove = IMFS_node_remove_default,
.node_destroy = IMFS_node_destroy_default
},
.node_size = sizeof( IMFS_fifo_t )
};
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