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/*
* imfs_fifo.c: FIFO support for IMFS
*
* Author: Wei Shen <cquark@gmail.com>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "imfs.h"
#define JNODE2PIPE(_jnode) ( (_jnode)->info.fifo.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);
iop->flags &= ~LIBIO_FLAGS_OPEN;
IMFS_check_node_remove(jnode);
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,
uint32_t command,
void *buffer
)
{
int err;
if (command == FIONBIO) {
if (buffer == NULL)
err = -EFAULT;
else {
if (*(int *)buffer)
iop->flags |= LIBIO_FLAGS_NO_DELAY;
else
iop->flags &= ~LIBIO_FLAGS_NO_DELAY;
return 0;
}
}
else
err = pipe_ioctl(LIBIO2PIPE(iop), command, buffer, iop);
IMFS_FIFO_RETURN(err);
}
static off_t IMFS_fifo_lseek(
rtems_libio_t *iop,
off_t offset,
int whence
)
{
off_t err = pipe_lseek(LIBIO2PIPE(iop), offset, whence, iop);
IMFS_FIFO_RETURN(err);
}
/*
* Handler table for IMFS FIFO nodes
*/
const rtems_filesystem_file_handlers_r IMFS_fifo_handlers = {
IMFS_fifo_open,
IMFS_fifo_close,
IMFS_fifo_read,
IMFS_fifo_write,
IMFS_fifo_ioctl,
IMFS_fifo_lseek,
IMFS_stat,
rtems_filesystem_default_ftruncate,
rtems_filesystem_default_fsync,
rtems_filesystem_default_fdatasync,
rtems_filesystem_default_fcntl
};
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