forked from Imagelibrary/rtems
30d412469c
According to POSIX the lseek() function shall not, by itself, extend the size of a file. Remove the size field of rtems_libio_t. A file has only one size but may have multiple open file descriptors. Thus a file size field in the file descriptor may lead to inconsistencies. New default handlers rtems_filesystem_default_lseek_file() and rtems_filesystem_default_lseek_directory().
213 lines
3.9 KiB
C
213 lines
3.9 KiB
C
/*
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* IMFS Device Node Handlers
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*
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* This file contains the set of handlers used to map operations on
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* IMFS device nodes onto calls to the RTEMS Classic API IO Manager.
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*
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* COPYRIGHT (c) 1989-2008.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "imfs.h"
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#include <rtems/devfs.h>
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/*
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* device_open
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*
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* This handler maps an open() operation onto rtems_io_open().
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*/
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int device_open(
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rtems_libio_t *iop,
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const char *pathname,
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int oflag,
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mode_t mode
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)
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{
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rtems_libio_open_close_args_t args;
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rtems_status_code status;
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IMFS_jnode_t *the_jnode;
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the_jnode = iop->pathinfo.node_access;
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args.iop = iop;
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args.flags = iop->flags;
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args.mode = mode;
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status = rtems_io_open(
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the_jnode->info.device.major,
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the_jnode->info.device.minor,
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(void *) &args
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);
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return rtems_deviceio_errno( status );
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}
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/*
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* device_close
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*
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* This handler maps a close() operation onto rtems_io_close().
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*/
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int device_close(
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rtems_libio_t *iop
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)
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{
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rtems_libio_open_close_args_t args;
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rtems_status_code status;
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IMFS_jnode_t *the_jnode;
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the_jnode = iop->pathinfo.node_access;
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args.iop = iop;
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args.flags = 0;
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args.mode = 0;
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status = rtems_io_close(
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the_jnode->info.device.major,
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the_jnode->info.device.minor,
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(void *) &args
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);
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return rtems_deviceio_errno( status );
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}
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/*
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* device_read
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*
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* This handler maps a read() operation onto rtems_io_read().
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*/
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ssize_t device_read(
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rtems_libio_t *iop,
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void *buffer,
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size_t count
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)
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{
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rtems_libio_rw_args_t args;
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rtems_status_code status;
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IMFS_jnode_t *the_jnode;
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the_jnode = iop->pathinfo.node_access;
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args.iop = iop;
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args.offset = iop->offset;
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args.buffer = buffer;
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args.count = count;
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args.flags = iop->flags;
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args.bytes_moved = 0;
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status = rtems_io_read(
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the_jnode->info.device.major,
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the_jnode->info.device.minor,
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(void *) &args
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);
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if ( status )
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return rtems_deviceio_errno(status);
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return (ssize_t) args.bytes_moved;
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}
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/*
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* device_write
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*
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* This handler maps a write() operation onto rtems_io_write().
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*/
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ssize_t device_write(
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rtems_libio_t *iop,
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const void *buffer,
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size_t count
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)
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{
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rtems_libio_rw_args_t args;
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rtems_status_code status;
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IMFS_jnode_t *the_jnode;
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the_jnode = iop->pathinfo.node_access;
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args.iop = iop;
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args.offset = iop->offset;
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args.buffer = (void *) buffer;
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args.count = count;
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args.flags = iop->flags;
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args.bytes_moved = 0;
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status = rtems_io_write(
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the_jnode->info.device.major,
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the_jnode->info.device.minor,
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(void *) &args
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);
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if ( status )
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return rtems_deviceio_errno(status);
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return (ssize_t) args.bytes_moved;
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}
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/*
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* device_ioctl
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*
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* This handler maps an ioctl() operation onto rtems_io_ioctl().
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*/
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int device_ioctl(
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rtems_libio_t *iop,
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uint32_t command,
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void *buffer
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)
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{
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rtems_libio_ioctl_args_t args;
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rtems_status_code status;
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IMFS_jnode_t *the_jnode;
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args.iop = iop;
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args.command = command;
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args.buffer = buffer;
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the_jnode = iop->pathinfo.node_access;
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status = rtems_io_control(
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the_jnode->info.device.major,
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the_jnode->info.device.minor,
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(void *) &args
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);
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if ( status )
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return rtems_deviceio_errno(status);
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return args.ioctl_return;
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}
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/*
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* device_stat
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*
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* The IMFS_stat() is used.
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*/
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/*
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* device_rmnod
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*
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* The IMFS_rmnod() is used.
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*/
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int device_ftruncate(
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rtems_libio_t *iop,
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off_t length
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)
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{
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return 0;
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}
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