File: [local] / prex-old / usr / server / fs / devfs / devfs_vnops.c (download)
Revision 1.1.1.1.2.1, Wed Aug 13 16:12:44 2008 UTC (16 years ago) by nbrk
Branch: PREX_0_8_BASE
Changes since 1.1.1.1: +22 -18 lines
Prex 0.8.0 has been released. Branch off from vanilla PREX_0_7_BASE preparing
the tree for backporting my changes.
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/*
* Copyright (c) 2005-2007, Kohsuke Ohtani
* All rights reserved.
*
* 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.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
/*
* devfs - device file system.
*/
#include <prex/prex.h>
#include <sys/stat.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/mount.h>
#include <sys/syslog.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <fcntl.h>
#include "devfs.h"
#define devfs_mount ((vfsop_mount_t)vfs_nullop)
#define devfs_unmount ((vfsop_umount_t)vfs_nullop)
#define devfs_sync ((vfsop_sync_t)vfs_nullop)
#define devfs_vget ((vfsop_vget_t)vfs_nullop)
#define devfs_statfs ((vfsop_statfs_t)vfs_nullop)
static int devfs_open (vnode_t, int);
static int devfs_close (vnode_t, file_t);
static int devfs_read (vnode_t, file_t, void *, size_t, size_t *);
static int devfs_write (vnode_t, file_t, void *, size_t, size_t *);
#define devfs_seek ((vnop_seek_t)vop_nullop)
static int devfs_ioctl (vnode_t, file_t, u_long, void *);
#define devfs_fsync ((vnop_fsync_t)vop_nullop)
static int devfs_readdir(vnode_t, file_t, struct dirent *);
static int devfs_lookup (vnode_t, char *, vnode_t);
#define devfs_create ((vnop_create_t)vop_einval)
#define devfs_remove ((vnop_remove_t)vop_einval)
#define devfs_rename ((vnop_rename_t)vop_einval)
#define devfs_mkdir ((vnop_mkdir_t)vop_einval)
#define devfs_rmdir ((vnop_rmdir_t)vop_einval)
#define devfs_getattr ((vnop_getattr_t)vop_nullop)
#define devfs_setattr ((vnop_setattr_t)vop_nullop)
#define devfs_inactive ((vnop_inactive_t)vop_nullop)
#define devfs_truncate ((vnop_truncate_t)vop_nullop)
struct vnops devfs_vnops;
/*
* File system operations
*/
struct vfsops devfs_vfsops = {
devfs_mount, /* mount */
devfs_unmount, /* unmount */
devfs_sync, /* sync */
devfs_vget, /* vget */
devfs_statfs, /* statfs */
&devfs_vnops, /* vnops */
};
/*
* vnode operations
*/
struct vnops devfs_vnops = {
devfs_open, /* open */
devfs_close, /* close */
devfs_read, /* read */
devfs_write, /* write */
devfs_seek, /* seek */
devfs_ioctl, /* ioctl */
devfs_fsync, /* fsync */
devfs_readdir, /* readdir */
devfs_lookup, /* lookup */
devfs_create, /* create */
devfs_remove, /* remove */
devfs_rename, /* remame */
devfs_mkdir, /* mkdir */
devfs_rmdir, /* rmdir */
devfs_getattr, /* getattr */
devfs_setattr, /* setattr */
devfs_inactive, /* inactive */
devfs_truncate, /* truncate */
};
static int
devfs_open(vnode_t vp, int flags)
{
char *path;
device_t dev;
int err;
DPRINTF(("devfs_open: path=%s\n", vp->v_path));
path = vp->v_path;
if (!strcmp(path, "/")) /* root ? */
return 0;
if (*path == '/')
path++;
err = device_open(path, flags & DO_RWMASK, &dev);
if (err) {
DPRINTF(("devfs_open: can not open device = %s error=%d\n",
path, err));
return err;
}
vp->v_data = (void *)dev; /* Store private data */
return 0;
}
static int
devfs_close(vnode_t vp, file_t fp)
{
DPRINTF(("devfs_close: fp=%x\n", fp));
if (!strcmp(vp->v_path, "/")) /* root ? */
return 0;
return device_close((device_t)vp->v_data);
}
static int
devfs_read(vnode_t vp, file_t fp, void *buf, size_t size, size_t *result)
{
int err;
size_t len;
len = size;
err = device_read((device_t)vp->v_data, buf, &len, fp->f_offset);
if (!err)
*result = len;
return err;
}
static int
devfs_write(vnode_t vp, file_t fp, void *buf, size_t size, size_t *result)
{
int err;
size_t len;
len = size;
err = device_write((device_t)vp->v_data, buf, &len, fp->f_offset);
if (!err)
*result = len;
DPRINTF(("devfs_write: err=%d len=%d\n", err, len));
return err;
}
static int
devfs_ioctl(vnode_t vp, file_t fp, u_long cmd, void *arg)
{
DPRINTF(("devfs_ioctl\n"));
return EINVAL;
}
static int
devfs_lookup(vnode_t dvp, char *name, vnode_t vp)
{
struct info_device info;
int err, i;
DPRINTF(("devfs_lookup:%s\n", name));
if (*name == '\0')
return ENOENT;
i = 0;
err = 0;
info.cookie = 0;
for (;;) {
err = sys_info(INFO_DEVICE, &info);
if (err)
return ENOENT;
if (!strncmp(info.name, name, MAXDEVNAME))
break;
i++;
}
vp->v_type = (info.flags & DF_CHR) ? VCHR : VBLK;
vp->v_mode = (mode_t)(S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP
| S_IROTH | S_IWOTH);
return 0;
}
/*
* @vp: vnode of the directory.
*/
static int
devfs_readdir(vnode_t vp, file_t fp, struct dirent *dir)
{
struct info_device info;
int err, i;
DPRINTF(("devfs_readdir offset=%d\n", fp->f_offset));
i = 0;
err = 0;
info.cookie = 0;
do {
err = sys_info(INFO_DEVICE, &info);
if (err)
return ENOENT;
} while (i++ != fp->f_offset);
dir->d_type = 0;
if (info.flags & DF_CHR)
dir->d_type = DT_CHR;
else if (info.flags & DF_BLK)
dir->d_type = DT_BLK;
strcpy((char *)&dir->d_name, info.name);
dir->d_fileno = fp->f_offset;
dir->d_namlen = strlen(dir->d_name);
DPRINTF(("devfs_readdir: %s\n", dir->d_name));
fp->f_offset++;
return 0;
}
int
devfs_init(void)
{
return 0;
}