scoutos / prex-0.9.0 / usr / server / fs / devfs / devfs_vnops.c @ 03e9c04a
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/*
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* Copyright (c) 2005-2007, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* devfs - device file system.
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*/
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#include <sys/prex.h> |
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#include <sys/device.h> |
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#include <sys/stat.h> |
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#include <sys/vnode.h> |
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#include <sys/file.h> |
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#include <sys/mount.h> |
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#include <sys/syslog.h> |
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#include <ctype.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <string.h> |
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#include <stdlib.h> |
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#include <limits.h> |
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#include <fcntl.h> |
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#include "devfs.h" |
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#define devfs_mount ((vfsop_mount_t)vfs_nullop)
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#define devfs_unmount ((vfsop_umount_t)vfs_nullop)
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#define devfs_sync ((vfsop_sync_t)vfs_nullop)
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#define devfs_vget ((vfsop_vget_t)vfs_nullop)
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#define devfs_statfs ((vfsop_statfs_t)vfs_nullop)
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static int devfs_open (vnode_t, int); |
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static int devfs_close (vnode_t, file_t); |
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static int devfs_read (vnode_t, file_t, void *, size_t, size_t *); |
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static int devfs_write (vnode_t, file_t, void *, size_t, size_t *); |
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#define devfs_seek ((vnop_seek_t)vop_nullop)
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static int devfs_ioctl (vnode_t, file_t, u_long, void *); |
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#define devfs_fsync ((vnop_fsync_t)vop_nullop)
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static int devfs_readdir(vnode_t, file_t, struct dirent *); |
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static int devfs_lookup (vnode_t, char *, vnode_t); |
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#define devfs_create ((vnop_create_t)vop_einval)
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#define devfs_remove ((vnop_remove_t)vop_einval)
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#define devfs_rename ((vnop_rename_t)vop_einval)
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#define devfs_mkdir ((vnop_mkdir_t)vop_einval)
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#define devfs_rmdir ((vnop_rmdir_t)vop_einval)
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#define devfs_getattr ((vnop_getattr_t)vop_nullop)
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#define devfs_setattr ((vnop_setattr_t)vop_nullop)
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#define devfs_inactive ((vnop_inactive_t)vop_nullop)
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#define devfs_truncate ((vnop_truncate_t)vop_nullop)
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/*
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* vnode operations
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*/
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struct vnops devfs_vnops = {
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devfs_open, /* open */
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devfs_close, /* close */
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devfs_read, /* read */
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devfs_write, /* write */
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devfs_seek, /* seek */
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devfs_ioctl, /* ioctl */
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devfs_fsync, /* fsync */
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devfs_readdir, /* readdir */
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devfs_lookup, /* lookup */
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devfs_create, /* create */
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devfs_remove, /* remove */
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devfs_rename, /* remame */
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devfs_mkdir, /* mkdir */
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devfs_rmdir, /* rmdir */
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devfs_getattr, /* getattr */
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devfs_setattr, /* setattr */
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devfs_inactive, /* inactive */
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devfs_truncate, /* truncate */
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}; |
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/*
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* File system operations
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*/
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struct vfsops devfs_vfsops = {
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devfs_mount, /* mount */
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devfs_unmount, /* unmount */
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devfs_sync, /* sync */
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devfs_vget, /* vget */
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devfs_statfs, /* statfs */
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&devfs_vnops, /* vnops */
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}; |
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static int |
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devfs_open(vnode_t vp, int flags)
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{ |
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char *path;
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device_t dev; |
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int error;
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DPRINTF(("devfs_open: path=%s\n", vp->v_path));
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path = vp->v_path; |
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if (!strcmp(path, "/")) /* root ? */ |
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return 0; |
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if (vp->v_flags & VPROTDEV) {
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DPRINTF(("devfs_open: failed to open protected device.\n"));
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return EPERM;
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} |
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if (*path == '/') |
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path++; |
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error = device_open(path, flags & DO_RWMASK, &dev); |
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if (error) {
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DPRINTF(("devfs_open: can not open device = %s error=%d\n",
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path, error)); |
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return error;
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} |
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vp->v_data = (void *)dev; /* Store private data */ |
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return 0; |
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} |
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static int |
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devfs_close(vnode_t vp, file_t fp) |
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{ |
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DPRINTF(("devfs_close: fp=%x\n", fp));
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if (!strcmp(vp->v_path, "/")) /* root ? */ |
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return 0; |
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return device_close((device_t)vp->v_data);
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} |
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static int |
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devfs_read(vnode_t vp, file_t fp, void *buf, size_t size, size_t *result)
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{ |
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int error;
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size_t len; |
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len = size; |
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error = device_read((device_t)vp->v_data, buf, &len, fp->f_offset); |
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if (!error)
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*result = len; |
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return error;
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} |
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static int |
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devfs_write(vnode_t vp, file_t fp, void *buf, size_t size, size_t *result)
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{ |
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int error;
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size_t len; |
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len = size; |
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error = device_write((device_t)vp->v_data, buf, &len, fp->f_offset); |
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if (!error)
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*result = len; |
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DPRINTF(("devfs_write: error=%d len=%d\n", error, len));
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return error;
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} |
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static int |
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devfs_ioctl(vnode_t vp, file_t fp, u_long cmd, void *arg)
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{ |
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int error;
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error = device_ioctl((device_t)vp->v_data, cmd, arg); |
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DPRINTF(("devfs_ioctl: cmd=%x\n", cmd));
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return error;
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} |
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static int |
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devfs_lookup(vnode_t dvp, char *name, vnode_t vp)
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{ |
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struct devinfo info;
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int error, i;
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DPRINTF(("devfs_lookup:%s\n", name));
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if (*name == '\0') |
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return ENOENT;
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i = 0;
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error = 0;
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info.cookie = 0;
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for (;;) {
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error = sys_info(INFO_DEVICE, &info); |
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if (error)
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return ENOENT;
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if (!strncmp(info.name, name, MAXDEVNAME))
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break;
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i++; |
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} |
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vp->v_type = (info.flags & D_CHR) ? VCHR : VBLK; |
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if (info.flags & D_TTY)
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vp->v_flags |= VISTTY; |
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if (info.flags & D_PROT)
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vp->v_flags |= VPROTDEV; |
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else
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vp->v_mode = (mode_t)(S_IRUSR | S_IWUSR); |
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return 0; |
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} |
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/*
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* @vp: vnode of the directory.
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*/
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static int |
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devfs_readdir(vnode_t vp, file_t fp, struct dirent *dir)
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{ |
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struct devinfo info;
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int error, i;
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DPRINTF(("devfs_readdir offset=%d\n", fp->f_offset));
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i = 0;
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error = 0;
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info.cookie = 0;
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do {
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error = sys_info(INFO_DEVICE, &info); |
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if (error)
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return ENOENT;
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} while (i++ != fp->f_offset);
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dir->d_type = 0;
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if (info.flags & D_CHR)
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dir->d_type = DT_CHR; |
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else if (info.flags & D_BLK) |
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dir->d_type = DT_BLK; |
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strlcpy((char *)&dir->d_name, info.name, sizeof(dir->d_name)); |
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dir->d_fileno = (uint32_t)fp->f_offset; |
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dir->d_namlen = (uint16_t)strlen(dir->d_name); |
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DPRINTF(("devfs_readdir: %s\n", dir->d_name));
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fp->f_offset++; |
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return 0; |
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} |
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int
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devfs_init(void)
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{ |
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return 0; |
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} |