Annotation of prex-old/usr/server/fs/devfs/devfs_vnops.c, Revision 1.1.1.1.2.1
1.1 nbrk 1: /*
2: * Copyright (c) 2005-2007, Kohsuke Ohtani
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the author nor the names of any co-contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
1.1.1.1.2.1! nbrk 30: /*
! 31: * devfs - device file system.
! 32: */
! 33:
1.1 nbrk 34: #include <prex/prex.h>
35: #include <sys/stat.h>
36: #include <sys/vnode.h>
37: #include <sys/file.h>
38: #include <sys/mount.h>
39: #include <sys/syslog.h>
40:
41: #include <ctype.h>
42: #include <unistd.h>
43: #include <errno.h>
44: #include <string.h>
45: #include <stdlib.h>
46: #include <limits.h>
47: #include <fcntl.h>
48:
49: #include "devfs.h"
50:
51:
52: #define devfs_mount ((vfsop_mount_t)vfs_nullop)
53: #define devfs_unmount ((vfsop_umount_t)vfs_nullop)
54: #define devfs_sync ((vfsop_sync_t)vfs_nullop)
55: #define devfs_vget ((vfsop_vget_t)vfs_nullop)
56: #define devfs_statfs ((vfsop_statfs_t)vfs_nullop)
57:
1.1.1.1.2.1! nbrk 58: static int devfs_open (vnode_t, int);
! 59: static int devfs_close (vnode_t, file_t);
! 60: static int devfs_read (vnode_t, file_t, void *, size_t, size_t *);
! 61: static int devfs_write (vnode_t, file_t, void *, size_t, size_t *);
1.1 nbrk 62: #define devfs_seek ((vnop_seek_t)vop_nullop)
1.1.1.1.2.1! nbrk 63: static int devfs_ioctl (vnode_t, file_t, u_long, void *);
1.1 nbrk 64: #define devfs_fsync ((vnop_fsync_t)vop_nullop)
65: static int devfs_readdir(vnode_t, file_t, struct dirent *);
1.1.1.1.2.1! nbrk 66: static int devfs_lookup (vnode_t, char *, vnode_t);
1.1 nbrk 67: #define devfs_create ((vnop_create_t)vop_einval)
68: #define devfs_remove ((vnop_remove_t)vop_einval)
69: #define devfs_rename ((vnop_rename_t)vop_einval)
70: #define devfs_mkdir ((vnop_mkdir_t)vop_einval)
71: #define devfs_rmdir ((vnop_rmdir_t)vop_einval)
72: #define devfs_getattr ((vnop_getattr_t)vop_nullop)
73: #define devfs_setattr ((vnop_setattr_t)vop_nullop)
74: #define devfs_inactive ((vnop_inactive_t)vop_nullop)
75: #define devfs_truncate ((vnop_truncate_t)vop_nullop)
76:
77: struct vnops devfs_vnops;
78:
79: /*
80: * File system operations
81: */
82: struct vfsops devfs_vfsops = {
83: devfs_mount, /* mount */
84: devfs_unmount, /* unmount */
85: devfs_sync, /* sync */
86: devfs_vget, /* vget */
87: devfs_statfs, /* statfs */
88: &devfs_vnops, /* vnops */
89: };
90:
91: /*
92: * vnode operations
93: */
94: struct vnops devfs_vnops = {
95: devfs_open, /* open */
96: devfs_close, /* close */
97: devfs_read, /* read */
98: devfs_write, /* write */
99: devfs_seek, /* seek */
100: devfs_ioctl, /* ioctl */
101: devfs_fsync, /* fsync */
102: devfs_readdir, /* readdir */
103: devfs_lookup, /* lookup */
104: devfs_create, /* create */
105: devfs_remove, /* remove */
106: devfs_rename, /* remame */
107: devfs_mkdir, /* mkdir */
108: devfs_rmdir, /* rmdir */
109: devfs_getattr, /* getattr */
110: devfs_setattr, /* setattr */
111: devfs_inactive, /* inactive */
112: devfs_truncate, /* truncate */
113: };
114:
115: static int
1.1.1.1.2.1! nbrk 116: devfs_open(vnode_t vp, int flags)
1.1 nbrk 117: {
118: char *path;
119: device_t dev;
120: int err;
121:
1.1.1.1.2.1! nbrk 122: DPRINTF(("devfs_open: path=%s\n", vp->v_path));
1.1 nbrk 123:
124: path = vp->v_path;
125: if (!strcmp(path, "/")) /* root ? */
126: return 0;
127:
128: if (*path == '/')
129: path++;
1.1.1.1.2.1! nbrk 130: err = device_open(path, flags & DO_RWMASK, &dev);
1.1 nbrk 131: if (err) {
1.1.1.1.2.1! nbrk 132: DPRINTF(("devfs_open: can not open device = %s error=%d\n",
! 133: path, err));
1.1 nbrk 134: return err;
135: }
136: vp->v_data = (void *)dev; /* Store private data */
137: return 0;
138: }
139:
140: static int
141: devfs_close(vnode_t vp, file_t fp)
142: {
143:
1.1.1.1.2.1! nbrk 144: DPRINTF(("devfs_close: fp=%x\n", fp));
1.1 nbrk 145:
146: if (!strcmp(vp->v_path, "/")) /* root ? */
147: return 0;
148:
149: return device_close((device_t)vp->v_data);
150: }
151:
152: static int
153: devfs_read(vnode_t vp, file_t fp, void *buf, size_t size, size_t *result)
154: {
155: int err;
156: size_t len;
157:
158: len = size;
159: err = device_read((device_t)vp->v_data, buf, &len, fp->f_offset);
160: if (!err)
161: *result = len;
162: return err;
163: }
164:
165: static int
166: devfs_write(vnode_t vp, file_t fp, void *buf, size_t size, size_t *result)
167: {
168: int err;
169: size_t len;
170:
171: len = size;
172: err = device_write((device_t)vp->v_data, buf, &len, fp->f_offset);
173: if (!err)
174: *result = len;
1.1.1.1.2.1! nbrk 175: DPRINTF(("devfs_write: err=%d len=%d\n", err, len));
1.1 nbrk 176: return err;
177: }
178:
179: static int
1.1.1.1.2.1! nbrk 180: devfs_ioctl(vnode_t vp, file_t fp, u_long cmd, void *arg)
1.1 nbrk 181: {
1.1.1.1.2.1! nbrk 182: DPRINTF(("devfs_ioctl\n"));
1.1 nbrk 183: return EINVAL;
184: }
185:
186: static int
187: devfs_lookup(vnode_t dvp, char *name, vnode_t vp)
188: {
189: struct info_device info;
190: int err, i;
191:
1.1.1.1.2.1! nbrk 192: DPRINTF(("devfs_lookup:%s\n", name));
1.1 nbrk 193:
194: if (*name == '\0')
195: return ENOENT;
196:
197: i = 0;
198: err = 0;
199: info.cookie = 0;
200: for (;;) {
201: err = sys_info(INFO_DEVICE, &info);
202: if (err)
203: return ENOENT;
204: if (!strncmp(info.name, name, MAXDEVNAME))
205: break;
206: i++;
207: }
208: vp->v_type = (info.flags & DF_CHR) ? VCHR : VBLK;
209: vp->v_mode = (mode_t)(S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP
210: | S_IROTH | S_IWOTH);
211: return 0;
212: }
213:
214: /*
215: * @vp: vnode of the directory.
216: */
217: static int
218: devfs_readdir(vnode_t vp, file_t fp, struct dirent *dir)
219: {
220: struct info_device info;
221: int err, i;
222:
1.1.1.1.2.1! nbrk 223: DPRINTF(("devfs_readdir offset=%d\n", fp->f_offset));
1.1 nbrk 224:
225: i = 0;
226: err = 0;
227: info.cookie = 0;
228: do {
229: err = sys_info(INFO_DEVICE, &info);
230: if (err)
231: return ENOENT;
232: } while (i++ != fp->f_offset);
233:
234: dir->d_type = 0;
235: if (info.flags & DF_CHR)
236: dir->d_type = DT_CHR;
237: else if (info.flags & DF_BLK)
238: dir->d_type = DT_BLK;
239: strcpy((char *)&dir->d_name, info.name);
240: dir->d_fileno = fp->f_offset;
241: dir->d_namlen = strlen(dir->d_name);
242:
1.1.1.1.2.1! nbrk 243: DPRINTF(("devfs_readdir: %s\n", dir->d_name));
1.1 nbrk 244: fp->f_offset++;
245: return 0;
246: }
247:
248: int
249: devfs_init(void)
250: {
251: return 0;
252: }
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