source: mainline/uspace/srv/fs/devfs/devfs.c@ 1601f3c

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 1601f3c was a095d20, checked in by Martin Decky <martin@…>, 17 years ago

add simple devfs filesystem and mount it as /dev
add generic NULL device "null"
  • Property mode set to 100644
File size: 3.2 KB
Line 
1/*
2 * Copyright (c) 2009 Martin Decky
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 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup fs
30 * @{
31 */
32
33/**
34 * @file devfs.c
35 * @brief Devices file system.
36 *
37 * Every device registered to device mapper is represented as a file in this
38 * file system.
39 */
40
41#include <stdio.h>
42#include <ipc/ipc.h>
43#include <ipc/services.h>
44#include <async.h>
45#include <errno.h>
46#include <libfs.h>
47#include "devfs.h"
48#include "devfs_ops.h"
49
50#define NAME "devfs"
51
52static vfs_info_t devfs_vfs_info = {
53 .name = "devfs",
54};
55
56fs_reg_t devfs_reg;
57
58static void devfs_connection(ipc_callid_t iid, ipc_call_t *icall)
59{
60 if (iid)
61 ipc_answer_0(iid, EOK);
62
63 while (true) {
64 ipc_call_t call;
65 ipc_callid_t callid = async_get_call(&call);
66
67 switch (IPC_GET_METHOD(call)) {
68 case VFS_MOUNTED:
69 devfs_mounted(callid, &call);
70 break;
71 case VFS_MOUNT:
72 devfs_mount(callid, &call);
73 break;
74 case VFS_LOOKUP:
75 devfs_lookup(callid, &call);
76 break;
77 case VFS_READ:
78 devfs_read(callid, &call);
79 break;
80 case VFS_WRITE:
81 devfs_write(callid, &call);
82 break;
83 case VFS_TRUNCATE:
84 devfs_truncate(callid, &call);
85 break;
86 case VFS_DESTROY:
87 devfs_destroy(callid, &call);
88 break;
89 default:
90 ipc_answer_0(callid, ENOTSUP);
91 break;
92 }
93 }
94}
95
96int main(int argc, char *argv[])
97{
98 printf(NAME ": HelenOS Device Filesystem\n");
99
100 if (!devfs_init()) {
101 printf(NAME ": failed to initialize devfs\n");
102 return -1;
103 }
104
105 int vfs_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VFS, 0, 0);
106 if (vfs_phone < EOK) {
107 printf(NAME ": Unable to connect to VFS\n");
108 return -1;
109 }
110
111 int rc = fs_register(vfs_phone, &devfs_reg, &devfs_vfs_info,
112 devfs_connection);
113 if (rc != EOK) {
114 printf(NAME ": Failed to register file system (%d)\n", rc);
115 return rc;
116 }
117
118 printf(NAME ": Accepting connections\n");
119 async_manager();
120
121 /* Not reached */
122 return 0;
123}
124
125/**
126 * @}
127 */
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