source: mainline/uspace/srv/fs/devfs/devfs.c@ 7a2be00

/*
 * Copyright (c) 2009 Martin Decky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

/** @addtogroup fs
 * @{
 */

/**
 * @file devfs.c
 * @brief Devices file system.
 *
 * Every device registered to device mapper is represented as a file in this
 * file system.
 */

#include <stdio.h>
#include <ipc/services.h>
#include <ns.h>
#include <async.h>
#include <errno.h>
#include <task.h>
#include <libfs.h>
#include "devfs.h"
#include "devfs_ops.h"

#define NAME  "devfs"

static vfs_info_t devfs_vfs_info = {
        .name = NAME,
        .concurrent_read_write = false,
        .write_retains_size = false,
};

fs_reg_t devfs_reg;

static void devfs_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        if (iid)
                async_answer_0(iid, EOK);
        
        while (true) {
                ipc_call_t call;
                ipc_callid_t callid = async_get_call(&call);
                
                if (!IPC_GET_IMETHOD(call))
                        return;
                
                switch (IPC_GET_IMETHOD(call)) {
                case VFS_OUT_MOUNTED:
                        devfs_mounted(callid, &call);
                        break;
                case VFS_OUT_MOUNT:
                        devfs_mount(callid, &call);
                        break;
                case VFS_OUT_UNMOUNTED:
                        devfs_unmounted(callid, &call);
                        break;
                case VFS_OUT_UNMOUNT:
                        devfs_unmount(callid, &call);
                        break;
                case VFS_OUT_LOOKUP:
                        devfs_lookup(callid, &call);
                        break;
                case VFS_OUT_OPEN_NODE:
                        devfs_open_node(callid, &call);
                        break;
                case VFS_OUT_STAT:
                        devfs_stat(callid, &call);
                        break;
                case VFS_OUT_READ:
                        devfs_read(callid, &call);
                        break;
                case VFS_OUT_WRITE:
                        devfs_write(callid, &call);
                        break;
                case VFS_OUT_TRUNCATE:
                        devfs_truncate(callid, &call);
                        break;
                case VFS_OUT_CLOSE:
                        devfs_close(callid, &call);
                        break;
                case VFS_OUT_SYNC:
                        devfs_sync(callid, &call);
                        break;
                case VFS_OUT_DESTROY:
                        devfs_destroy(callid, &call);
                        break;
                default:
                        async_answer_0(callid, ENOTSUP);
                        break;
                }
        }
}

int main(int argc, char *argv[])
{
        printf("%s: HelenOS Device Filesystem\n", NAME);
        
        if (!devfs_init()) {
                printf("%s: failed to initialize devfs\n", NAME);
                return -1;
        }
        
        async_sess_t *vfs_sess = service_connect_blocking(EXCHANGE_SERIALIZE,
            SERVICE_VFS, 0, 0);
        if (!vfs_sess) {
                printf("%s: Unable to connect to VFS\n", NAME);
                return -1;
        }
        
        int rc = fs_register(vfs_sess, &devfs_reg, &devfs_vfs_info,
            devfs_connection);
        if (rc != EOK) {
                printf("%s: Failed to register file system (%d)\n", NAME, rc);
                return rc;
        }
        
        printf("%s: Accepting connections\n", NAME);
        task_retval(0);
        async_manager();
        
        /* Not reached */
        return 0;
}

/**
 * @}
 */