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  1. /*
  2.  * Copyright (c) 2007 Jakub Jermar
  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 libc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <vfs.h>
  36. #include <ipc/ipc.h>
  37. #include <ipc/services.h>
  38. #include <async.h>
  39. #include <atomic.h>
  40. #include <futex.h>
  41. #include <errno.h>
  42. #include <string.h>
  43. #include "../../srv/vfs/vfs.h"
  44.  
  45. int vfs_phone = -1;
  46. atomic_t vfs_phone_futex = FUTEX_INITIALIZER;
  47.  
  48. static int vfs_connect(void)
  49. {
  50.     if (vfs_phone < 0)
  51.         vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0);
  52.     return vfs_phone;
  53. }
  54.  
  55. int mount(const char *fs_name, const char *mp, const char *dev)
  56. {
  57.     int res;
  58.     ipcarg_t rc;
  59.     aid_t req;
  60.  
  61.     int dev_handle = 0; /* TODO */
  62.  
  63.     futex_down(&vfs_phone_futex);
  64.     async_serialize_start();
  65.     if (vfs_phone < 0) {
  66.         res = vfs_connect();
  67.         if (res < 0) {
  68.             async_serialize_end();
  69.             futex_up(&vfs_phone_futex);
  70.             return res;
  71.         }
  72.     }
  73.     req = async_send_1(vfs_phone, VFS_MOUNT, dev_handle, NULL);
  74.     rc = ipc_data_write_send(vfs_phone, (void *)fs_name, strlen(fs_name));
  75.     if (rc != EOK) {
  76.         async_wait_for(req, NULL);
  77.         async_serialize_end();
  78.         futex_up(&vfs_phone_futex);
  79.         return (int) rc;
  80.     }
  81.     rc = ipc_data_write_send(vfs_phone, (void *)mp, strlen(mp));
  82.     if (rc != EOK) {
  83.         async_wait_for(req, NULL);
  84.         async_serialize_end();
  85.         futex_up(&vfs_phone_futex);
  86.         return (int) rc;
  87.     }
  88.     async_wait_for(req, &rc);
  89.     async_serialize_end();
  90.     futex_up(&vfs_phone_futex);
  91.     return (int) rc;
  92. }
  93.  
  94.  
  95. int open(const char *name, int oflag, ...)
  96. {
  97.     int res;
  98.     ipcarg_t rc;
  99.     ipc_call_t answer;
  100.     aid_t req;
  101.    
  102.     futex_down(&vfs_phone_futex);
  103.     async_serialize_start();
  104.     if (vfs_phone < 0) {
  105.         res = vfs_connect();
  106.         if (res < 0) {
  107.             async_serialize_end();
  108.             futex_up(&vfs_phone_futex);
  109.             return res;
  110.         }
  111.     }
  112.     req = async_send_2(vfs_phone, VFS_OPEN, oflag, 0, &answer);
  113.     rc = ipc_data_write_send(vfs_phone, name, strlen(name));
  114.     if (rc != EOK) {
  115.         async_wait_for(req, NULL);
  116.         async_serialize_end();
  117.         futex_up(&vfs_phone_futex);
  118.         return (int) rc;
  119.     }
  120.     async_wait_for(req, &rc);
  121.     async_serialize_end();
  122.     futex_up(&vfs_phone_futex);
  123.     return (int) IPC_GET_ARG1(answer);
  124. }
  125.  
  126. ssize_t read(int fildes, void *buf, size_t nbyte)
  127. {
  128.     int res;
  129.     ipcarg_t rc;
  130.     ipc_call_t answer;
  131.     aid_t req;
  132.  
  133.     futex_down(&vfs_phone_futex);
  134.     async_serialize_start();
  135.     if (vfs_phone < 0) {
  136.         res = vfs_connect();
  137.         if (res < 0) {
  138.             async_serialize_end();
  139.             futex_up(&vfs_phone_futex);
  140.             return res;
  141.         }
  142.     }
  143.     req = async_send_1(vfs_phone, VFS_READ, 0, &answer);
  144.     if (ipc_data_read_send(vfs_phone, buf, sizeof(buf)) != EOK) {
  145.         async_wait_for(req, NULL);
  146.         async_serialize_end();
  147.         futex_up(&vfs_phone_futex);
  148.         return (ssize_t) rc;
  149.     }
  150.     async_wait_for(req, &rc);
  151.     async_serialize_end();
  152.     futex_up(&vfs_phone_futex);
  153.     return (ssize_t) IPC_GET_ARG1(answer);
  154. }
  155.  
  156. /** @}
  157.  */
  158.