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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 <unistd.h>
  37. #include <fcntl.h>
  38. #include <ipc/ipc.h>
  39. #include <ipc/services.h>
  40. #include <async.h>
  41. #include <atomic.h>
  42. #include <futex.h>
  43. #include <errno.h>
  44. #include <string.h>
  45. #include "../../srv/vfs/vfs.h"
  46.  
  47. int vfs_phone = -1;
  48. atomic_t vfs_phone_futex = FUTEX_INITIALIZER;
  49.  
  50. static int vfs_connect(void)
  51. {
  52.     if (vfs_phone < 0)
  53.         vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0);
  54.     return vfs_phone;
  55. }
  56.  
  57. int mount(const char *fs_name, const char *mp, const char *dev)
  58. {
  59.     int res;
  60.     ipcarg_t rc;
  61.     aid_t req;
  62.  
  63.     int dev_handle = 0; /* TODO */
  64.  
  65.     futex_down(&vfs_phone_futex);
  66.     async_serialize_start();
  67.     if (vfs_phone < 0) {
  68.         res = vfs_connect();
  69.         if (res < 0) {
  70.             async_serialize_end();
  71.             futex_up(&vfs_phone_futex);
  72.             return res;
  73.         }
  74.     }
  75.     req = async_send_1(vfs_phone, VFS_MOUNT, dev_handle, NULL);
  76.     rc = ipc_data_write_start(vfs_phone, (void *)fs_name, strlen(fs_name));
  77.     if (rc != EOK) {
  78.         async_wait_for(req, NULL);
  79.         async_serialize_end();
  80.         futex_up(&vfs_phone_futex);
  81.         return (int) rc;
  82.     }
  83.     rc = ipc_data_write_start(vfs_phone, (void *)mp, strlen(mp));
  84.     if (rc != EOK) {
  85.         async_wait_for(req, NULL);
  86.         async_serialize_end();
  87.         futex_up(&vfs_phone_futex);
  88.         return (int) rc;
  89.     }
  90.     async_wait_for(req, &rc);
  91.     async_serialize_end();
  92.     futex_up(&vfs_phone_futex);
  93.     return (int) rc;
  94. }
  95.  
  96.  
  97. int open(const char *name, int oflag, ...)
  98. {
  99.     int res;
  100.     ipcarg_t rc;
  101.     ipc_call_t answer;
  102.     aid_t req;
  103.    
  104.     futex_down(&vfs_phone_futex);
  105.     async_serialize_start();
  106.     if (vfs_phone < 0) {
  107.         res = vfs_connect();
  108.         if (res < 0) {
  109.             async_serialize_end();
  110.             futex_up(&vfs_phone_futex);
  111.             return res;
  112.         }
  113.     }
  114.     req = async_send_2(vfs_phone, VFS_OPEN, oflag, 0, &answer);
  115.     rc = ipc_data_write_start(vfs_phone, name, strlen(name));
  116.     if (rc != EOK) {
  117.         async_wait_for(req, NULL);
  118.         async_serialize_end();
  119.         futex_up(&vfs_phone_futex);
  120.         return (int) rc;
  121.     }
  122.     async_wait_for(req, &rc);
  123.     async_serialize_end();
  124.     futex_up(&vfs_phone_futex);
  125.     return (int) IPC_GET_ARG1(answer);
  126. }
  127.  
  128. ssize_t read(int fildes, void *buf, size_t nbyte)
  129. {
  130.     int res;
  131.     ipcarg_t rc;
  132.     ipc_call_t answer;
  133.     aid_t req;
  134.  
  135.     futex_down(&vfs_phone_futex);
  136.     async_serialize_start();
  137.     if (vfs_phone < 0) {
  138.         res = vfs_connect();
  139.         if (res < 0) {
  140.             async_serialize_end();
  141.             futex_up(&vfs_phone_futex);
  142.             return res;
  143.         }
  144.     }
  145.     req = async_send_1(vfs_phone, VFS_READ, fildes, &answer);
  146.     if (ipc_data_read_start(vfs_phone, (void *)buf, nbyte) != EOK) {
  147.         async_wait_for(req, NULL);
  148.         async_serialize_end();
  149.         futex_up(&vfs_phone_futex);
  150.         return (ssize_t) rc;
  151.     }
  152.     async_wait_for(req, &rc);
  153.     async_serialize_end();
  154.     futex_up(&vfs_phone_futex);
  155.     return (ssize_t) IPC_GET_ARG1(answer);
  156. }
  157.  
  158. ssize_t write(int fildes, const void *buf, size_t nbyte)
  159. {
  160.     int res;
  161.     ipcarg_t rc;
  162.     ipc_call_t answer;
  163.     aid_t req;
  164.  
  165.     futex_down(&vfs_phone_futex);
  166.     async_serialize_start();
  167.     if (vfs_phone < 0) {
  168.         res = vfs_connect();
  169.         if (res < 0) {
  170.             async_serialize_end();
  171.             futex_up(&vfs_phone_futex);
  172.             return res;
  173.         }
  174.     }
  175.     req = async_send_1(vfs_phone, VFS_WRITE, fildes, &answer);
  176.     if (ipc_data_write_start(vfs_phone, (void *)buf, nbyte) != EOK) {
  177.         async_wait_for(req, NULL);
  178.         async_serialize_end();
  179.         futex_up(&vfs_phone_futex);
  180.         return (ssize_t) rc;
  181.     }
  182.     async_wait_for(req, &rc);
  183.     async_serialize_end();
  184.     futex_up(&vfs_phone_futex);
  185.     return (ssize_t) IPC_GET_ARG1(answer);
  186. }
  187. /** @}
  188.  */
  189.