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  1. /*
  2.  * Copyright (c) 2008 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 <stdlib.h>
  37. #include <unistd.h>
  38. #include <dirent.h>
  39. #include <fcntl.h>
  40. #include <ipc/ipc.h>
  41. #include <ipc/services.h>
  42. #include <async.h>
  43. #include <atomic.h>
  44. #include <futex.h>
  45. #include <errno.h>
  46. #include <string.h>
  47. #include "../../srv/vfs/vfs.h"
  48.  
  49. int vfs_phone = -1;
  50. atomic_t vfs_phone_futex = FUTEX_INITIALIZER;
  51.  
  52. static int vfs_connect(void)
  53. {
  54.     if (vfs_phone < 0)
  55.         vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0);
  56.     return vfs_phone;
  57. }
  58.  
  59. int mount(const char *fs_name, const char *mp, const char *dev)
  60. {
  61.     int res;
  62.     ipcarg_t rc;
  63.     aid_t req;
  64.  
  65.     int dev_handle = 0; /* TODO */
  66.  
  67.     futex_down(&vfs_phone_futex);
  68.     async_serialize_start();
  69.     if (vfs_phone < 0) {
  70.         res = vfs_connect();
  71.         if (res < 0) {
  72.             async_serialize_end();
  73.             futex_up(&vfs_phone_futex);
  74.             return res;
  75.         }
  76.     }
  77.     req = async_send_1(vfs_phone, VFS_MOUNT, dev_handle, NULL);
  78.     rc = ipc_data_write_start(vfs_phone, (void *)fs_name, strlen(fs_name));
  79.     if (rc != EOK) {
  80.         async_wait_for(req, NULL);
  81.         async_serialize_end();
  82.         futex_up(&vfs_phone_futex);
  83.         return (int) rc;
  84.     }
  85.     rc = ipc_data_write_start(vfs_phone, (void *)mp, strlen(mp));
  86.     if (rc != EOK) {
  87.         async_wait_for(req, NULL);
  88.         async_serialize_end();
  89.         futex_up(&vfs_phone_futex);
  90.         return (int) rc;
  91.     }
  92.     async_wait_for(req, &rc);
  93.     async_serialize_end();
  94.     futex_up(&vfs_phone_futex);
  95.     return (int) rc;
  96. }
  97.  
  98.  
  99. int open(const char *path, int oflag, ...)
  100. {
  101.     int res;
  102.     ipcarg_t rc;
  103.     ipc_call_t answer;
  104.     aid_t req;
  105.    
  106.     futex_down(&vfs_phone_futex);
  107.     async_serialize_start();
  108.     if (vfs_phone < 0) {
  109.         res = vfs_connect();
  110.         if (res < 0) {
  111.             async_serialize_end();
  112.             futex_up(&vfs_phone_futex);
  113.             return res;
  114.         }
  115.     }
  116.     req = async_send_2(vfs_phone, VFS_OPEN, oflag, 0, &answer);
  117.     rc = ipc_data_write_start(vfs_phone, path, strlen(path));
  118.     if (rc != EOK) {
  119.         async_wait_for(req, NULL);
  120.         async_serialize_end();
  121.         futex_up(&vfs_phone_futex);
  122.         return (int) rc;
  123.     }
  124.     async_wait_for(req, &rc);
  125.     async_serialize_end();
  126.     futex_up(&vfs_phone_futex);
  127.     return (int) IPC_GET_ARG1(answer);
  128. }
  129.  
  130. ssize_t read(int fildes, void *buf, size_t nbyte)
  131. {
  132.     int res;
  133.     ipcarg_t rc;
  134.     ipc_call_t answer;
  135.     aid_t req;
  136.  
  137.     futex_down(&vfs_phone_futex);
  138.     async_serialize_start();
  139.     if (vfs_phone < 0) {
  140.         res = vfs_connect();
  141.         if (res < 0) {
  142.             async_serialize_end();
  143.             futex_up(&vfs_phone_futex);
  144.             return res;
  145.         }
  146.     }
  147.     req = async_send_1(vfs_phone, VFS_READ, fildes, &answer);
  148.     if (ipc_data_read_start(vfs_phone, (void *)buf, nbyte) != EOK) {
  149.         async_wait_for(req, NULL);
  150.         async_serialize_end();
  151.         futex_up(&vfs_phone_futex);
  152.         return (ssize_t) rc;
  153.     }
  154.     async_wait_for(req, &rc);
  155.     async_serialize_end();
  156.     futex_up(&vfs_phone_futex);
  157.     return (ssize_t) IPC_GET_ARG1(answer);
  158. }
  159.  
  160. ssize_t write(int fildes, const void *buf, size_t nbyte)
  161. {
  162.     int res;
  163.     ipcarg_t rc;
  164.     ipc_call_t answer;
  165.     aid_t req;
  166.  
  167.     futex_down(&vfs_phone_futex);
  168.     async_serialize_start();
  169.     if (vfs_phone < 0) {
  170.         res = vfs_connect();
  171.         if (res < 0) {
  172.             async_serialize_end();
  173.             futex_up(&vfs_phone_futex);
  174.             return res;
  175.         }
  176.     }
  177.     req = async_send_1(vfs_phone, VFS_WRITE, fildes, &answer);
  178.     if (ipc_data_write_start(vfs_phone, (void *)buf, nbyte) != EOK) {
  179.         async_wait_for(req, NULL);
  180.         async_serialize_end();
  181.         futex_up(&vfs_phone_futex);
  182.         return (ssize_t) rc;
  183.     }
  184.     async_wait_for(req, &rc);
  185.     async_serialize_end();
  186.     futex_up(&vfs_phone_futex);
  187.     return (ssize_t) IPC_GET_ARG1(answer);
  188. }
  189.  
  190. off_t lseek(int fildes, off_t offset, int whence)
  191. {
  192.     int res;
  193.     ipcarg_t rc;
  194.  
  195.     futex_down(&vfs_phone_futex);
  196.     async_serialize_start();
  197.     if (vfs_phone < 0) {
  198.         res = vfs_connect();
  199.         if (res < 0) {
  200.             async_serialize_end();
  201.             futex_up(&vfs_phone_futex);
  202.             return res;
  203.         }
  204.     }
  205.        
  206.     off_t newoffs;
  207.     rc = async_req_3_1(vfs_phone, VFS_SEEK, fildes, offset, whence,
  208.         &newoffs);
  209.  
  210.     async_serialize_end();
  211.     futex_up(&vfs_phone_futex);
  212.  
  213.     if (rc != EOK)
  214.         return (off_t) -1;
  215.    
  216.     return newoffs;
  217. }
  218.  
  219. int ftruncate(int fildes, off_t length)
  220. {
  221.     int res;
  222.     ipcarg_t rc;
  223.    
  224.     futex_down(&vfs_phone_futex);
  225.     async_serialize_start();
  226.     if (vfs_phone < 0) {
  227.         res = vfs_connect();
  228.         if (res < 0) {
  229.             async_serialize_end();
  230.             futex_up(&vfs_phone_futex);
  231.             return res;
  232.         }
  233.     }
  234.     rc = async_req_2_0(vfs_phone, VFS_TRUNCATE, fildes, length);
  235.     async_serialize_end();
  236.     futex_up(&vfs_phone_futex);
  237.     return (int) rc;
  238. }
  239.  
  240. DIR *opendir(const char *dirname)
  241. {
  242.     DIR *dirp = malloc(sizeof(DIR));
  243.     if (!dirp)
  244.         return NULL;
  245.     dirp->fd = open(dirname, 0);    /* TODO: must be a directory */
  246.     if (!dirp->fd) {
  247.         free(dirp);
  248.         return NULL;
  249.     }
  250.     dirp->pos = 0;
  251.     return dirp;
  252. }
  253.  
  254. struct dirent *readdir(DIR *dirp)
  255. {
  256.     return NULL;    /* TODO */ 
  257. }
  258.  
  259. void rewinddir(DIR *dirp)
  260. {
  261.     dirp->pos = 0;
  262. }
  263.  
  264. int closedir(DIR *dirp)
  265. {
  266.     (void) close(dirp->fd);
  267.     free(dirp);
  268.     return 0;
  269. }
  270.  
  271. int close(int fildes)
  272. {
  273.     return 0;   /* TODO */
  274. }
  275.  
  276. /** @}
  277.  */
  278.