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| 2 | pj | 1 | /* |
| 2 | * Project: S.Ha.R.K. |
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| 3 | * |
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| 4 | * Coordinators: |
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| 5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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| 6 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 7 | * |
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| 8 | * Authors : |
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| 9 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 10 | * Massimiliano Giorgi <massy@gandalf.sssup.it> |
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| 11 | * Luca Abeni <luca@gandalf.sssup.it> |
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| 12 | * (see the web pages for full authors list) |
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| 13 | * |
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| 14 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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| 15 | * |
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| 16 | * http://www.sssup.it |
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| 17 | * http://retis.sssup.it |
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| 18 | * http://shark.sssup.it |
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| 19 | */ |
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| 20 | |||
| 21 | /* |
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| 22 | * Copyright (C) 1999 Massimiliano Giorgi |
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| 23 | * |
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| 24 | * This program is free software; you can redistribute it and/or modify |
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| 25 | * it under the terms of the GNU General Public License as published by |
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| 26 | * the Free Software Foundation; either version 2 of the License, or |
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| 27 | * (at your option) any later version. |
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| 28 | * |
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| 29 | * This program is distributed in the hope that it will be useful, |
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| 30 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 31 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 32 | * GNU General Public License for more details. |
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| 33 | * |
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| 34 | * You should have received a copy of the GNU General Public License |
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| 35 | * along with this program; if not, write to the Free Software |
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| 36 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 37 | * |
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| 38 | */ |
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| 39 | |||
| 40 | /* |
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| 41 | * CVS : $Id: dir.c,v 1.1.1.1 2002-03-29 14:12:53 pj Exp $ |
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| 42 | * |
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| 43 | * File: $File$ |
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| 44 | * Revision: $Revision: 1.1.1.1 $ |
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| 45 | * Last update: $Date: 2002-03-29 14:12:53 $ |
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| 46 | */ |
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| 47 | |||
| 48 | #include <features.h> |
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| 49 | |||
| 50 | #include <fs/syscall.h> |
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| 51 | |||
| 52 | //#define __need_FOPEN_MAX |
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| 53 | //#include <bits/stdio_li.h> |
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| 54 | |||
| 55 | #include <sys/types.h> |
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| 56 | #include <limits.h> |
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| 57 | #include <dirent.h> |
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| 58 | |||
| 59 | #include "errno.h" |
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| 60 | #include "mutex.h" |
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| 61 | |||
| 62 | #define MAXOPENDIR 256 |
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| 63 | |||
| 64 | struct __dirstream { |
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| 65 | int dir_next; |
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| 66 | |||
| 67 | int dir_h; |
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| 68 | struct dirent dir_e; |
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| 69 | |||
| 70 | int32_t dir_used:1; |
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| 71 | int32_t dir_inprogress:1; |
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| 72 | }; |
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| 73 | |||
| 74 | #define NIL -1 |
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| 75 | |||
| 76 | static DIR direntry[MAXOPENDIR]; |
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| 77 | static int freedirentry; |
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| 78 | static _priv_mutex_t direntrymutex; |
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| 79 | |||
| 80 | extern int k_opendir(const char *pathname); |
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| 81 | extern int k_closedir(int fd); |
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| 82 | extern int k_readdir(int fd, struct dirent *den); |
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| 83 | |||
| 84 | int dir_initialize(void) |
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| 85 | { |
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| 86 | int i; |
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| 87 | _priv_mutex_init(&direntrymutex); |
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| 88 | |||
| 89 | //cprintf("<mutex on %p [DIR_INITIALIZE]>",&direntrymutex); |
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| 90 | |||
| 91 | freedirentry=0; |
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| 92 | for (i=0;i<MAXOPENDIR;i++) { |
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| 93 | direntry[i].dir_next=i+1; |
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| 94 | direntry[i].dir_h=-1; |
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| 95 | direntry[i].dir_used=0; |
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| 96 | direntry[i].dir_inprogress=0; |
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| 97 | } |
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| 98 | direntry[MAXOPENDIR-1].dir_next=NIL; |
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| 99 | return 0; |
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| 100 | } |
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| 101 | |||
| 102 | DIR *opendir(const char *pathname) |
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| 103 | { |
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| 104 | int ind,res; |
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| 105 | |||
| 106 | _priv_mutex_lock(&direntrymutex); |
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| 107 | ind=freedirentry; |
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| 108 | if (ind!=NIL) freedirentry=direntry[ind].dir_next; |
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| 109 | _priv_mutex_unlock(&direntrymutex); |
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| 110 | |||
| 111 | if (ind==NIL) { |
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| 112 | __set_errno(EMFILE); |
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| 113 | return NULL; |
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| 114 | } |
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| 115 | |||
| 116 | res=SYS_CALL1(k_opendir,pathname); |
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| 117 | |||
| 118 | if (ISERROR(res)) { |
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| 119 | |||
| 120 | _priv_mutex_lock(&direntrymutex); |
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| 121 | direntry[ind].dir_next=freedirentry; |
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| 122 | freedirentry=ind; |
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| 123 | _priv_mutex_unlock(&direntrymutex); |
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| 124 | |||
| 125 | __set_errno(-res); |
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| 126 | return NULL; |
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| 127 | } |
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| 128 | |||
| 129 | direntry[ind].dir_h=res; |
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| 130 | direntry[ind].dir_inprogress=0; |
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| 131 | direntry[ind].dir_used=1; |
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| 132 | |||
| 133 | return direntry+ind; |
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| 134 | } |
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| 135 | |||
| 136 | int closedir(DIR *d) |
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| 137 | { |
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| 138 | int res; |
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| 139 | |||
| 140 | if (d<direntry||d>direntry+MAXOPENDIR) { |
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| 141 | __set_errno(EBADF); |
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| 142 | return -1; |
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| 143 | } |
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| 144 | |||
| 145 | _priv_mutex_lock(&direntrymutex); |
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| 146 | if (d->dir_used==0) { |
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| 147 | _priv_mutex_unlock(&direntrymutex); |
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| 148 | __set_errno(EBADF); |
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| 149 | return -1; |
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| 150 | } |
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| 151 | if (d->dir_inprogress) { |
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| 152 | _priv_mutex_unlock(&direntrymutex); |
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| 153 | __set_errno(EBUSY); |
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| 154 | return -1; |
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| 155 | } |
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| 156 | d->dir_used=0; |
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| 157 | _priv_mutex_unlock(&direntrymutex); |
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| 158 | |||
| 159 | res=SYS_CALL1(k_closedir,d->dir_h); |
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| 160 | |||
| 161 | if (ISERROR(res)) { |
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| 162 | d->dir_used=1; |
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| 163 | __set_errno(-res); |
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| 164 | return -1; |
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| 165 | } |
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| 166 | |||
| 167 | _priv_mutex_lock(&direntrymutex); |
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| 168 | d->dir_h=-1; |
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| 169 | d->dir_used=0; |
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| 170 | d->dir_inprogress=0; |
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| 171 | d->dir_next=freedirentry; |
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| 172 | freedirentry=d-direntry; |
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| 173 | _priv_mutex_unlock(&direntrymutex); |
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| 174 | |||
| 175 | return 0; |
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| 176 | } |
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| 177 | |||
| 178 | struct dirent *readdir(DIR *d) |
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| 179 | { |
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| 180 | int res; |
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| 181 | |||
| 182 | if (d<direntry||d>direntry+MAXOPENDIR) { |
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| 183 | __set_errno(EBADF); |
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| 184 | return NULL; |
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| 185 | } |
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| 186 | |||
| 187 | _priv_mutex_lock(&direntrymutex); |
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| 188 | if (!d->dir_used) { |
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| 189 | _priv_mutex_unlock(&direntrymutex); |
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| 190 | __set_errno(EBADF); |
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| 191 | return NULL; |
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| 192 | } |
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| 193 | d->dir_inprogress=1; |
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| 194 | _priv_mutex_unlock(&direntrymutex); |
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| 195 | |||
| 196 | res=SYS_CALL2(k_readdir,d->dir_h,&d->dir_e); |
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| 197 | d->dir_inprogress=0; |
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| 198 | if (res==1) return NULL; |
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| 199 | |||
| 200 | if (ISERROR(res)) { |
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| 201 | __set_errno(-res); |
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| 202 | return NULL; |
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| 203 | } |
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| 204 | |||
| 205 | return &d->dir_e; |
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| 206 | } |
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| 207 | |||
| 208 | int readdir_t(DIR *d,struct dirent *den, struct dirent **result) |
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| 209 | { |
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| 210 | int res; |
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| 211 | |||
| 212 | if (d<direntry||d>direntry+MAXOPENDIR) { |
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| 213 | __set_errno(EBADF); |
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| 214 | return -1; |
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| 215 | } |
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| 216 | |||
| 217 | _priv_mutex_lock(&direntrymutex); |
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| 218 | if (!d->dir_used) { |
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| 219 | _priv_mutex_unlock(&direntrymutex); |
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| 220 | __set_errno(EBADF); |
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| 221 | return -1; |
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| 222 | } |
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| 223 | d->dir_inprogress=1; |
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| 224 | _priv_mutex_unlock(&direntrymutex); |
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| 225 | |||
| 226 | res=SYS_CALL2(k_readdir,d->dir_h,den); |
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| 227 | d->dir_inprogress=0; |
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| 228 | |||
| 229 | if (res==1) { |
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| 230 | *result=NULL; |
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| 231 | return 0; |
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| 232 | } |
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| 233 | |||
| 234 | if (ISERROR(res)) { |
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| 235 | __set_errno(-res); |
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| 236 | return -1; |
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| 237 | } |
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| 238 | |||
| 239 | return 0; |
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| 240 | } |