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2 | pj | 1 | /* |
2 | * Project: HARTIK (HA-rd R-eal TI-me K-ernel) |
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3 | * |
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4 | * Coordinators: Giorgio Buttazzo <giorgio@sssup.it> |
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5 | * Gerardo Lamastra <gerardo@sssup.it> |
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6 | * |
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7 | * Authors : Massimiliano Giorgi <massy@hartik.sssup.it> |
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8 | * (see authors.txt for full list of hartik's authors) |
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9 | * |
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10 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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11 | * |
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12 | * http://www.sssup.it |
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13 | * http://retis.sssup.it |
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14 | * http://hartik.sssup.it |
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15 | */ |
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16 | |||
17 | /* |
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18 | * Copyright (C) 1999 Massimiliano Giorgi |
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19 | * |
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20 | * This program is free software; you can redistribute it and/or modify |
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21 | * it under the terms of the GNU General Public License as published by |
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22 | * the Free Software Foundation; either version 2 of the License, or |
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23 | * (at your option) any later version. |
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24 | * |
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25 | * This program is distributed in the hope that it will be useful, |
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26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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28 | * GNU General Public License for more details. |
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29 | * |
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30 | * You should have received a copy of the GNU General Public License |
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31 | * along with this program; if not, write to the Free Software |
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32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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33 | * |
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34 | */ |
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35 | |||
36 | /* |
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37 | * CVS : $Id: file.h,v 1.1.1.1 2002-03-29 14:12:50 pj Exp $ |
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38 | * |
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39 | * File: $File$ |
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40 | * Revision: $Revision: 1.1.1.1 $ |
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41 | * Last update: $Date: 2002-03-29 14:12:50 $ |
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42 | */ |
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43 | |||
44 | /*** |
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45 | This files contains the "file" structure that rapresents??? a file in the system and functions |
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46 | to manage the local descriptors table of every process (not task). |
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47 | ***/ |
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48 | |||
49 | #ifndef __FILE_H__ |
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50 | #define __FILE_H__ |
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51 | |||
52 | #include <fs/types.h> |
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53 | #include <fs/limits.h> |
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54 | #include <fs/fsconf.h> |
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55 | #include <fs/task.h> |
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56 | #include <fs/assert.h> |
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57 | |||
58 | #ifdef MSDOS_FILESYSTEM |
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59 | #include "msdos/msdos_f.h" |
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60 | #endif |
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61 | |||
62 | #include "mutex.h" |
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63 | #include "inode.h" |
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64 | |||
65 | struct file { |
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66 | struct file *f_next; |
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67 | |||
68 | struct dentry *f_dentry; |
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69 | struct file_operations *f_op; |
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70 | |||
71 | |||
72 | /*__uint32_t f_flags; */ |
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73 | __loff_t f_pos; |
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74 | |||
75 | __uint32_t f_flag_isdir:1; |
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76 | |||
77 | unsigned int f_count; /* number of fd that point to this */ |
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78 | |||
79 | union { |
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80 | #ifdef MSDOS_FILESYSTEM |
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81 | struct msdos_file_info msdos_f; |
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82 | #endif |
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83 | unsigned dummy; |
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84 | } u; |
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85 | |||
86 | unsigned long f_reada, f_ramax, f_raend, f_ralen, f_rawin; |
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87 | unsigned int f_uid, f_gid; |
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88 | int f_error; |
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89 | unsigned long f_version; |
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90 | }; |
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91 | |||
92 | struct file_descriptors { |
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93 | struct file *fd_file[MAXOPENFILES]; |
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94 | |||
95 | __uint16_t fd_flags[MAXOPENFILES]; /* FD_CLOEXEC*/ |
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96 | __uint32_t fd_fflags[MAXOPENFILES]; /* O_CREAT, O_SYNC, O_RDONLY, ...*/ |
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97 | |||
98 | __mode_t fd_umask; |
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99 | char fd_cwd[MAXPATHNAMELEN+1]; |
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100 | struct dentry *fd_cwden; |
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101 | #ifdef MULTITHREAD |
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102 | __mutex_t fd_mutex; |
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103 | #endif |
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104 | }; |
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105 | |||
106 | /* if fd_file[fd] is |
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107 | * NULL -> fd is free |
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108 | * RESERVEDFD -> fd is reserved for console i/o |
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109 | * other -> fd is usuable |
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110 | */ |
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111 | #define RESERVEDFD ((void*)-1) |
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112 | |||
113 | int file_init(void); |
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114 | |||
115 | struct file *get_file(struct inode *ptr); |
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116 | void free_file(struct file *f); |
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117 | |||
118 | int get_fd(__pid_t pid, struct file *f); |
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119 | struct file *free_fd(__pid_t pid, int fd); |
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120 | |||
121 | void enums_file(void (*func)(struct file *)); |
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122 | |||
123 | /* does not aquire or release a lock! */ |
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124 | int __isvalid_fd(__pid_t pid, int fd); |
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125 | |||
126 | int __duplicate_fd(__pid_t pid, int fd, int low); |
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127 | |||
128 | /* ------ */ |
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129 | |||
130 | extern struct file_descriptors desctable[]; |
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131 | |||
132 | #ifdef MULTITHREAD |
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133 | |||
134 | extern __inline__ void lock_desctable(__pid_t pid) |
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135 | { |
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136 | __fs_mutex_lock(&desctable[pid].fd_mutex); |
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137 | } |
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138 | |||
139 | extern __inline__ void unlock_desctable(__pid_t pid) |
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140 | { |
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141 | __fs_mutex_unlock(&desctable[pid].fd_mutex); |
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142 | } |
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143 | |||
144 | extern __inline__ void init_mutex(__pid_t pid) |
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145 | { |
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146 | __fs_mutex_init(&desctable[pid].fd_mutex); |
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147 | } |
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148 | |||
149 | #else |
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150 | |||
151 | #define lock_desctable(pid) |
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152 | |||
153 | #define unlock_desctable(pid) |
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154 | |||
155 | #define init_mutex(pid) |
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156 | |||
157 | #endif |
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158 | |||
159 | extern __inline__ __mode_t *umask_ptr(__pid_t pid) |
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160 | { |
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161 | return &desctable[pid].fd_umask; |
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162 | } |
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163 | |||
164 | extern __inline__ char *cwd_ptr(__pid_t pid) |
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165 | { |
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166 | return desctable[pid].fd_cwd; |
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167 | } |
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168 | |||
169 | extern __inline__ struct dentry *cwden_ptr(__pid_t pid) |
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170 | { |
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171 | return desctable[pid].fd_cwden; |
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172 | } |
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173 | |||
174 | extern __inline__ struct file *file_ptr(__pid_t pid, int i) |
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175 | { |
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176 | return desctable[pid].fd_file[i]; |
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177 | } |
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178 | |||
179 | extern __inline__ int check_fd(__pid_t pid, int fd) |
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180 | { |
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181 | if (fd<0||fd>=MAXOPENFILES) return -1; |
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182 | _assert(pid>=0&&pid<MAXIMUMPROCESS); |
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183 | if (desctable[pid].fd_file[fd]==NULL) return -1; |
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184 | if (desctable[pid].fd_file[fd]==RESERVEDFD) return -1; |
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185 | if (desctable[pid].fd_file[fd]->f_count==0) return -1; |
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186 | return 0; |
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187 | } |
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188 | |||
189 | extern __inline__ __uint16_t *fildesflags_ptr(__pid_t pid, int i) |
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190 | { |
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191 | return &desctable[pid].fd_flags[i]; |
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192 | } |
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193 | |||
194 | extern __inline__ __uint32_t *fildesfflags_ptr(__pid_t pid, int i) |
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195 | { |
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196 | return &desctable[pid].fd_fflags[i]; |
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197 | } |
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198 | |||
199 | #endif |