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2404 | konopa | 1 | /* |
2 | * Copyright (c) 1987,1997, Prentice Hall |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use of the MINIX operating system in source and |
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6 | * binary forms, with or without modification, are permitted provided |
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7 | * that the following conditions are met: |
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8 | |||
9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | |||
12 | * - Redistributions in binary form must reproduce the above |
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13 | * copyright notice, this list of conditions and the following |
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14 | * disclaimer in the documentation and/or other materials provided |
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15 | * with the distribution. |
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16 | |||
17 | * - Neither the name of Prentice Hall nor the names of the software |
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18 | * authors or contributors may be used to endorse or promote |
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19 | * products derived from this software without specific prior |
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20 | * written permission. |
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21 | |||
22 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND |
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23 | * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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24 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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26 | * IN NO EVENT SHALL PRENTICE HALL OR ANY AUTHORS OR CONTRIBUTORS BE |
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27 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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28 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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29 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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30 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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31 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
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32 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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33 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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34 | */ |
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2435 | jelen | 35 | |
36 | /** @addtogroup FileSystemImpl |
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37 | * @{ |
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38 | */ |
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2404 | konopa | 39 | |
2435 | jelen | 40 | /** |
41 | * @file stadir.c |
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42 | * @brief This file contains the code for performing four system calls relating to |
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43 | * status and directories. |
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2380 | konopa | 44 | */ |
45 | |||
46 | |||
47 | #include "fs.h" |
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48 | #include "stat.h" |
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49 | #include "file.h" |
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50 | #include "fproc.h" |
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51 | #include "inode.h" |
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52 | #include "param.h" |
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53 | |||
54 | |||
55 | static int change(inode_t **iip, char *name_ptr, int len); |
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56 | static int stat_inode(inode_t *rip, filp_t *fil_ptr, char *user_addr); |
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2435 | jelen | 57 | |
58 | /** |
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59 | * Perform the CHDIR system call |
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60 | */ |
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2380 | konopa | 61 | int do_chdir() |
62 | { |
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63 | |||
64 | /* Perform the chdir(file_name) system call */ |
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65 | int r; |
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66 | |||
67 | r = change(&fp->fp_workdir, file_name, strlen(file_name)+1); |
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68 | |||
69 | return r; |
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70 | } |
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2435 | jelen | 71 | |
72 | /** |
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73 | * Execute changing the current directory |
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74 | */ |
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2380 | konopa | 75 | int change(inode_t **iip, char *name_ptr, int len) |
76 | { |
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77 | |||
78 | /* |
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79 | * iip: pointer to the inode pointer for the dir |
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80 | * name_ptr: pointer to the directory name to change to |
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81 | * len: length of the directory name string |
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82 | */ |
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83 | |||
84 | /* Do the actual work for chdir() and chroot(). */ |
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85 | |||
86 | inode_t *rip; |
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87 | register int r; |
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88 | |||
89 | r = OK; |
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90 | |||
91 | /* Try to open the new directory. */ |
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92 | if (fetch_name(name_ptr, len) != OK) |
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93 | return err_code; |
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94 | |||
95 | if ((rip = eat_path(user_path)) == NIL_INODE) |
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96 | return err_code; |
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97 | |||
98 | /* It must be a directory and also be searchable. */ |
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99 | if ((rip->i_mode & I_TYPE) != I_DIRECTORY) |
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100 | r = FS_ENOTDIR; |
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101 | |||
102 | /* If error, return inode. */ |
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103 | if (r != OK) { |
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104 | put_inode(rip); |
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105 | return r; |
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106 | } |
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107 | |||
108 | /* Everything is OK. Make the change. */ |
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109 | put_inode(*iip); /* release the old directory */ |
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110 | *iip = rip; /* acquire the new one */ |
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111 | |||
112 | return OK; |
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113 | } |
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2435 | jelen | 114 | |
115 | /** |
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116 | * Perform the STAT system call |
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117 | */ |
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2380 | konopa | 118 | int do_stat() |
119 | { |
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120 | |||
121 | /* Perform the stat(name, buf) system call. */ |
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122 | |||
123 | register inode_t *rip; |
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124 | register int r; |
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125 | |||
126 | /* Both stat() and fstat() use the same routine to do the real work. That |
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127 | * routine expects an inode, so acquire it temporarily. |
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128 | */ |
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129 | |||
130 | if (fetch_name(file_name, strlen(file_name)+1) != OK) |
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131 | return err_code; |
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2404 | konopa | 132 | |
2380 | konopa | 133 | if ((rip = eat_path(user_path)) == NIL_INODE) |
134 | return err_code; |
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2404 | konopa | 135 | |
2380 | konopa | 136 | r = stat_inode(rip, NIL_FILP, fp->buffer); /* actually do the work.*/ |
137 | put_inode(rip); /* release the inode */ |
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138 | |||
139 | return r; |
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140 | } |
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2435 | jelen | 141 | |
142 | /** |
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143 | * Perform the FSTAT system call |
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144 | */ |
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2380 | konopa | 145 | int do_fstat() |
146 | { |
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147 | |||
148 | /* Perform the fstat(fd, buf) system call. */ |
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149 | |||
150 | register filp_t *rfilp; |
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151 | |||
152 | |||
153 | /* Is the file descriptor valid? */ |
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154 | if ((rfilp = get_filp(fd)) == NIL_FILP) |
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155 | return err_code; |
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156 | |||
157 | if (rfilp->filp_ino == NIL_INODE) |
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158 | return FS_ENOENT; |
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159 | |||
160 | return(stat_inode(rfilp->filp_ino, NIL_FILP, fp->buffer)); |
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161 | } |
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2435 | jelen | 162 | |
163 | /** |
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164 | * Execute the actual STAT operation |
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165 | */ |
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2380 | konopa | 166 | int stat_inode(register inode_t *rip, filp_t *fil_ptr, char *user_addr) |
167 | { |
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168 | |||
169 | /* |
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170 | * rip: pointer to inode to stat |
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171 | * fil_ptr: filp pointer, supplied by 'fstat' |
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172 | * user_addr: user space address where stat buf goes |
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173 | */ |
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174 | |||
175 | /* Common code for stat and fstat system calls. */ |
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176 | |||
177 | stat_t statbuf; |
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178 | |||
179 | /* Fill in the statbuf struct. */ |
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180 | statbuf.st_ino = rip->i_num; |
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181 | statbuf.st_mode = rip->i_mode; |
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182 | statbuf.st_nlink = rip->i_nlinks & BYTE; |
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183 | statbuf.st_size = rip->i_size; |
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184 | |||
185 | /* Copy infomations to userspace. */ |
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186 | memcpy(user_addr, &statbuf, sizeof(statbuf)); |
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187 | |||
188 | return OK; |
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189 | } |
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190 | |||
2435 | jelen | 191 | |
192 | /** |
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193 | * } |
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194 | */ |
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195 |