Mercurial > octave
annotate liboctave/system/file-stat.h @ 23206:525c36d5f985 stable
Workaround segfault in file_stat (bug #50234).
* file-stat.cc (file_stat): Move constructor from header file.
* file-stat.cc (~file_stat): Move destructor from header file.
* file-stat.h: (file_stat): Declare constructor only.
* file-stat.h: (~file_stat): Declare destructor only.
author | Rik <rik@octave.org> |
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date | Sun, 19 Feb 2017 19:42:44 -0800 |
parents | e9a0469dedd9 |
children | 8fd8ed1e3aa2 3ac9f9ecfae5 |
rev | line source |
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2926 | 1 /* |
2 | |
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3 Copyright (C) 1996-2016 John W. Eaton |
2926 | 4 |
5 This file is part of Octave. | |
6 | |
7 Octave is free software; you can redistribute it and/or modify it | |
8 under the terms of the GNU General Public License as published by the | |
7016 | 9 Free Software Foundation; either version 3 of the License, or (at your |
10 option) any later version. | |
2926 | 11 |
12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
7016 | 18 along with Octave; see the file COPYING. If not, see |
19 <http://www.gnu.org/licenses/>. | |
2926 | 20 |
21 */ | |
22 | |
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23 #if ! defined (octave_file_stat_h) |
2926 | 24 #define octave_file_stat_h 1 |
25 | |
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26 #include "octave-config.h" |
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27 |
2926 | 28 #include <string> |
29 | |
3260 | 30 #include "oct-time.h" |
31 | |
2926 | 32 #include <sys/types.h> |
33 | |
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34 namespace octave |
2926 | 35 { |
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36 namespace sys |
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37 { |
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38 class |
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39 OCTAVE_API |
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40 base_file_stat |
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41 { |
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42 public: |
2926 | 43 |
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44 base_file_stat (void) |
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45 : initialized (false), fail (false), errmsg (), m_mode (), |
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46 m_ino (), m_dev (), m_nlink (), m_uid (), m_gid (), |
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47 m_size (), m_atime (), m_mtime (), m_ctime (), m_rdev (), |
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48 m_blksize (), m_blocks () { } |
8549 | 49 |
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50 base_file_stat (const base_file_stat& fs) |
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51 : initialized (fs.initialized), fail (fs.fail), errmsg (fs.errmsg), |
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52 m_mode (fs.m_mode), m_ino (fs.m_ino), m_dev (fs.m_dev), |
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53 m_nlink (fs.m_nlink), m_uid (fs.m_uid), m_gid (fs.m_gid), |
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54 m_size (fs.m_size), m_atime (fs.m_atime), m_mtime (fs.m_mtime), |
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55 m_ctime (fs.m_ctime), m_rdev (fs.m_rdev), |
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56 m_blksize (fs.m_blksize), m_blocks (fs.m_blocks) { } |
8549 | 57 |
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58 base_file_stat& operator = (const base_file_stat& fs) |
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59 { |
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60 if (this != &fs) |
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61 { |
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62 initialized = fs.initialized; |
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63 fail = fs.fail; |
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64 errmsg = fs.errmsg; |
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65 m_mode = fs.m_mode; |
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66 m_ino = fs.m_ino; |
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67 m_dev = fs.m_dev; |
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68 m_nlink = fs.m_nlink; |
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69 m_uid = fs.m_uid; |
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70 m_gid = fs.m_gid; |
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71 m_size = fs.m_size; |
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72 m_atime = fs.m_atime; |
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73 m_mtime = fs.m_mtime; |
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74 m_ctime = fs.m_ctime; |
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75 m_rdev = fs.m_rdev; |
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76 m_blksize = fs.m_blksize; |
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77 m_blocks = fs.m_blocks; |
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78 } |
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79 |
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80 return *this; |
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81 } |
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82 |
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83 // The minimum difference in file time stamp values. |
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84 // FIXME: This value should come from the filesystem itself. |
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85 // How can we get that info? |
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86 octave::sys::time time_resolution (void) const |
2926 | 87 { |
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88 static octave::sys::time resolution (1.0); |
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89 return resolution; |
2926 | 90 } |
91 | |
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92 // File status and info. The is_XXX functions will return false for |
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93 // file_stat objects that are not properly initialized. The others |
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94 // should all return 0 (or the equivalent, for the given object) |
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95 // which is likely not meaningful. |
2926 | 96 |
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97 bool is_blk (void) const; |
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98 bool is_chr (void) const; |
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99 bool is_dir (void) const; |
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100 bool is_fifo (void) const; |
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101 bool is_lnk (void) const; |
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102 bool is_reg (void) const; |
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103 bool is_sock (void) const; |
2926 | 104 |
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105 static bool is_blk (mode_t mode); |
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106 static bool is_chr (mode_t mode); |
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107 static bool is_dir (mode_t mode); |
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108 static bool is_fifo (mode_t mode); |
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109 static bool is_lnk (mode_t mode); |
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110 static bool is_reg (mode_t mode); |
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111 static bool is_sock (mode_t mode); |
2926 | 112 |
21935 | 113 static bool have_struct_stat_st_rdev (void); |
114 static bool have_struct_stat_st_blksize (void); | |
115 static bool have_struct_stat_st_blocks (void); | |
116 | |
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117 ino_t ino (void) const { return m_ino; } |
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118 dev_t dev (void) const { return m_dev; } |
5476 | 119 |
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120 nlink_t nlink (void) const { return m_nlink; } |
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121 |
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122 uid_t uid (void) const { return m_uid; } |
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123 gid_t gid (void) const { return m_gid; } |
2926 | 124 |
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125 off_t size (void) const { return m_size; } |
2926 | 126 |
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127 octave::sys::time atime (void) const { return m_atime; } |
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128 octave::sys::time mtime (void) const { return m_mtime; } |
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129 octave::sys::time ctime (void) const { return m_ctime; } |
2926 | 130 |
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131 dev_t rdev (void) const { return m_rdev; } |
2926 | 132 |
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133 long blksize (void) const { return m_blksize; } |
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134 long blocks (void) const { return m_blocks; } |
2926 | 135 |
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136 mode_t mode (void) const { return m_mode; } |
2926 | 137 |
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138 std::string mode_as_string (void) const; |
5476 | 139 |
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140 bool ok (void) const { return initialized && ! fail; } |
2926 | 141 |
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142 operator bool () const { return ok (); } |
2926 | 143 |
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144 bool exists (void) const { return ok (); } |
2926 | 145 |
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146 std::string error (void) const { return ok () ? "" : errmsg; } |
2926 | 147 |
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148 // Has the file referenced by this object been modified since TIME? |
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149 bool is_newer (const octave::sys::time& time) const { return m_mtime > time; } |
2926 | 150 |
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151 // It's nice to be able to hide the file_stat object if we don't |
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152 // really care about it. |
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153 static int is_newer (const std::string&, const octave::sys::time&); |
2926 | 154 |
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155 protected: |
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156 |
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157 virtual ~base_file_stat (void) { } |
2926 | 158 |
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159 // TRUE means we have already called stat. |
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160 bool initialized; |
2926 | 161 |
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162 // TRUE means the stat for this file failed. |
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163 bool fail; |
2926 | 164 |
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165 // If a failure occurs, this contains the system error text. |
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166 std::string errmsg; |
2926 | 167 |
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168 // file type and permissions |
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169 mode_t m_mode; |
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171 // serial number |
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172 ino_t m_ino; |
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174 // device number |
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175 dev_t m_dev; |
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177 // number of links |
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178 nlink_t m_nlink; |
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180 // user ID of owner |
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181 uid_t m_uid; |
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183 // group ID of owner |
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184 gid_t m_gid; |
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186 // size in bytes, for regular files |
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187 off_t m_size; |
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189 // time of last access |
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190 octave::sys::time m_atime; |
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192 // time of last modification |
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193 octave::sys::time m_mtime; |
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195 // time of last file status change |
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196 octave::sys::time m_ctime; |
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197 |
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198 // device number for special files |
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199 dev_t m_rdev; |
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201 // best I/O block size |
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202 long m_blksize; |
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203 |
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204 // number of 512-byte blocks allocated |
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205 long m_blocks; |
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206 }; |
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208 class |
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209 OCTAVE_API |
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210 file_stat : public base_file_stat |
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211 { |
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212 public: |
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214 // This constructor must remain defined in the cpp file rather than in |
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215 // the header file (bug #50234). |
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216 file_stat (const std::string& n = "", bool fl = true); |
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218 file_stat (const file_stat& fs) |
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219 : base_file_stat (fs), file_name (fs.file_name), |
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220 follow_links (fs.follow_links) { } |
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222 file_stat& operator = (const file_stat& fs) |
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223 { |
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224 if (this != &fs) |
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225 { |
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226 base_file_stat::operator = (fs); |
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228 file_name = fs.file_name; |
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229 follow_links = fs.follow_links; |
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230 } |
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232 return *this; |
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233 } |
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235 // This destructor must remain as an empty destructor defined in the |
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236 // cpp file rather than in the header file (bug #50234). |
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237 ~file_stat (void); |
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239 void get_stats (bool force = false) |
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240 { |
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241 if (! initialized || force) |
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242 update_internal (force); |
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243 } |
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245 void get_stats (const std::string& n, bool force = false) |
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246 { |
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247 if (n != file_name || ! initialized || force) |
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248 { |
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249 initialized = false; |
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250 |
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251 file_name = n; |
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253 update_internal (force); |
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254 } |
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255 } |
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257 private: |
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258 |
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259 // Name of the file. |
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260 std::string file_name; |
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262 // TRUE means follow symbolic links to the ultimate file (stat). |
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263 // FALSE means get information about the link itself (lstat). |
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264 bool follow_links; |
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266 void update_internal (bool force = false); |
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267 }; |
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269 class |
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270 OCTAVE_API |
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271 file_fstat : public base_file_stat |
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272 { |
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273 public: |
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274 |
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275 file_fstat (int n) : base_file_stat (), fid (n) |
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277 update_internal (); |
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279 | |
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280 file_fstat (const file_fstat& fs) |
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281 : base_file_stat (fs), fid (fs.fid) { } |
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283 file_fstat& operator = (const file_fstat& fs) |
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284 { |
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285 if (this != &fs) |
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286 { |
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287 base_file_stat::operator = (fs); |
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288 |
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289 fid = fs.fid; |
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290 } |
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292 return *this; |
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293 } |
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294 |
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295 ~file_fstat (void) { } |
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297 void get_stats (bool force = false) |
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298 { |
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299 if (! initialized || force) |
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300 update_internal (force); |
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301 } |
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302 |
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303 void get_stats (int n, bool force = false) |
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305 if (n != fid || ! initialized || force) |
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306 { |
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307 initialized = false; |
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309 fid = n; |
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311 update_internal (force); |
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312 } |
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314 |
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315 private: |
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316 |
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317 // Open file descriptor. |
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318 int fid; |
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320 void update_internal (bool force = false); |
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321 }; |
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322 } |
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323 } |
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324 |
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325 #if defined (OCTAVE_USE_DEPRECATED_FUNCTIONS) |
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327 OCTAVE_DEPRECATED ("use 'octave::sys::base_file_stat' instead") |
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328 typedef octave::sys::base_file_stat base_file_stat; |
8549 | 329 |
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330 OCTAVE_DEPRECATED ("use 'octave::sys::file_stat' instead") |
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331 typedef octave::sys::file_stat file_stat; |
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332 |
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333 OCTAVE_DEPRECATED ("use 'octave::sys::file_fstat' instead") |
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334 typedef octave::sys::file_fstat file_fstat; |
2926 | 335 |
336 #endif | |
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337 |
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338 #endif |