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Rev | Author | Line No. | Line |
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5217 | serge | 1 | /* rename.c -- rename a file, preserving symlinks. |
6324 | serge | 2 | Copyright (C) 1999-2015 Free Software Foundation, Inc. |
5217 | serge | 3 | |
4 | This file is part of GNU Binutils. |
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5 | |||
6 | This program is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 3 of the License, or |
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9 | (at your option) any later version. |
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10 | |||
11 | This program is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |||
16 | You should have received a copy of the GNU General Public License |
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17 | along with this program; if not, write to the Free Software |
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18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA |
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19 | 02110-1301, USA. */ |
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20 | |||
21 | #include "sysdep.h" |
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22 | #include "bfd.h" |
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23 | #include "bucomm.h" |
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24 | |||
25 | #ifdef HAVE_GOOD_UTIME_H |
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26 | #include |
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27 | #else /* ! HAVE_GOOD_UTIME_H */ |
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28 | #ifdef HAVE_UTIMES |
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29 | #include |
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30 | #endif /* HAVE_UTIMES */ |
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31 | #endif /* ! HAVE_GOOD_UTIME_H */ |
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32 | |||
33 | #if ! defined (_WIN32) || defined (__CYGWIN32__) |
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34 | static int simple_copy (const char *, const char *); |
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35 | |||
36 | /* The number of bytes to copy at once. */ |
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37 | #define COPY_BUF 8192 |
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38 | |||
39 | /* Copy file FROM to file TO, performing no translations. |
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40 | Return 0 if ok, -1 if error. */ |
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41 | |||
42 | static int |
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43 | simple_copy (const char *from, const char *to) |
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44 | { |
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45 | int fromfd, tofd, nread; |
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46 | int saved; |
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47 | char buf[COPY_BUF]; |
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48 | |||
49 | fromfd = open (from, O_RDONLY | O_BINARY); |
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50 | if (fromfd < 0) |
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51 | return -1; |
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52 | #ifdef O_CREAT |
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53 | tofd = open (to, O_CREAT | O_WRONLY | O_TRUNC | O_BINARY, 0777); |
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54 | #else |
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55 | tofd = creat (to, 0777); |
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56 | #endif |
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57 | if (tofd < 0) |
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58 | { |
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59 | saved = errno; |
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60 | close (fromfd); |
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61 | errno = saved; |
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62 | return -1; |
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63 | } |
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64 | while ((nread = read (fromfd, buf, sizeof buf)) > 0) |
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65 | { |
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66 | if (write (tofd, buf, nread) != nread) |
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67 | { |
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68 | saved = errno; |
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69 | close (fromfd); |
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70 | close (tofd); |
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71 | errno = saved; |
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72 | return -1; |
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73 | } |
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74 | } |
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75 | saved = errno; |
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76 | close (fromfd); |
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77 | close (tofd); |
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78 | if (nread < 0) |
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79 | { |
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80 | errno = saved; |
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81 | return -1; |
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82 | } |
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83 | return 0; |
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84 | } |
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85 | #endif /* __CYGWIN32__ or not _WIN32 */ |
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86 | |||
87 | /* Set the times of the file DESTINATION to be the same as those in |
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88 | STATBUF. */ |
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89 | |||
90 | void |
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91 | set_times (const char *destination, const struct stat *statbuf) |
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92 | { |
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93 | int result; |
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94 | |||
95 | { |
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96 | #ifdef HAVE_GOOD_UTIME_H |
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97 | struct utimbuf tb; |
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98 | |||
99 | tb.actime = statbuf->st_atime; |
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100 | tb.modtime = statbuf->st_mtime; |
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101 | // result = utime (destination, &tb); |
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102 | #else /* ! HAVE_GOOD_UTIME_H */ |
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103 | #ifndef HAVE_UTIMES |
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104 | long tb[2]; |
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105 | |||
106 | tb[0] = statbuf->st_atime; |
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107 | tb[1] = statbuf->st_mtime; |
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108 | result = utime (destination, tb); |
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109 | #else /* HAVE_UTIMES */ |
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110 | struct timeval tv[2]; |
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111 | |||
112 | tv[0].tv_sec = statbuf->st_atime; |
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113 | tv[0].tv_usec = 0; |
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114 | tv[1].tv_sec = statbuf->st_mtime; |
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115 | tv[1].tv_usec = 0; |
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116 | result = utimes (destination, tv); |
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117 | #endif /* HAVE_UTIMES */ |
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118 | #endif /* ! HAVE_GOOD_UTIME_H */ |
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119 | } |
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120 | |||
121 | if (result != 0) |
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122 | non_fatal (_("%s: cannot set time: %s"), destination, strerror (errno)); |
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123 | } |
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124 | |||
125 | #ifndef S_ISLNK |
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126 | #ifdef S_IFLNK |
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127 | #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK) |
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128 | #else |
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129 | #define S_ISLNK(m) 0 |
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130 | #define lstat stat |
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131 | #endif |
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132 | #endif |
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133 | |||
134 | /* Rename FROM to TO, copying if TO is a link. |
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135 | Return 0 if ok, -1 if error. */ |
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136 | |||
137 | int |
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138 | smart_rename (const char *from, const char *to, int preserve_dates ATTRIBUTE_UNUSED) |
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139 | { |
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140 | bfd_boolean exists; |
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141 | struct stat s; |
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142 | int ret = 0; |
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143 | |||
144 | exists = lstat (to, &s) == 0; |
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145 | |||
146 | #if 1 |
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147 | /* Win32, unlike unix, will not erase `to' in `rename(from, to)' but |
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148 | fail instead. Also, chown is not present. */ |
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149 | |||
150 | if (exists) |
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151 | remove (to); |
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152 | |||
153 | ret = rename (from, to); |
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154 | if (ret != 0) |
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155 | { |
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156 | /* We have to clean up here. */ |
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157 | non_fatal (_("unable to rename '%s'; reason: %s"), to, strerror (errno)); |
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158 | unlink (from); |
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159 | } |
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160 | #else |
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161 | /* Use rename only if TO is not a symbolic link and has |
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162 | only one hard link, and we have permission to write to it. */ |
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163 | if (! exists |
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164 | || (!S_ISLNK (s.st_mode) |
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165 | && S_ISREG (s.st_mode) |
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166 | && (s.st_mode & S_IWUSR) |
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167 | && s.st_nlink == 1) |
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168 | ) |
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169 | { |
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170 | ret = rename (from, to); |
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171 | if (ret == 0) |
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172 | { |
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173 | if (exists) |
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174 | { |
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175 | /* Try to preserve the permission bits and ownership of |
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176 | TO. First get the mode right except for the setuid |
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177 | bit. Then change the ownership. Then fix the setuid |
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178 | bit. We do the chmod before the chown because if the |
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179 | chown succeeds, and we are a normal user, we won't be |
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180 | able to do the chmod afterward. We don't bother to |
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181 | fix the setuid bit first because that might introduce |
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182 | a fleeting security problem, and because the chown |
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183 | will clear the setuid bit anyhow. We only fix the |
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184 | setuid bit if the chown succeeds, because we don't |
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185 | want to introduce an unexpected setuid file owned by |
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186 | the user running objcopy. */ |
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187 | // chmod (to, s.st_mode & 0777); |
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188 | // if (chown (to, s.st_uid, s.st_gid) >= 0) |
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189 | // chmod (to, s.st_mode & 07777); |
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190 | } |
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191 | } |
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192 | else |
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193 | { |
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194 | /* We have to clean up here. */ |
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195 | non_fatal (_("unable to rename '%s'; reason: %s"), to, strerror (errno)); |
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196 | unlink (from); |
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197 | } |
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198 | } |
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199 | else |
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200 | { |
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201 | ret = simple_copy (from, to); |
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202 | if (ret != 0) |
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203 | non_fatal (_("unable to copy file '%s'; reason: %s"), to, strerror (errno)); |
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204 | |||
205 | if (preserve_dates) |
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206 | set_times (to, &s); |
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207 | unlink (from); |
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208 | } |
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209 | #endif /* _WIN32 && !__CYGWIN32__ */ |
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210 | |||
211 | return ret; |
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212 | }>>> |