Commit | Line | Data |
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252b5132 | 1 | /* rename.c -- rename a file, preserving symlinks. |
b34976b6 | 2 | Copyright 1999, 2002 Free Software Foundation, Inc. |
252b5132 RH |
3 | |
4 | This file is part of GNU Binutils. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
19 | 02111-1307, USA. */ | |
20 | ||
21 | #include "bfd.h" | |
22 | #include "bucomm.h" | |
23 | ||
24 | #include <sys/stat.h> | |
25 | ||
26 | #ifdef HAVE_GOOD_UTIME_H | |
27 | #include <utime.h> | |
28 | #else /* ! HAVE_GOOD_UTIME_H */ | |
29 | #ifdef HAVE_UTIMES | |
30 | #include <sys/time.h> | |
31 | #endif /* HAVE_UTIMES */ | |
32 | #endif /* ! HAVE_GOOD_UTIME_H */ | |
33 | ||
18226413 ILT |
34 | /* We need to open the file in binary modes on system where that makes |
35 | a difference. */ | |
36 | #ifndef O_BINARY | |
37 | #define O_BINARY 0 | |
38 | #endif | |
39 | ||
b34976b6 AM |
40 | static int simple_copy |
41 | PARAMS ((const char *, const char *)); | |
252b5132 RH |
42 | |
43 | /* The number of bytes to copy at once. */ | |
44 | #define COPY_BUF 8192 | |
45 | ||
46 | /* Copy file FROM to file TO, performing no translations. | |
47 | Return 0 if ok, -1 if error. */ | |
48 | ||
49 | static int | |
50 | simple_copy (from, to) | |
51 | const char *from; | |
52 | const char *to; | |
53 | { | |
54 | int fromfd, tofd, nread; | |
55 | int saved; | |
56 | char buf[COPY_BUF]; | |
57 | ||
18226413 | 58 | fromfd = open (from, O_RDONLY | O_BINARY); |
252b5132 RH |
59 | if (fromfd < 0) |
60 | return -1; | |
18226413 ILT |
61 | #ifdef O_CREAT |
62 | tofd = open (to, O_CREAT | O_WRONLY | O_TRUNC | O_BINARY, 0777); | |
63 | #else | |
252b5132 | 64 | tofd = creat (to, 0777); |
18226413 | 65 | #endif |
252b5132 RH |
66 | if (tofd < 0) |
67 | { | |
68 | saved = errno; | |
69 | close (fromfd); | |
70 | errno = saved; | |
71 | return -1; | |
72 | } | |
73 | while ((nread = read (fromfd, buf, sizeof buf)) > 0) | |
74 | { | |
75 | if (write (tofd, buf, nread) != nread) | |
76 | { | |
77 | saved = errno; | |
78 | close (fromfd); | |
79 | close (tofd); | |
80 | errno = saved; | |
81 | return -1; | |
82 | } | |
83 | } | |
84 | saved = errno; | |
85 | close (fromfd); | |
86 | close (tofd); | |
87 | if (nread < 0) | |
88 | { | |
89 | errno = saved; | |
90 | return -1; | |
91 | } | |
92 | return 0; | |
93 | } | |
94 | ||
95 | /* Set the times of the file DESTINATION to be the same as those in | |
96 | STATBUF. */ | |
97 | ||
98 | void | |
99 | set_times (destination, statbuf) | |
100 | const char *destination; | |
101 | const struct stat *statbuf; | |
102 | { | |
103 | int result; | |
104 | ||
105 | { | |
106 | #ifdef HAVE_GOOD_UTIME_H | |
107 | struct utimbuf tb; | |
108 | ||
109 | tb.actime = statbuf->st_atime; | |
110 | tb.modtime = statbuf->st_mtime; | |
111 | result = utime (destination, &tb); | |
112 | #else /* ! HAVE_GOOD_UTIME_H */ | |
113 | #ifndef HAVE_UTIMES | |
114 | long tb[2]; | |
115 | ||
116 | tb[0] = statbuf->st_atime; | |
117 | tb[1] = statbuf->st_mtime; | |
118 | result = utime (destination, tb); | |
119 | #else /* HAVE_UTIMES */ | |
120 | struct timeval tv[2]; | |
121 | ||
122 | tv[0].tv_sec = statbuf->st_atime; | |
123 | tv[0].tv_usec = 0; | |
124 | tv[1].tv_sec = statbuf->st_mtime; | |
125 | tv[1].tv_usec = 0; | |
126 | result = utimes (destination, tv); | |
127 | #endif /* HAVE_UTIMES */ | |
128 | #endif /* ! HAVE_GOOD_UTIME_H */ | |
129 | } | |
130 | ||
131 | if (result != 0) | |
132 | non_fatal (_("%s: cannot set time: %s"), destination, strerror (errno)); | |
133 | } | |
134 | ||
135 | #ifndef S_ISLNK | |
136 | #ifdef S_IFLNK | |
137 | #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK) | |
138 | #else | |
139 | #define S_ISLNK(m) 0 | |
140 | #define lstat stat | |
141 | #endif | |
142 | #endif | |
143 | ||
144 | /* Rename FROM to TO, copying if TO is a link. | |
145 | Return 0 if ok, -1 if error. */ | |
146 | ||
147 | int | |
148 | smart_rename (from, to, preserve_dates) | |
149 | const char *from; | |
150 | const char *to; | |
151 | int preserve_dates; | |
152 | { | |
b34976b6 | 153 | bfd_boolean exists; |
252b5132 RH |
154 | struct stat s; |
155 | int ret = 0; | |
156 | ||
82716b78 | 157 | exists = lstat (to, &s) == 0; |
252b5132 RH |
158 | |
159 | #if defined (_WIN32) && !defined (__CYGWIN32__) | |
160 | /* Win32, unlike unix, will not erase `to' in `rename(from, to)' but | |
161 | fail instead. Also, chown is not present. */ | |
162 | ||
82716b78 | 163 | if (exists) |
252b5132 RH |
164 | remove (to); |
165 | ||
166 | ret = rename (from, to); | |
167 | if (ret != 0) | |
168 | { | |
53c7db4b KH |
169 | /* We have to clean up here. */ |
170 | ||
252b5132 RH |
171 | non_fatal (_("%s: rename: %s"), to, strerror (errno)); |
172 | unlink (from); | |
173 | } | |
174 | #else | |
175 | /* Use rename only if TO is not a symbolic link and has | |
176 | only one hard link. */ | |
82716b78 | 177 | if (! exists || (!S_ISLNK (s.st_mode) && s.st_nlink == 1)) |
252b5132 RH |
178 | { |
179 | ret = rename (from, to); | |
180 | if (ret == 0) | |
181 | { | |
182 | if (exists) | |
183 | { | |
184 | /* Try to preserve the permission bits and ownership of | |
185 | TO. First get the mode right except for the setuid | |
186 | bit. Then change the ownership. Then fix the setuid | |
187 | bit. We do the chmod before the chown because if the | |
188 | chown succeeds, and we are a normal user, we won't be | |
189 | able to do the chmod afterward. We don't bother to | |
190 | fix the setuid bit first because that might introduce | |
191 | a fleeting security problem, and because the chown | |
192 | will clear the setuid bit anyhow. We only fix the | |
193 | setuid bit if the chown succeeds, because we don't | |
194 | want to introduce an unexpected setuid file owned by | |
195 | the user running objcopy. */ | |
196 | chmod (to, s.st_mode & 0777); | |
197 | if (chown (to, s.st_uid, s.st_gid) >= 0) | |
198 | chmod (to, s.st_mode & 07777); | |
199 | } | |
200 | } | |
201 | else | |
202 | { | |
53c7db4b | 203 | /* We have to clean up here. */ |
252b5132 RH |
204 | non_fatal (_("%s: rename: %s"), to, strerror (errno)); |
205 | unlink (from); | |
206 | } | |
207 | } | |
208 | else | |
209 | { | |
210 | ret = simple_copy (from, to); | |
211 | if (ret != 0) | |
212 | non_fatal (_("%s: simple_copy: %s"), to, strerror (errno)); | |
213 | ||
214 | if (preserve_dates) | |
215 | set_times (to, &s); | |
216 | unlink (from); | |
217 | } | |
218 | #endif /* _WIN32 && !__CYGWIN32__ */ | |
219 | ||
220 | return ret; | |
221 | } |