Commit | Line | Data |
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252b5132 | 1 | /* rename.c -- rename a file, preserving symlinks. |
aa820537 | 2 | Copyright 1999, 2002, 2003, 2005, 2007, 2008 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 | |
32866df7 | 8 | the Free Software Foundation; either version 3 of the License, or |
252b5132 RH |
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 | |
b43b5d5f NC |
18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA |
19 | 02110-1301, USA. */ | |
252b5132 | 20 | |
3db64b00 | 21 | #include "sysdep.h" |
252b5132 RH |
22 | #include "bfd.h" |
23 | #include "bucomm.h" | |
24 | ||
25 | #include <sys/stat.h> | |
26 | ||
27 | #ifdef HAVE_GOOD_UTIME_H | |
28 | #include <utime.h> | |
29 | #else /* ! HAVE_GOOD_UTIME_H */ | |
30 | #ifdef HAVE_UTIMES | |
31 | #include <sys/time.h> | |
32 | #endif /* HAVE_UTIMES */ | |
33 | #endif /* ! HAVE_GOOD_UTIME_H */ | |
34 | ||
cbee2975 | 35 | #if ! defined (_WIN32) || defined (__CYGWIN32__) |
2da42df6 | 36 | static int simple_copy (const char *, const char *); |
252b5132 RH |
37 | |
38 | /* The number of bytes to copy at once. */ | |
39 | #define COPY_BUF 8192 | |
40 | ||
41 | /* Copy file FROM to file TO, performing no translations. | |
42 | Return 0 if ok, -1 if error. */ | |
43 | ||
44 | static int | |
2da42df6 | 45 | simple_copy (const char *from, const char *to) |
252b5132 RH |
46 | { |
47 | int fromfd, tofd, nread; | |
48 | int saved; | |
49 | char buf[COPY_BUF]; | |
50 | ||
18226413 | 51 | fromfd = open (from, O_RDONLY | O_BINARY); |
252b5132 RH |
52 | if (fromfd < 0) |
53 | return -1; | |
18226413 ILT |
54 | #ifdef O_CREAT |
55 | tofd = open (to, O_CREAT | O_WRONLY | O_TRUNC | O_BINARY, 0777); | |
56 | #else | |
252b5132 | 57 | tofd = creat (to, 0777); |
18226413 | 58 | #endif |
252b5132 RH |
59 | if (tofd < 0) |
60 | { | |
61 | saved = errno; | |
62 | close (fromfd); | |
63 | errno = saved; | |
64 | return -1; | |
65 | } | |
66 | while ((nread = read (fromfd, buf, sizeof buf)) > 0) | |
67 | { | |
68 | if (write (tofd, buf, nread) != nread) | |
69 | { | |
70 | saved = errno; | |
71 | close (fromfd); | |
72 | close (tofd); | |
73 | errno = saved; | |
74 | return -1; | |
75 | } | |
76 | } | |
77 | saved = errno; | |
78 | close (fromfd); | |
79 | close (tofd); | |
80 | if (nread < 0) | |
81 | { | |
82 | errno = saved; | |
83 | return -1; | |
84 | } | |
85 | return 0; | |
86 | } | |
cbee2975 | 87 | #endif /* __CYGWIN32__ or not _WIN32 */ |
252b5132 RH |
88 | |
89 | /* Set the times of the file DESTINATION to be the same as those in | |
90 | STATBUF. */ | |
91 | ||
92 | void | |
2da42df6 | 93 | set_times (const char *destination, const struct stat *statbuf) |
252b5132 RH |
94 | { |
95 | int result; | |
96 | ||
97 | { | |
98 | #ifdef HAVE_GOOD_UTIME_H | |
99 | struct utimbuf tb; | |
100 | ||
101 | tb.actime = statbuf->st_atime; | |
102 | tb.modtime = statbuf->st_mtime; | |
103 | result = utime (destination, &tb); | |
104 | #else /* ! HAVE_GOOD_UTIME_H */ | |
105 | #ifndef HAVE_UTIMES | |
106 | long tb[2]; | |
107 | ||
108 | tb[0] = statbuf->st_atime; | |
109 | tb[1] = statbuf->st_mtime; | |
110 | result = utime (destination, tb); | |
111 | #else /* HAVE_UTIMES */ | |
112 | struct timeval tv[2]; | |
113 | ||
114 | tv[0].tv_sec = statbuf->st_atime; | |
115 | tv[0].tv_usec = 0; | |
116 | tv[1].tv_sec = statbuf->st_mtime; | |
117 | tv[1].tv_usec = 0; | |
118 | result = utimes (destination, tv); | |
119 | #endif /* HAVE_UTIMES */ | |
120 | #endif /* ! HAVE_GOOD_UTIME_H */ | |
121 | } | |
122 | ||
123 | if (result != 0) | |
124 | non_fatal (_("%s: cannot set time: %s"), destination, strerror (errno)); | |
125 | } | |
126 | ||
127 | #ifndef S_ISLNK | |
128 | #ifdef S_IFLNK | |
129 | #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK) | |
130 | #else | |
131 | #define S_ISLNK(m) 0 | |
132 | #define lstat stat | |
133 | #endif | |
134 | #endif | |
135 | ||
136 | /* Rename FROM to TO, copying if TO is a link. | |
137 | Return 0 if ok, -1 if error. */ | |
138 | ||
139 | int | |
cbee2975 | 140 | smart_rename (const char *from, const char *to, int preserve_dates ATTRIBUTE_UNUSED) |
252b5132 | 141 | { |
b34976b6 | 142 | bfd_boolean exists; |
252b5132 RH |
143 | struct stat s; |
144 | int ret = 0; | |
145 | ||
82716b78 | 146 | exists = lstat (to, &s) == 0; |
252b5132 RH |
147 | |
148 | #if defined (_WIN32) && !defined (__CYGWIN32__) | |
149 | /* Win32, unlike unix, will not erase `to' in `rename(from, to)' but | |
150 | fail instead. Also, chown is not present. */ | |
151 | ||
82716b78 | 152 | if (exists) |
252b5132 RH |
153 | remove (to); |
154 | ||
155 | ret = rename (from, to); | |
156 | if (ret != 0) | |
157 | { | |
53c7db4b | 158 | /* We have to clean up here. */ |
216ff8b4 | 159 | non_fatal (_("unable to rename '%s'; reason: %s"), to, strerror (errno)); |
252b5132 RH |
160 | unlink (from); |
161 | } | |
162 | #else | |
163 | /* Use rename only if TO is not a symbolic link and has | |
195f52b5 NC |
164 | only one hard link, and we have permission to write to it. */ |
165 | if (! exists | |
166 | || (!S_ISLNK (s.st_mode) | |
167 | && S_ISREG (s.st_mode) | |
168 | && (s.st_mode & S_IWUSR) | |
169 | && s.st_nlink == 1) | |
170 | ) | |
252b5132 RH |
171 | { |
172 | ret = rename (from, to); | |
173 | if (ret == 0) | |
174 | { | |
175 | if (exists) | |
176 | { | |
177 | /* Try to preserve the permission bits and ownership of | |
178 | TO. First get the mode right except for the setuid | |
179 | bit. Then change the ownership. Then fix the setuid | |
180 | bit. We do the chmod before the chown because if the | |
181 | chown succeeds, and we are a normal user, we won't be | |
182 | able to do the chmod afterward. We don't bother to | |
183 | fix the setuid bit first because that might introduce | |
184 | a fleeting security problem, and because the chown | |
185 | will clear the setuid bit anyhow. We only fix the | |
186 | setuid bit if the chown succeeds, because we don't | |
187 | want to introduce an unexpected setuid file owned by | |
188 | the user running objcopy. */ | |
189 | chmod (to, s.st_mode & 0777); | |
190 | if (chown (to, s.st_uid, s.st_gid) >= 0) | |
191 | chmod (to, s.st_mode & 07777); | |
192 | } | |
193 | } | |
194 | else | |
195 | { | |
53c7db4b | 196 | /* We have to clean up here. */ |
216ff8b4 | 197 | non_fatal (_("unable to rename '%s'; reason: %s"), to, strerror (errno)); |
252b5132 RH |
198 | unlink (from); |
199 | } | |
200 | } | |
201 | else | |
202 | { | |
203 | ret = simple_copy (from, to); | |
204 | if (ret != 0) | |
216ff8b4 | 205 | non_fatal (_("unable to copy file '%s'; reason: %s"), to, strerror (errno)); |
252b5132 RH |
206 | |
207 | if (preserve_dates) | |
208 | set_times (to, &s); | |
209 | unlink (from); | |
210 | } | |
211 | #endif /* _WIN32 && !__CYGWIN32__ */ | |
212 | ||
213 | return ret; | |
214 | } |