Commit | Line | Data |
---|---|---|
252b5132 | 1 | /* rename.c -- rename a file, preserving symlinks. |
2da42df6 | 2 | Copyright 1999, 2002, 2003 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 | ||
2da42df6 | 40 | static int simple_copy (const char *, const char *); |
252b5132 RH |
41 | |
42 | /* The number of bytes to copy at once. */ | |
43 | #define COPY_BUF 8192 | |
44 | ||
45 | /* Copy file FROM to file TO, performing no translations. | |
46 | Return 0 if ok, -1 if error. */ | |
47 | ||
48 | static int | |
2da42df6 | 49 | simple_copy (const char *from, const char *to) |
252b5132 RH |
50 | { |
51 | int fromfd, tofd, nread; | |
52 | int saved; | |
53 | char buf[COPY_BUF]; | |
54 | ||
18226413 | 55 | fromfd = open (from, O_RDONLY | O_BINARY); |
252b5132 RH |
56 | if (fromfd < 0) |
57 | return -1; | |
18226413 ILT |
58 | #ifdef O_CREAT |
59 | tofd = open (to, O_CREAT | O_WRONLY | O_TRUNC | O_BINARY, 0777); | |
60 | #else | |
252b5132 | 61 | tofd = creat (to, 0777); |
18226413 | 62 | #endif |
252b5132 RH |
63 | if (tofd < 0) |
64 | { | |
65 | saved = errno; | |
66 | close (fromfd); | |
67 | errno = saved; | |
68 | return -1; | |
69 | } | |
70 | while ((nread = read (fromfd, buf, sizeof buf)) > 0) | |
71 | { | |
72 | if (write (tofd, buf, nread) != nread) | |
73 | { | |
74 | saved = errno; | |
75 | close (fromfd); | |
76 | close (tofd); | |
77 | errno = saved; | |
78 | return -1; | |
79 | } | |
80 | } | |
81 | saved = errno; | |
82 | close (fromfd); | |
83 | close (tofd); | |
84 | if (nread < 0) | |
85 | { | |
86 | errno = saved; | |
87 | return -1; | |
88 | } | |
89 | return 0; | |
90 | } | |
91 | ||
92 | /* Set the times of the file DESTINATION to be the same as those in | |
93 | STATBUF. */ | |
94 | ||
95 | void | |
2da42df6 | 96 | set_times (const char *destination, const struct stat *statbuf) |
252b5132 RH |
97 | { |
98 | int result; | |
99 | ||
100 | { | |
101 | #ifdef HAVE_GOOD_UTIME_H | |
102 | struct utimbuf tb; | |
103 | ||
104 | tb.actime = statbuf->st_atime; | |
105 | tb.modtime = statbuf->st_mtime; | |
106 | result = utime (destination, &tb); | |
107 | #else /* ! HAVE_GOOD_UTIME_H */ | |
108 | #ifndef HAVE_UTIMES | |
109 | long tb[2]; | |
110 | ||
111 | tb[0] = statbuf->st_atime; | |
112 | tb[1] = statbuf->st_mtime; | |
113 | result = utime (destination, tb); | |
114 | #else /* HAVE_UTIMES */ | |
115 | struct timeval tv[2]; | |
116 | ||
117 | tv[0].tv_sec = statbuf->st_atime; | |
118 | tv[0].tv_usec = 0; | |
119 | tv[1].tv_sec = statbuf->st_mtime; | |
120 | tv[1].tv_usec = 0; | |
121 | result = utimes (destination, tv); | |
122 | #endif /* HAVE_UTIMES */ | |
123 | #endif /* ! HAVE_GOOD_UTIME_H */ | |
124 | } | |
125 | ||
126 | if (result != 0) | |
127 | non_fatal (_("%s: cannot set time: %s"), destination, strerror (errno)); | |
128 | } | |
129 | ||
130 | #ifndef S_ISLNK | |
131 | #ifdef S_IFLNK | |
132 | #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK) | |
133 | #else | |
134 | #define S_ISLNK(m) 0 | |
135 | #define lstat stat | |
136 | #endif | |
137 | #endif | |
138 | ||
139 | /* Rename FROM to TO, copying if TO is a link. | |
140 | Return 0 if ok, -1 if error. */ | |
141 | ||
142 | int | |
2da42df6 | 143 | smart_rename (const char *from, const char *to, int preserve_dates) |
252b5132 | 144 | { |
b34976b6 | 145 | bfd_boolean exists; |
252b5132 RH |
146 | struct stat s; |
147 | int ret = 0; | |
148 | ||
82716b78 | 149 | exists = lstat (to, &s) == 0; |
252b5132 RH |
150 | |
151 | #if defined (_WIN32) && !defined (__CYGWIN32__) | |
152 | /* Win32, unlike unix, will not erase `to' in `rename(from, to)' but | |
153 | fail instead. Also, chown is not present. */ | |
154 | ||
82716b78 | 155 | if (exists) |
252b5132 RH |
156 | remove (to); |
157 | ||
158 | ret = rename (from, to); | |
159 | if (ret != 0) | |
160 | { | |
53c7db4b | 161 | /* We have to clean up here. */ |
195f52b5 | 162 | non_fatal (_("unable to rename '%s' reason: %s"), to, strerror (errno)); |
252b5132 RH |
163 | unlink (from); |
164 | } | |
165 | #else | |
166 | /* Use rename only if TO is not a symbolic link and has | |
195f52b5 NC |
167 | only one hard link, and we have permission to write to it. */ |
168 | if (! exists | |
169 | || (!S_ISLNK (s.st_mode) | |
170 | && S_ISREG (s.st_mode) | |
171 | && (s.st_mode & S_IWUSR) | |
172 | && s.st_nlink == 1) | |
173 | ) | |
252b5132 RH |
174 | { |
175 | ret = rename (from, to); | |
176 | if (ret == 0) | |
177 | { | |
178 | if (exists) | |
179 | { | |
180 | /* Try to preserve the permission bits and ownership of | |
181 | TO. First get the mode right except for the setuid | |
182 | bit. Then change the ownership. Then fix the setuid | |
183 | bit. We do the chmod before the chown because if the | |
184 | chown succeeds, and we are a normal user, we won't be | |
185 | able to do the chmod afterward. We don't bother to | |
186 | fix the setuid bit first because that might introduce | |
187 | a fleeting security problem, and because the chown | |
188 | will clear the setuid bit anyhow. We only fix the | |
189 | setuid bit if the chown succeeds, because we don't | |
190 | want to introduce an unexpected setuid file owned by | |
191 | the user running objcopy. */ | |
192 | chmod (to, s.st_mode & 0777); | |
193 | if (chown (to, s.st_uid, s.st_gid) >= 0) | |
194 | chmod (to, s.st_mode & 07777); | |
195 | } | |
196 | } | |
197 | else | |
198 | { | |
53c7db4b | 199 | /* We have to clean up here. */ |
195f52b5 | 200 | non_fatal (_("unable to rename '%s' reason: %s"), to, strerror (errno)); |
252b5132 RH |
201 | unlink (from); |
202 | } | |
203 | } | |
204 | else | |
205 | { | |
206 | ret = simple_copy (from, to); | |
207 | if (ret != 0) | |
195f52b5 | 208 | non_fatal (_("unable to copy file '%s' reason: %s"), to, strerror (errno)); |
252b5132 RH |
209 | |
210 | if (preserve_dates) | |
211 | set_times (to, &s); | |
212 | unlink (from); | |
213 | } | |
214 | #endif /* _WIN32 && !__CYGWIN32__ */ | |
215 | ||
216 | return ret; | |
217 | } |