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