1 /* rename.c -- rename a file, preserving symlinks.
2 Copyright 1999 Free Software Foundation, Inc.
4 This file is part of GNU Binutils.
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.
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.
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
26 #ifdef HAVE_GOOD_UTIME_H
28 #else /* ! HAVE_GOOD_UTIME_H */
31 #endif /* HAVE_UTIMES */
32 #endif /* ! HAVE_GOOD_UTIME_H */
34 /* We need to open the file in binary modes on system where that makes
40 static int simple_copy
PARAMS ((const char *, const char *));
42 /* The number of bytes to copy at once. */
45 /* Copy file FROM to file TO, performing no translations.
46 Return 0 if ok, -1 if error. */
49 simple_copy (from
, to
)
53 int fromfd
, tofd
, nread
;
57 fromfd
= open (from
, O_RDONLY
| O_BINARY
);
61 tofd
= open (to
, O_CREAT
| O_WRONLY
| O_TRUNC
| O_BINARY
, 0777);
63 tofd
= creat (to
, 0777);
72 while ((nread
= read (fromfd
, buf
, sizeof buf
)) > 0)
74 if (write (tofd
, buf
, nread
) != nread
)
94 /* Set the times of the file DESTINATION to be the same as those in
98 set_times (destination
, statbuf
)
99 const char *destination
;
100 const struct stat
*statbuf
;
105 #ifdef HAVE_GOOD_UTIME_H
108 tb
.actime
= statbuf
->st_atime
;
109 tb
.modtime
= statbuf
->st_mtime
;
110 result
= utime (destination
, &tb
);
111 #else /* ! HAVE_GOOD_UTIME_H */
115 tb
[0] = statbuf
->st_atime
;
116 tb
[1] = statbuf
->st_mtime
;
117 result
= utime (destination
, tb
);
118 #else /* HAVE_UTIMES */
119 struct timeval tv
[2];
121 tv
[0].tv_sec
= statbuf
->st_atime
;
123 tv
[1].tv_sec
= statbuf
->st_mtime
;
125 result
= utimes (destination
, tv
);
126 #endif /* HAVE_UTIMES */
127 #endif /* ! HAVE_GOOD_UTIME_H */
131 non_fatal (_("%s: cannot set time: %s"), destination
, strerror (errno
));
136 #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
143 /* Rename FROM to TO, copying if TO is a link.
144 Return 0 if ok, -1 if error. */
147 smart_rename (from
, to
, preserve_dates
)
156 exists
= lstat (to
, &s
) == 0;
158 #if defined (_WIN32) && !defined (__CYGWIN32__)
159 /* Win32, unlike unix, will not erase `to' in `rename(from, to)' but
160 fail instead. Also, chown is not present. */
165 ret
= rename (from
, to
);
168 /* We have to clean up here. */
170 non_fatal (_("%s: rename: %s"), to
, strerror (errno
));
174 /* Use rename only if TO is not a symbolic link and has
175 only one hard link. */
176 if (! exists
|| (!S_ISLNK (s
.st_mode
) && s
.st_nlink
== 1))
178 ret
= rename (from
, to
);
183 /* Try to preserve the permission bits and ownership of
184 TO. First get the mode right except for the setuid
185 bit. Then change the ownership. Then fix the setuid
186 bit. We do the chmod before the chown because if the
187 chown succeeds, and we are a normal user, we won't be
188 able to do the chmod afterward. We don't bother to
189 fix the setuid bit first because that might introduce
190 a fleeting security problem, and because the chown
191 will clear the setuid bit anyhow. We only fix the
192 setuid bit if the chown succeeds, because we don't
193 want to introduce an unexpected setuid file owned by
194 the user running objcopy. */
195 chmod (to
, s
.st_mode
& 0777);
196 if (chown (to
, s
.st_uid
, s
.st_gid
) >= 0)
197 chmod (to
, s
.st_mode
& 07777);
202 /* We have to clean up here. */
203 non_fatal (_("%s: rename: %s"), to
, strerror (errno
));
209 ret
= simple_copy (from
, to
);
211 non_fatal (_("%s: simple_copy: %s"), to
, strerror (errno
));
217 #endif /* _WIN32 && !__CYGWIN32__ */
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