1 /* rename.c -- rename a file, preserving symlinks.
2 Copyright 1999, 2002 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
41 PARAMS ((const char *, const char *));
43 /* The number of bytes to copy at once. */
46 /* Copy file FROM to file TO, performing no translations.
47 Return 0 if ok, -1 if error. */
50 simple_copy (from
, to
)
54 int fromfd
, tofd
, nread
;
58 fromfd
= open (from
, O_RDONLY
| O_BINARY
);
62 tofd
= open (to
, O_CREAT
| O_WRONLY
| O_TRUNC
| O_BINARY
, 0777);
64 tofd
= creat (to
, 0777);
73 while ((nread
= read (fromfd
, buf
, sizeof buf
)) > 0)
75 if (write (tofd
, buf
, nread
) != nread
)
95 /* Set the times of the file DESTINATION to be the same as those in
99 set_times (destination
, statbuf
)
100 const char *destination
;
101 const struct stat
*statbuf
;
106 #ifdef HAVE_GOOD_UTIME_H
109 tb
.actime
= statbuf
->st_atime
;
110 tb
.modtime
= statbuf
->st_mtime
;
111 result
= utime (destination
, &tb
);
112 #else /* ! HAVE_GOOD_UTIME_H */
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];
122 tv
[0].tv_sec
= statbuf
->st_atime
;
124 tv
[1].tv_sec
= statbuf
->st_mtime
;
126 result
= utimes (destination
, tv
);
127 #endif /* HAVE_UTIMES */
128 #endif /* ! HAVE_GOOD_UTIME_H */
132 non_fatal (_("%s: cannot set time: %s"), destination
, strerror (errno
));
137 #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
144 /* Rename FROM to TO, copying if TO is a link.
145 Return 0 if ok, -1 if error. */
148 smart_rename (from
, to
, preserve_dates
)
157 exists
= lstat (to
, &s
) == 0;
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. */
166 ret
= rename (from
, to
);
169 /* We have to clean up here. */
171 non_fatal (_("%s: rename: %s"), to
, strerror (errno
));
175 /* Use rename only if TO is not a symbolic link and has
176 only one hard link. */
177 if (! exists
|| (!S_ISLNK (s
.st_mode
) && s
.st_nlink
== 1))
179 ret
= rename (from
, to
);
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);
203 /* We have to clean up here. */
204 non_fatal (_("%s: rename: %s"), to
, strerror (errno
));
210 ret
= simple_copy (from
, to
);
212 non_fatal (_("%s: simple_copy: %s"), to
, strerror (errno
));
218 #endif /* _WIN32 && !__CYGWIN32__ */
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