1 /* rename.c -- rename a file, preserving symlinks.
2 Copyright 1999, 2002, 2003 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 (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 (const char *from
, const char *to
)
51 int fromfd
, tofd
, nread
;
55 fromfd
= open (from
, O_RDONLY
| O_BINARY
);
59 tofd
= open (to
, O_CREAT
| O_WRONLY
| O_TRUNC
| O_BINARY
, 0777);
61 tofd
= creat (to
, 0777);
70 while ((nread
= read (fromfd
, buf
, sizeof buf
)) > 0)
72 if (write (tofd
, buf
, nread
) != nread
)
92 /* Set the times of the file DESTINATION to be the same as those in
96 set_times (const char *destination
, const struct stat
*statbuf
)
101 #ifdef HAVE_GOOD_UTIME_H
104 tb
.actime
= statbuf
->st_atime
;
105 tb
.modtime
= statbuf
->st_mtime
;
106 result
= utime (destination
, &tb
);
107 #else /* ! HAVE_GOOD_UTIME_H */
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];
117 tv
[0].tv_sec
= statbuf
->st_atime
;
119 tv
[1].tv_sec
= statbuf
->st_mtime
;
121 result
= utimes (destination
, tv
);
122 #endif /* HAVE_UTIMES */
123 #endif /* ! HAVE_GOOD_UTIME_H */
127 non_fatal (_("%s: cannot set time: %s"), destination
, strerror (errno
));
132 #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
139 /* Rename FROM to TO, copying if TO is a link.
140 Return 0 if ok, -1 if error. */
143 smart_rename (const char *from
, const char *to
, int preserve_dates
)
149 exists
= lstat (to
, &s
) == 0;
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. */
158 ret
= rename (from
, to
);
161 /* We have to clean up here. */
163 non_fatal (_("%s: rename: %s"), to
, strerror (errno
));
167 /* Use rename only if TO is not a symbolic link and has
168 only one hard link. */
169 if (! exists
|| (!S_ISLNK (s
.st_mode
) && s
.st_nlink
== 1))
171 ret
= rename (from
, to
);
176 /* Try to preserve the permission bits and ownership of
177 TO. First get the mode right except for the setuid
178 bit. Then change the ownership. Then fix the setuid
179 bit. We do the chmod before the chown because if the
180 chown succeeds, and we are a normal user, we won't be
181 able to do the chmod afterward. We don't bother to
182 fix the setuid bit first because that might introduce
183 a fleeting security problem, and because the chown
184 will clear the setuid bit anyhow. We only fix the
185 setuid bit if the chown succeeds, because we don't
186 want to introduce an unexpected setuid file owned by
187 the user running objcopy. */
188 chmod (to
, s
.st_mode
& 0777);
189 if (chown (to
, s
.st_uid
, s
.st_gid
) >= 0)
190 chmod (to
, s
.st_mode
& 07777);
195 /* We have to clean up here. */
196 non_fatal (_("%s: rename: %s"), to
, strerror (errno
));
202 ret
= simple_copy (from
, to
);
204 non_fatal (_("%s: simple_copy: %s"), to
, strerror (errno
));
210 #endif /* _WIN32 && !__CYGWIN32__ */
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