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/*
* Copyright (c) 2008-2010 Wind River Systems; see
* guts/COPYRIGHT for information.
*
* static int
* wrap_rename(const char *oldpath, const char *newpath) {
* int rc = -1;
*/
pseudo_msg_t *msg;
struct stat64 oldbuf, newbuf;
int oldrc, newrc;
int save_errno;
pseudo_debug(2, "rename: %s->%s\n",
oldpath ? oldpath : "<nil>",
newpath ? newpath : "<nil>");
if (!oldpath || !newpath) {
errno = EFAULT;
return -1;
}
save_errno = errno;
newrc = real___lxstat64(_STAT_VER, newpath, &newbuf);
oldrc = real___lxstat64(_STAT_VER, oldpath, &oldbuf);
errno = save_errno;
/* newpath must be removed. */
/* as with unlink, we have to do the remove before the operation
*/
msg = pseudo_client_op(OP_UNLINK, 0, -1, -1, newpath, newrc ? NULL : &newbuf);
/* stash the server's old data */
rc = real_rename(oldpath, newpath);
save_errno = errno;
if (rc == -1) {
if (msg && msg->result == RESULT_SUCCEED) {
newbuf.st_uid = msg->uid;
newbuf.st_gid = msg->uid;
newbuf.st_mode = msg->mode;
newbuf.st_dev = msg->dev;
newbuf.st_ino = msg->ino;
/* since we failed, that wasn't really unlinked -- put
* it back.
*/
pseudo_client_op(OP_LINK, 0, -1, -1, newpath, &newbuf);
}
/* and we're done. */
errno = save_errno;
return rc;
}
save_errno = errno;
/* nothing to do for a "rename" of a link to itself */
if (newrc != -1 && oldrc != -1 &&
newbuf.st_dev == oldbuf.st_dev &&
newbuf.st_ino == oldbuf.st_ino) {
return rc;
}
/* rename(3) is not mv(1). rename(file, dir) fails; you must provide
* the corrected path yourself. You can rename over a directory only
* if the source is a directory. Symlinks are simply removed.
*
* If we got here, the real rename call succeeded. That means newpath
* has been unlinked and oldpath has been linked to it.
*
* There are a ton of special cases to error check. I don't check
* for any of them, because in every such case, the underlying rename
* failed, and there is nothing to do.
* The only tricky part is that, because we used to ignore symlinks,
* we may have to rename or remove directory trees even though in
* theory rename can never destroy a directory tree.
*/
/* re-stat the new file. Why? Because if something got moved
* across device boundaries, its dev/ino changed!
*/
newrc = real___lxstat64(_STAT_VER, newpath, &newbuf);
if (msg && msg->result == RESULT_SUCCEED) {
pseudo_stat_msg(&oldbuf, msg);
if (newrc == 0) {
if (newbuf.st_dev != oldbuf.st_dev) {
oldbuf.st_dev = newbuf.st_dev;
oldbuf.st_ino = newbuf.st_ino;
}
}
pseudo_debug(1, "renaming %s, got old mode of 0%o\n", oldpath, (int) msg->mode);
} else {
/* create an entry under the old name, which will then be
* renamed; this way, children would get renamed too, if there
* were any.
*/
if (newrc == 0) {
if (newbuf.st_dev != oldbuf.st_dev) {
oldbuf.st_dev = newbuf.st_dev;
oldbuf.st_ino = newbuf.st_ino;
}
}
pseudo_debug(1, "creating new '%s' [%llu] to rename\n",
oldpath, (unsigned long long) oldbuf.st_ino);
pseudo_client_op(OP_LINK, 0, -1, -1, oldpath, &oldbuf);
}
pseudo_client_op(OP_RENAME, 0, -1, -1, newpath, &oldbuf, oldpath);
errno = save_errno;
/* return rc;
* }
*/
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