/** Permission checks to access file */
private void checkAccess(UnixPath file, boolean checkRead, boolean checkWrite) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
if (checkRead) file.checkRead();
if (checkWrite) file.checkWrite();
sm.checkPermission(new RuntimePermission("accessUserInformation"));
}
}
@Override
public void setTimes(FileTime lastModifiedTime, FileTime lastAccessTime, FileTime createTime)
throws IOException {
// null => don't change
if (lastModifiedTime == null && lastAccessTime == null) {
// no effect
return;
}
// permission check
file.checkWrite();
int fd = file.openForAttributeAccess(followLinks);
try {
// if not changing both attributes then need existing attributes
if (lastModifiedTime == null || lastAccessTime == null) {
try {
UnixFileAttributes attrs = UnixFileAttributes.get(fd);
if (lastModifiedTime == null) lastModifiedTime = attrs.lastModifiedTime();
if (lastAccessTime == null) lastAccessTime = attrs.lastAccessTime();
} catch (UnixException x) {
x.rethrowAsIOException(file);
}
}
// uptime times
long modValue = lastModifiedTime.to(TimeUnit.MICROSECONDS);
long accessValue = lastAccessTime.to(TimeUnit.MICROSECONDS);
boolean retry = false;
try {
futimes(fd, accessValue, modValue);
} catch (UnixException x) {
// if futimes fails with EINVAL and one/both of the times is
// negative then we adjust the value to the epoch and retry.
if (x.errno() == UnixConstants.EINVAL && (modValue < 0L || accessValue < 0L)) {
retry = true;
} else {
x.rethrowAsIOException(file);
}
}
if (retry) {
if (modValue < 0L) modValue = 0L;
if (accessValue < 0L) accessValue = 0L;
try {
futimes(fd, accessValue, modValue);
} catch (UnixException x) {
x.rethrowAsIOException(file);
}
}
} finally {
close(fd);
}
}