Instructions for using the fs.lchmod method in node.js_node.js

Method description:

Change file permissions (does not resolve symbolic links).

Grammar:

Copy code The code is as follows:

fs.lchmod(fd, mode, [callback(err)])

Since this method belongs to the fs module, the fs module needs to be introduced before use (var fs= require(“fs”) )

Receive parameters:

fd File descriptor

mode file permissions

callback callback, passing the exception parameter err

Example:

Copy code The code is as follows:

fs.open('content.txt', 'a', function (err, fd) {
if (err) {
Throw err;
}
fs.lchmod(fd, 0777, function(err){
if (err) {
           throw err;
}
console.log('fchmod complete');
fs.close(fd, function () {
console.log('Done');
});
})
});

Source code:

Copy code The code is as follows:

fs.lchmod = function(path, mode, callback) {
​ callback = maybeCallback(callback);
fs.open(path, constants.O_WRONLY | constants.O_SYMLINK, function(err, fd) {
If (err) {
        callback(err);
         return;
}
// prefer to return the chmod error, if one occurs,
// but still try to close, and report closing errors if they occur.
fs.fchmod(fd, mode, function(err) {
             fs.close(fd, function(err2) {
            callback(err || err2);
        });
});
});
};