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

Method description:

Sync disk cache.

Grammar:

Copy code The code is as follows:

fs.fsync(fd, [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

callback Callback, passing an exception parameter err

Example:

Copy code The code is as follows:

var fs = require('fs');
fs.open('content.txt', 'a', function(err,fd){
if(err){
throw err;
}
console.log('file open');
fs.fsync(fd, function(err){
if(err){
throw err;
}
console.log('done');
fs.close(fd,function(err){
if(err){
Throw err;
}
console.log('file closed');
})
})
})

Source code:

Copy code The code is as follows:

fs.fsync(fd, callback)fs.fsync = function(fd, callback) {
binding.fsync(fd, makeCallback(callback));
};