Close

Close a file descriptor.

Usage

var close = require( '@stdlib/fs/close' );

close( fd, clbk )

Asynchronously closes a file descriptor, so that the file descriptor no longer refers to any file and may be reused.

var openSync = require( '@stdlib/fs/open' ).sync;

var fd = openSync( __filename );
close( fd, done );

function done( error ) {
    if ( error ) {
        throw error;
    }
}

close.sync( fd )

Synchronously closes a file descriptor.

var openSync = require( '@stdlib/fs/open' ).sync;

var fd = openSync( __filename );

var err = close.sync( fd );
if ( err instanceof Error ) {
    throw err;
}

Notes

The difference between this API and fs.closSync() is that fs.closeSync() will throw if an error is encountered (e.g., if given an invalid file descriptor) and this API will return an error.

Examples

var join = require( 'path' ).join;
var openSync = require( '@stdlib/fs/open' ).sync;
var close = require( '@stdlib/fs/close' );

var err;
var fd;

/* Sync */

fd = openSync( join( __dirname, 'package.json' ), 'r+' );
if ( fd instanceof Error ) {
    console.error( fd.message );
} else {
    err = close.sync( fd );
    // returns undefined

    if ( err instanceof Error ) {
        console.error( err.message );
    } else {
        console.log( 'Synchronously closed file descriptor.' );
    }
}

/* Async */

fd = openSync( join( __dirname, 'package.json' ), 'r+' );
if ( fd instanceof Error ) {
    console.error( fd.message );
} else {
    close( fd, done );
}

function done( error ) {
    if ( error ) {
        console.error( error.message );
    } else {
        console.log( 'Asynchronously closed file descriptor.' );
    }
}