About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

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Close

Close a file descriptor.

Installation

npm install @stdlib/fs-close

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

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;

/* Sync */

var 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.' );
    }
}

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See Also

• @stdlib/fs-exists: test whether a path exists on the filesystem.
• @stdlib/fs-open: open a file.
• @stdlib/fs-read-file: read the entire contents of a file.

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Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.