# node:os

> How Elide supports Node's `os` module: it matches Node, except that `cpus()` reports each core's model and speed with every `times` field set to zero.

`node:os` matches [Node's `os`](https://nodejs.org/api/os.html).

## Example

```js
// os.mjs
import os from "node:os";

console.log(JSON.stringify(os.EOL), os.devNull);
console.log(os.constants.signals.SIGTERM, os.constants.errno.ENOENT);
console.log(os.availableParallelism() > 0, os.cpus().length > 0);
console.log(typeof os.totalmem(), typeof os.homedir(), os.endianness());
```

`elide run os.mjs` prints:

```text
"\n" /dev/null
15 2
true true
number string LE
```

## Differences from Node

- `cpus()` reports each core's model and speed; every `times` field is zero.

<!-- api-reference:start 2dc4febf64c9 -->
## Reference

**Status:** Full · Not measured · since 1.1.0

### Exports

| Export | Kind | Status | Notes |
| --- | --- | --- | --- |
| `arch()` | function | Full | Returns the CPU architecture of the process (e.g. "x64", "arm64") |
| `cpus()` | function | Full | Returns an array of objects describing each logical CPU core |
| `endianness()` | function | Full | Returns the endianness of the CPU: "BE" (big-endian) or "LE" (little-endian) |
| `freemem()` | function | Full | Returns the amount of free system memory in bytes |
| `homedir()` | function | Full | Returns the current user's home directory path |
| `hostname()` | function | Full | Returns the host name of the operating system |
| `loadavg()` | function | Full | Returns the 1, 5, and 15-minute system load averages |
| `networkInterfaces()` | function | Full | Returns an object mapping interface names to their address entries |
| `platform()` | function | Full | Returns the operating system platform (e.g. "linux", "darwin", "win32") |
| `release()` | function | Full | Returns the OS release version string |
| `tmpdir()` | function | Full | Returns the operating system's default directory for temporary files |
| `totalmem()` | function | Full | Returns the total amount of system memory in bytes |
| `type()` | function | Full | Returns the OS name (e.g. "Linux", "Darwin", "Windows_NT") |
| `uptime()` | function | Full | Returns the system uptime in seconds |
| `userInfo()` | function | Full | Returns information about the currently effective user |
| `machine()` | function | Full | Returns the machine type as a string, such as "arm64", "x86_64", etc |
| `version()` | function | Full | Returns the operating system kernel version string |
| `availableParallelism()` | function | Full | Returns an estimate of the default amount of parallelism a program should use, respecting cgroups and CPU… |
| `getPriority()` | function | Full | Returns the scheduling priority for the process specified by pid |
| `setPriority()` | function | Full | Sets the scheduling priority for the process specified by pid |
| `EOL` | property | Full | The operating system end-of-line character sequence (`\n` on POSIX, `\r\n` on Windows) |
| `devNull` | property | Full | The null device path (`/dev/null` on POSIX, `\\.\nul` on Windows) |
| `constants` | property | Full | Object containing signal, errno, dlopen, and priority constants |
| `os.constants.signals` | constant | Full | `SIGHUP`, `SIGINT`, `SIGQUIT`, `SIGILL`, `SIGTRAP`, `SIGABRT` and 27 more |
| `os.constants.errno` | constant | Full | `EPERM`, `ENOENT`, `ESRCH`, `EINTR`, `EIO`, `ENXIO` and 81 more |
| `os.constants.dlopen` | constant | Full | `RTLD_LAZY`, `RTLD_NOW`, `RTLD_GLOBAL`, `RTLD_LOCAL`, `RTLD_DEEPBIND` |
| `os.constants.priority` | constant | Full | `PRIORITY_LOW`, `PRIORITY_BELOW_NORMAL`, `PRIORITY_NORMAL`, `PRIORITY_ABOVE_NORMAL`, `PRIORITY_HIGH`, `PRIORITY_HIGHEST` |
| `os.constants` | constant | Full | `UV_UDP_REUSEADDR` |
<!-- api-reference:end -->