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## Name
isatty - check if a file descriptor is a TTY
## Synopsis
```**c++
#include <unistd.h>
int isatty(int fd);
```
## Description
Checks if the device inside a given file descriptor is a TTY device.
## Return value
If `fd` refers to a TTY device, returns 1. Otherwise, returns 0 and `errno` is set to describe the error.
## Errors
* `EBADF`: `fd` is not an open file descriptor.
* `ENOTTY`: `fd` refers to something that's not a TTY device.
* `EINVAL`: `fd` refers to something that supports `ioctl()`, but is still not a TTY device.
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