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Base: Add man page for posix_openpt(3)

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Andreas Kling 2020-02-07 22:37:27 +01:00
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## Name
posix\_openpt - open a pseudo-terminal device
## Synopsis
```**c++
#include <stdlib.h>
#include <fcntl.h>
int posix_openpt(int flags);
```
## Description
Open a pseudo-terminal master using the given *flags*.
The *flags* argument accepts a bitmask of the following flags:
* `O_RDWR`: Open for both reading and writing.
* `O_NOCTTY`: The opened pseudo-terminal will not be made the controlling TTY for the process.
* `O_CLOEXEC`: The opened fd shall be closed on [`exec`(2)](../man2/exec.md).
## Return value
On success, a pseudo-terminal device is allocated and `posix_openpt()` returns a file descriptor for it. Otherwise, it returns -1 and sets `errno` to describe the error.
## Errors
Returns the same errors as [`open`(2)](../man2/open.md).
## See also
* [`open`(2)](../man2/open.md)