sockfd_lookup
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## Name

sockfd_lookup — Go from a file number to its socket slot

## Synopsis

`struct socket * sockfd_lookup (` | int fd,
| int * err`)`;

## Arguments

`fd`

  file handle

`err`

  pointer to an error code return

## Description

The file handle passed in is locked and the socket it is bound too is returned. If an error occurs the err pointer is overwritten with a negative errno code and NULL is returned. The function checks for both invalid handles and passing a handle which is not a socket.

On a success the socket object pointer is returned.

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