Nios® II Software Developer Handbook

ID 683525
Date 8/28/2023
Public
Document Table of Contents

15.1.59. close()

Prototype

int close (int fd)

Commonly Called By

C/C++ programs

Device drivers

Thread-safe

See description.

Available from ISR

No.

Include

<unistd.h>

Description

The close() function is the standard UNIX-style close() function, which closes the file descriptor fd.

Calls to close() are thread-safe only if the implementation of close() provided by the driver that is manipulated is thread-safe.

Valid values for the fd parameter are: stdout, stdin, and stderr, or any value returned from a call to open().

Return

The return value is zero on success, and –1 otherwise. If an error occurs, errno is set to indicate the cause.