fileno#

Synopsis#

#include <stdio.h>

int fileno(FILE *stream);

Status#

Partially implemented

Conformance#

IEEE Std 1003.1-2017

Description#

The fileno() function maps a stream pointer to a file descriptor associated with the stream pointed to by stream.

Return value#

Upon successful completion, fileno() shall return the integer value of the file descriptor associated with stream. Otherwise, the value -1 shall be returned and errno set to indicate the error.

Errors#

The fileno() function shall fail if:

  • EBADF - The stream is not associated with a file.

The fileno() function may fail if:

  • EBADF - The file descriptor underlying stream is not a valid file descriptor.

Tests#

Untested

Known bugs#

None

See Also#

  1. Standard library functions

  2. Table of Contents