3.90 fileno

Function

Return the file handle used by a stream.

Header

stdio.h

Declaration

int __fastcall__ fileno (FILE* f);

Description

The fileno function returns the file handle used internally by a C stream. This file handle (an integer) can be used as a handle for the POSIX input/output functions.

Limits

• The function is only available as fastcall function, so it may only be used in presence of a prototype.
• Mixing C file I/O functions and POSIX file I/O functions for the same file may have unpredictable results.

Availability

POSIX 1003.1

See also

creat, open

Example

None.