NAME

ferror, feof, clearerr, fileno − stream status inquiries

SYNOPSIS

#include <stdio.h>

int ferror (stream)
FILE ∗stream;

int feof (stream)
FILE ∗stream;

void clearerr (stream)
FILE ∗stream;

int fileno (stream)
FILE ∗stream;

DESCRIPTION

ferror returns non-zero when an I/O error has previously occurred reading from or writing to the named stream, otherwise zero.

Feof returns non-zero when EOF has previously been detected reading the named input stream, otherwise zero.

Clearerr resets the error indicator and EOF indicator to zero on the named stream.

Fileno returns the integer file descriptor associated with the named stream; see open(2). 

NOTE

All these functions are implemented as macros; they cannot be declared or redeclared.  If the _OCS macro is defined, they are functions in the C library, and not macros. 

SEE ALSO

open(2), fopen(3S). 

CX/UX Programmer’s Reference Manual