usr/src/lib/libc/stdio/ferror.3

.\" Copyright (c) 1990, 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek and the American National Standards Committee X3,
.\" on Information Processing Systems.
.\"
.\" %sccs.include.redist.man%
.\"
.\"     @(#)ferror.3    6.8 (Berkeley) %G%
.\"
.Dd
.Dt FERROR 3
.Os
.Sh NAME
.Nm clearerr ,
.Nm feof ,
.Nm ferror ,
.Nm fileno
.Nd check and reset stream status
.Sh SYNOPSIS
.Fd #include <stdio.h>
.Ft void
.Fn clearerr "FILE *stream"
.Ft int
.Fn feof "FILE *stream"
.Ft int
.Fn ferror "FILE *stream"
.Ft int
.Fn fileno "FILE *stream"
.Sh DESCRIPTION
The function
.Fn clearerr
clears the end-of-file and error indicators for the stream pointed
to by
.Fa stream .
.Pp
The function
.Fn feof
tests the end-of-file indicator for the stream pointed to by
.Fa stream ,
returning non-zero if it is set.
The end-of-file indicator can only be cleared by the function
.Fn clearerr .
.Pp
The function
.Fn ferror
tests the error indicator for the stream pointed to by
.Fa stream ,
returning non-zero if it is set.
The error indicator can only be reset by the
.Fn clearerr
function.
.Pp
The function
.Fn fileno
examines the argument
.Fa stream
and returns its integer desciptor.
.Sh ERRORS
These functions should not fail and do not set the external
variable
.Va errno .
.Sh SEE ALSO
.Xr open 2 ,
.Xr stdio 3
.Sh STANDARDS
The functions
.Fn clearerr ,
.Fn feof ,
and
.Fn ferror
conform to
.St -ansiC .