gno/usr.man/man3/clearerr.3

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.TH FERROR 3 "15 September 1997" GNO "Library Routines"
.SH NAME
.BR clearerr ,
.BR feof ,
.BR ferror ,
.BR fileno
\- check and reset stream status
.SH SYNOPSIS
#include <stdio.h>
.sp 1
void \fBclearerr\fR (FILE *\fIstream\fR);
.br
int \fBfeof\fR (FILE *\fIstream\fR);
.br
int \fBferror\fR (FILE *\fIstream\fR);
.br
int \fBfileno\fR (FILE *\fIstream\fR);
.SH DESCRIPTION
The function
.BR clearerr 
clears the end-of-file and error indicators for the stream pointed
to by
.IR stream .
.LP
The function
.BR feof 
tests the end-of-file indicator for the stream pointed to by
.IR stream ,
returning non-zero if it is set.
The end-of-file indicator can only be cleared by the function
.BR clearerr .
.LP
The function
.BR ferror 
tests the error indicator for the stream pointed to by
.IR stream ,
returning non-zero if it is set.
The error indicator can only be reset by the
.BR clearerr 
function.
.LP
The function
.BR fileno 
examines the argument
.I stream
and returns its integer descriptor.
.SH ERRORS
These functions should not fail and do not set the external
variable
.IR errno .
.SH SEE ALSO
.BR open (2),
.BR stdio (3)
.SH STANDARDS
The functions
.BR clearerr ,
.BR feof ,
and
.BR ferror 
conform to ANSI/C.