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| 1 | .\" Copyright (c) 1980 Regents of the University of California.
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| 2 | .\" All rights reserved. The Berkeley software License Agreement
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| 3 | .\" specifies the terms and conditions for redistribution.
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| 4 | .\"
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| 5 | .\" @(#)ferror.3s 6.3 (Berkeley) 5/14/86
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| 6 | .\"
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| 7 | .TH FERROR 3 "May 14, 1986"
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| 8 | .UC 4
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| 9 | .SH NAME
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| 10 | ferror, feof, clearerr, fileno \- stream status inquiries
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| 11 | .SH SYNOPSIS
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| 12 | .nf
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| 13 | .ft B
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| 14 | #include <stdio.h>
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| 15 |
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| 16 | int feof(FILE *\fIstream\fP)
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| 17 | int ferror(FILE *\fIstream\fP)
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| 18 | int clearerr(FILE *\fIstream\fP)
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| 19 | int fileno(FILE *\fIstream\fP)
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| 20 | .ft R
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| 21 | .fi
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| 22 | .SH DESCRIPTION
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| 23 | .B Feof
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| 24 | returns non-zero when end of file is read on the named input
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| 25 | .IR stream ,
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| 26 | otherwise zero.
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| 27 | Unless cleared by
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| 28 | .BR clearerr ,
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| 29 | the end-of-file indication lasts until
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| 30 | the stream is closed.
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| 31 | .PP
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| 32 | .B Ferror
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| 33 | returns non-zero when an error has occurred reading or writing
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| 34 | the named
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| 35 | .IR stream ,
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| 36 | otherwise zero.
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| 37 | Unless cleared by
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| 38 | .BR clearerr ,
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| 39 | the error indication lasts until
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| 40 | the stream is closed.
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| 41 | .PP
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| 42 | .B Clearerr
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| 43 | resets the error and end-of-file indicators on the named
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| 44 | .IR stream .
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| 45 | .PP
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| 46 | .B Fileno
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| 47 | returns the integer file descriptor
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| 48 | associated with the
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| 49 | .IR stream ,
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| 50 | see
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| 51 | .BR open (2).
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| 52 | .PP
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| 53 | Currently all of these functions
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| 54 | are implemented as macros;
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| 55 | they cannot be redeclared.
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| 56 | .SH "SEE ALSO"
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| 57 | .BR fopen (3),
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| 58 | .BR open (2).
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