41 lines
672 B
C
41 lines
672 B
C
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/*
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FUNCTION
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<<fileno>>---return file descriptor associated with stream
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INDEX
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fileno
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ANSI_SYNOPSIS
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#include <stdio.h>
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int fileno(FILE *<[fp]>);
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TRAD_SYNOPSIS
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#include <stdio.h>
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int fileno(<[fp]>)
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FILE *<[fp]>;
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DESCRIPTION
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You can use <<fileno>> to return the file descriptor identified by <[fp]>.
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RETURNS
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<<fileno>> returns a non-negative integer when successful.
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If <[fp]> is not an open stream, <<fileno>> returns -1.
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PORTABILITY
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<<fileno>> is not part of ANSI C.
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POSIX requires <<fileno>>.
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Supporting OS subroutines required: none.
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*/
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#include <stdio.h>
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#include "local.h"
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int
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_DEFUN (fileno, (f),
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FILE * f)
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{
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CHECK_INIT (f);
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return __sfileno (f);
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}
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