38 lines
1.2 KiB
Groff
38 lines
1.2 KiB
Groff
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. \" Manual Seite fuer fdown
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. \" @(#)fdown.3 1.1
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. \"
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.if t .ds a \v'-0.55m'\h'0.00n'\z.\h'0.40n'\z.\v'0.55m'\h'-0.40n'a
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.if t .ds o \v'-0.55m'\h'0.00n'\z.\h'0.45n'\z.\v'0.55m'\h'-0.45n'o
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.if t .ds u \v'-0.55m'\h'0.00n'\z.\h'0.40n'\z.\v'0.55m'\h'-0.40n'u
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.if t .ds A \v'-0.77m'\h'0.25n'\z.\h'0.45n'\z.\v'0.77m'\h'-0.70n'A
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.if t .ds O \v'-0.77m'\h'0.25n'\z.\h'0.45n'\z.\v'0.77m'\h'-0.70n'O
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.if t .ds U \v'-0.77m'\h'0.30n'\z.\h'0.45n'\z.\v'0.77m'\h'-.75n'U
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.if t .ds s \(*b
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.TH FDOWN 3 "15. Juli 1988" "J\*org Schilling" "Schily\'s LIBRARY FUNCTIONS"
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.SH NAME
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fdown() \- returns a logical unit number
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.SH SYNOPSIS
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.nf
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.B
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int fdown(f)
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.B FILE *f;
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.fi
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.SH DESCRIPTION
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fdown(), given a standard I/O FILE *f, returns the file
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number. A file number is usually a small number like 2
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which is not a unique number system-wide but is peculiar to the
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specified process.
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fdown() can be used to implement additional functions not
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provided for in the standard I/O library. It verifies that the
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file was opened via fileopen().
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.SH RETURNS
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Returns the actual system file number.
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.SH NOTES
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Since this call is system dependent, it should be used
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carefully.
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