V3/man/man2/close.2

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.he 'CLOSE (II)'3/15/72'CLOSE (II)'
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NAME		close  --  close a file
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SYNOPSIS	(file descriptor in r0)
.br
sys close  / close = 6.
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DESCRIPTION	Given
a file descriptor such as returned from an open or creat call,
close_____ closes the associated file.
A close of all files is automatic on exit, but since
processes are limited to 10 simultaneously open files,
close_____ is necessary for programs which deal with many files.
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SEE ALSO	creat(II), open(II)
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DIAGNOSTICS	The error bit
(c-bit) is set for an unknown file descriptor.
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BUGS		--