3BSD/usr/man/man2/close.2

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.TH CLOSE 2 
.SH NAME
close \- close a file
.SH SYNOPSIS
.B close(fildes)
.PP
.SH DESCRIPTION
Given
a file descriptor such as returned from an
.I open,
.I creat,
.I dup
or
.IR pipe (2)
call,
.I close
closes the associated file.
A close of all files is automatic on
.I exit,
but since
there is a limit on the number of open files per process,
.I close
is necessary for programs which deal with many files.
.PP
Files are closed upon termination of a process, and
certain high-numbered file descriptors are closed by
.IR exec (2).
.SH "SEE ALSO"
creat(2), open(2), pipe(2), exec(2)
.SH DIAGNOSTICS
Zero is returned if a file is closed;
\-1 is returned for an unknown file descriptor.
.SH "ASSEMBLER (PDP-11)"
(close = 6.)
.br
(file descriptor in r0)
.br
.B sys close
.PP
.SH BUGS
A file cannot be closed while there are pages which have been
.I vread
but not referenced.