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-.\" Copyright (c) 1980, 1991, 1993, 1994
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
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-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)close.2	8.2 (Berkeley) 4/19/94
-.\"	$Id$
-.\"
-.Dd April 19, 1994
-.Dt CLOSE 2
-.Os BSD 4
-.Sh NAME
-.Nm close
-.Nd delete a descriptor
-.Sh SYNOPSIS
-.Fd #include <unistd.h>
-.Ft int
-.Fn close "int d"
-.Sh DESCRIPTION
-The
-.Fn close
-call deletes a descriptor from the per-process object
-reference table.
-If this is the last reference to the underlying object, the
-object will be deactivated.
-For example, on the last close of a file
-the current
-.Em seek
-pointer associated with the file is lost;
-on the last close of a
-.Xr socket 2
-associated naming information and queued data are discarded;
-on the last close of a file holding an advisory lock
-the lock is released (see further
-.Xr flock 2 ) .
-.Pp
-When a process exits,
-all associated file descriptors are freed, but since there is
-a limit on active descriptors per processes, the
-.Fn close
-function call
-is useful when a large quantity of file descriptors are being handled.
-.Pp
-When a process forks (see
-.Xr fork 2 ) ,
-all descriptors for the new child process reference the same
-objects as they did in the parent before the fork.
-If a new process is then to be run using
-.Xr execve 2 ,
-the process would normally inherit these descriptors.  Most
-of the descriptors can be rearranged with
-.Xr dup2 2
-or deleted with
-.Fn close
-before the
-.Xr execve 2
-is attempted, but if some of these descriptors will still
-be needed if the execve fails, it is necessary to arrange for them
-to be closed if the execve succeeds.
-For this reason, the call
-.Dq Li fcntl(d, F_SETFD, 1)
-is provided,
-which arranges that a descriptor will be closed after a successful
-execve; the call
-.Dq Li fcntl(d, F_SETFD, 0)
-restores the default,
-which is to not close the descriptor.
-.Sh IMPLEMENTATION NOTES
-.Pp
-In the non-threaded library
-.Fn close
-is implemented as the
-.Va close
-syscall.
-.Pp
-In the threaded library, the
-.Va close
-syscall is assembled to
-.Fn _thread_sys_close
-and
-.Fn close
-is implemented as a function which locks
-.Va d
-for read and write, then calls
-.Fn _thread_sys_close .
-Before returning,
-.Fn close
-unlocks
-.Va d .
-.Sh RETURN VALUES
-Upon successful completion, a value of 0 is returned.
-Otherwise, a value of -1 is returned and the global integer variable
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-.Fn Close
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EBADF
-.Fa D
-is not an active descriptor.
-.It Bq Er EINTR
-An interrupt was received.
-.El
-.Sh SEE ALSO
-.Xr accept 2 ,
-.Xr execve 2 ,
-.Xr fcntl 2 ,
-.Xr flock 2 ,
-.Xr open 2 ,
-.Xr pipe 2 ,
-.Xr socket 2 ,
-.Xr socketpair 2
-.Sh STANDARDS
-The
-.Fn close
-function call is expected to conform to 
-.St -p1003.1-90 .
-.Sh HISTORY
-A
-.Fn close
-function call appeared in
-.At v7 .