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-.TH IOCTL 2
-.CT 2 file_io file_inq_creat
-.SH NAME
-ioctl \(mi miscellaneous control operations
-.SH SYNOPSIS
-.nf
-.B #include <sgtty.h>
-.PP
-.B int ioctl(fildes, request, argp)
-.B struct sgttyb *argp;
-.fi
-.SH DESCRIPTION
-.I Ioctl
-performs a variety of functions
-on special files and streams.
-The writeups of various devices
-in section 4 discuss how
-.I ioctl
-applies to them.
-.PP
-Some calls, however, apply to any open file,
-including
-the process-exclusive calls
-.BR FIOPX,
-.BR FIONPX,
-and
-.BR FIOQX
-(see
-.IR pex (4)),
-as well as
-the following two standard calls,
-.IP
-.L
-ioctl(fildes, FIOCLEX, (void *)0);
-.br
-.L
-ioctl(fildes, FIONCLEX, (void *)0);
-.LP
-The first causes the file to be closed automatically upon
-a successful
-.IR exec (2);
-the second causes the file to be left open.
-.SH "SEE ALSO"
-.IR stty (1), 
-.IR exec (2),
-.IR proc (4),
-.IR ttyld (4)
-.SH DIAGNOSTICS
-.BR EBADF ,
-.BR EFAULT ,
-.BR EIO ,
-.BR ELAB ,
-.BR ENODEV ,
-.BR ENOTTY
-.SH BUGS
-Strictly speaking,
-since
-.I ioctl
-may be extended in different ways to devices with
-different properties,
-.I argp
-should have an open-ended declaration like
-.IP
-.L
-union { struct sgttyb ...; ... } *argp;
-.PP
-The important thing is that the size is at least
-.B sizeof(struct
-.BR sgttyb) .
-.br
-.I Ioctl
-requests vary among UNIX systems;
-undisciplined use is likely to compromise portability.