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ioctl(2) [v7 man page]

IOCTL(2)							System Calls Manual							  IOCTL(2)

NAME
ioctl, stty, gtty - control device SYNOPSIS
#include <sgtty.h> ioctl(fildes, request, argp) struct sgttyb *argp; stty(fildes, argp) struct sgttyb *argp; gtty(fildes, argp) struct sgttyb *argp; DESCRIPTION
Ioctl performs a variety of functions on character special files (devices). The writeups of various devices in section 4 discuss how ioctl applies to them. For certain status setting and status inquiries about terminal devices, the functions stty and gtty are equivalent to ioctl(fildes, TIOCSETP, argp) ioctl(fildes, TIOCGETP, argp) respectively; see tty(4). The following two calls, however, apply to any open file: ioctl(fildes, FIOCLEX, NULL); ioctl(fildes, FIONCLEX, NULL); The first causes the file to be closed automatically during a successful exec operation; the second reverses the effect of the first. SEE ALSO
stty(1), tty(4), exec(2) DIAGNOSTICS
Zero is returned if the call was successful; -1 if the file descriptor does not refer to the kind of file for which it was intended. BUGS
Strictly speaking, since ioctl may be extended in different ways to devices with different properties, argp should have an open-ended dec- laration like union { struct sgttyb ...; ... } *argp; The important thing is that the size is fixed by `struct sgttyb'. ASSEMBLER
(ioctl = 54.) sys ioctl; fildes; request; argp (stty = 31.) (file descriptor in r0) stty; argp (gtty = 32.) (file descriptor in r0) sys gtty; argp IOCTL(2)

Check Out this Related Man Page

STTY(3) 						   BSD Library Functions Manual 						   STTY(3)

NAME
stty, gtty -- set and get terminal state (defunct) LIBRARY
Compatibility Library (libcompat, -lcompat) SYNOPSIS
#include <sgtty.h> stty(int fd, struct sgttyb *buf); gtty(int fd, struct sgttyb *buf); DESCRIPTION
These interfaces are obsoleted by ioctl(2). They are available from the compatibility library, libcompat. The stty() function sets the state of the terminal associated with fd. The gtty() function retrieves the state of the terminal associated with fd. To set the state of a terminal the call must have write permission. The stty() call is actually 'ioctl(fd, TIOCSETP, buf)', while the gtty() call is 'ioctl(fd, TIOCGETP, buf)'. See ioctl(2) and tty(4) for an explanation. DIAGNOSTICS
If the call is successful 0 is returned, otherwise -1 is returned and the global variable errno contains the reason for the failure. SEE ALSO
ioctl(2), tty(4) HISTORY
The stty() and gtty() functions appeared in 4.2BSD. BSD
June 4, 1993 BSD
Man Page

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