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ioctl(2) [osx man page]

IOCTL(2)						      BSD System Calls Manual							  IOCTL(2)

ioctl -- control device SYNOPSIS
#include <sys/ioctl.h> int ioctl(int fildes, unsigned long request, ...); DESCRIPTION
The ioctl() function manipulates the underlying device parameters of special files. In particular, many operating characteristics of charac- ter special files (e.g. terminals) may be controlled with ioctl() requests. The argument fildes must be an open file descriptor. An ioctl request has encoded in it whether the argument is an ``in'' parameter or ``out'' parameter, and the size of the argument argp in bytes. Macros and defines used in specifying an ioctl request are located in the file <sys/ioctl.h>. RETURN VALUES
If an error has occurred, a value of -1 is returned and errno is set to indicate the error. ERRORS
Ioctl() will fail if: [EBADF] fildes is not a valid descriptor. [EINVAL] Request or argp is not valid. [ENOTTY] fildes is not associated with a character special device. [ENOTTY] The specified request does not apply to the kind of object that the descriptor fildes references. SEE ALSO
cdio(1), chio(1), mt(1), execve(2), fcntl(2), intro(4), tty(4) HISTORY
An ioctl() function call appeared in Version 7 AT&T UNIX. 4th Berkeley Distribution December 11, 1993 4th Berkeley Distribution

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IOCTL(2)							System Calls Manual							  IOCTL(2)

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)
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