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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)

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IOCTL(2)							System Calls Manual							  IOCTL(2)

NAME
ioctl - control device SYNOPSIS
#include <sys/types.h> #include <sys/ioctl.h> int ioctl(int d, int request, void *argp) (Minix) int ioctl(int d, ioreq_t request, void *argp) (Minix-vmd) DESCRIPTION
Ioctl performs a variety of functions on open descriptors. In particular, many operating characteristics of character special files (e.g. terminals) may be controlled with ioctl requests. The writeups of various devices in section 4 discuss how ioctl applies to them. 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 VALUE
If an error has occurred, a value of -1 is returned and errno is set to indicate the error. ERRORS
Ioctl will fail if one or more of the following are true: [EBADF] D is not a valid descriptor. [ENOTTY] D is not associated with a character special device. [ENOTTY] The specified request does not apply to the kind of object that the descriptor d references. [EINVAL] Request or argp is not valid. SEE ALSO
execve(2), fcntl(2), mt(4), tty(4), intro(4). 4th Berkeley Distribution March 4, 1986 IOCTL(2)
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