07-03-2010
Quote:
Originally Posted by
Bradj47
From what I hear it's not necessarily Linux but it is a Unix-like OS.
sorry about the old bump, but i think there's something that should be said, on top of what else has been said about this, and that is Unix-like is a definition of Linux.
i know i know, it's actually named after the creator, and not the similar letters in the name, but if you look up any Linux distro on wiki you will find they're defined as Unix-like on the right hand side of the page.
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IOCTL(2) Linux Programmer's Manual IOCTL(2)
NAME
ioctl - control device
SYNOPSIS
#include <sys/ioctl.h>
int ioctl(int d, int request, ...);
DESCRIPTION
The ioctl() function manipulates the underlying device parameters of special files. In particular, many operating characteristics of char-
acter special files (e.g., terminals) may be controlled with ioctl() requests. The argument d must be an open file descriptor.
The second argument is a device-dependent request code. The third argument is an untyped pointer to memory. It's traditionally char *argp
(from the days before void * was valid C), and will be so named for this discussion.
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
Usually, on success zero is returned. A few ioctl() requests use the return value as an output parameter and return a nonnegative value on
success. On error, -1 is returned, and errno is set appropriately.
ERRORS
EBADF d is not a valid descriptor.
EFAULT argp references an inaccessible memory area.
EINVAL Request or argp is not valid.
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.
CONFORMING TO
No single standard. Arguments, returns, and semantics of ioctl() vary according to the device driver in question (the call is used as a
catch-all for operations that don't cleanly fit the Unix stream I/O model). See ioctl_list(2) for a list of many of the known ioctl()
calls. The ioctl() function call appeared in Version 7 AT&T Unix.
NOTES
In order to use this call, one needs an open file descriptor. Often the open(2) call has unwanted side effects, that can be avoided under
Linux by giving it the O_NONBLOCK flag.
SEE ALSO
execve(2), fcntl(2), ioctl_list(2), open(2), sd(4), tty(4)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2000-09-21 IOCTL(2)