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NAME
ioctl - control device
SYNOPSIS
#include <sys/ioctl.h>
int ioctl(int d, int request, ...)
[The "third" argument is traditionally char *argp, and
will be so named for this discussion.]
DESCRIPTION
The ioctl function manipulates the underlying device
parameters of special files. In particular, many operat-
ing characteristics of sockets and network devices
may be controlled with ioctl requests. The argu-
ment d 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 speci-
fying an ioctl request are located in the file
<sys/ioctl.h>.
RETURN VALUE
On success, zero is returned. 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.
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.
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