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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.