ioctl man page on HP-UX

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ioctl(2)							      ioctl(2)

       ioctl - control device

       The  ANSI  C "" construct denotes a variable length argument list whose
       optional [or required] members are given in the associated comment

       performs a variety of functions on character special  files  (devices),
       or  regular  files and directories on VxFS file systems.	 The write-ups
       of various devices in Section (7) discuss how  applies  to  them.   The
       type  of arg is dependent on the specific call, as described in Section

       request is made up of several fields which encode the size  and	direc‐
       tion  of	 the argument (referenced by arg), as well as the desired com‐
       mand.  An enumeration of the request fields are:

	      Argument is read by the driver
				  (meaning that the argument  is  copied  from
				  the application to the driver).

	      Argument is written by the driver
				  (meaning  that  the  argument is copied from
				  the driver to the application).  Ignored  if
				  an error occurs.

	      Number of bytes in the passed argument.
				  A  nonzero  size  indicates  that  arg  is a
				  pointer to the passed argument.  A zero size
				  indicates  that  arg	is the passed argument
				  (if the driver wants to use it), and is  not
				  treated as a pointer.

	      The request command itself.

       When  both  and are zero, it can be assumed that request is not encoded
       for size and direction, for compatibility purposes.  Requests  that  do
       not  require any data to be passed and requests that use arg as a value
       (as opposed to a pointer), have the bit set to one and the field set to

       The  following macros are used to create the request argument.  x and y
       are concatenated to form and shifted into the proper location according
       to  is  the  type (e.g.	of the actual argument that the request refer‐
       ences, and its size is taken and shifted	 into  the  appropriate	 place
       according to

	      Sets		  and  initializes  the	 values at and accord‐

	      Sets		  and initializes the values  at  and  accord‐

	      Sets both		  and and initializes the values at and

       Note: any data structure referenced by arg must contain any pointers.

       If an error has occurred, a value of −1 is returned and is set to indi‐
       cate the error.

       fails if one or more of the following are true: IOC_OUT is  ignored  if
       an error occurs.

	      [EBADF]	     fildes is not a valid open file descriptor.

	      [ENOTTY]	     The  request  is  not appropriate to the selected

	      [EINVAL]	     request or arg is not valid.

	      [EINTR]	     A signal was caught during the system call.

	      [EPERM]	     Typically this  error  indicates  that  an	 ioctl
			     request  was  attempted that is forbidden in some
			     way to the calling process.

       was developed by AT&T and HP.

       ioctl(5), privileges(5), arp(7P), socket(7), termio(7).


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