ioctl man page on Ultrix

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ioctl(2)							      ioctl(2)

       ioctl - control device

       #include <sys/ioctl.h>

       ioctl(d, request, argp)
       int d, request;
       char *argp;

       The  call performs a variety of functions on open descriptors.  In par‐
       ticular, many operating characteristics of character special files (for
       example,	 terminals) can be controlled with requests.  Certain requests
       operate on a  number  of	 device	 types.	 These	include	 informational
       requests, such as and The descriptions of various devices in the Refer‐
       ence Pages, Section 4: Special Files discuss how applies to them.  Also
       consult <sys/ioctl.h> for more information.

       An  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  request are located in the file

Return Values
       If an error has occurred, a value of -1 is returned, and errno  is  set
       to indicate the error.

       The call fails under the following conditions:

       [EBADF]	      The d is not a valid descriptor.

       [ENOTTY]	      The d is not associated with a character special device.

       [ENOTTY]	      The  specified  request  does  not  apply to the kind of
		      object which the descriptor d references.

       [EINVAL]	      The request or argp is not valid.

       [EFAULT]	      The argp points to  memory  that	is  not	 part  of  the
		      process' address space.

See Also
       execve(2), fcntl(2), devio(4), intro(4n), mu(4), nbuf(4), tty(4)


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