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OpenDarwin 7.2.1 - man page for ioctl (opendarwin section 2)

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IOCTL(2)			     BSD System Calls Manual				 IOCTL(2)

     ioctl -- control device

     #include <sys/ioctl.h>

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

     The ioctl() function manipulates the underlying device parameters of special files.  In par-
     ticular, many operating characteristics of character special files (e.g. terminals) may be
     controlled with ioctl() requests.	The argument 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 specify-
     ing an ioctl request are located in the file <sys/ioctl.h>.

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

     Ioctl() will fail if:

     [EBADF]		d is not a valid descriptor.

     [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.

     mt(1), cdio(1), chio(1), execve(2), fcntl(2), tty(4), intro(4)

     An ioctl() function call appeared in Version 7 AT&T UNIX.

4th Berkeley Distribution		December 11, 1993		4th Berkeley Distribution
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