ioctl man page on 4.4BSD

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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 spe‐
     cial files.  In particular, 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 specifying 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), 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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