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->IOCTL(2) System Calls Manual IOCTL(2)
-
-NAME
- ioctl - control device
-
-SYNOPSIS
- #include <sys/ioctl.h>
-
- int
- ioctl(int d, unsigned long request, ...);
-
-DESCRIPTION
- 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. The third argument is
- called arg and contains additional information needed by this device to
- perform the requested function. arg is either an int or a pointer to a
- device-specific data structure, depending upon the given request.
-
- An ioctl request has encoded in it whether the argument is an ``in''
- parameter or ``out'' parameter, and the size of the third argument (arg)
- in bytes. Macros and defines used in specifying an ioctl request are
- located in the file <sys/ioctl.h>.
-
-RETURN VALUES
- If an error has occurred, a value of -1 is returned and errno is set to
- indicate the error.
-
-ERRORS
- 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 arg is not valid.
-
- [EFAULT] arg points outside the process's allocated address
- space.
-
-SEE ALSO
- cdio(1), chio(1), mt(1), execve(2), fcntl(2), intro(4), tty(4)
-
-HISTORY
- An ioctl() function call appeared in Version 7 AT&T UNIX.
-
-BSD December 11, 1993 BSD
- </PRE
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