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<html> <body> <pre> NAME ioctl - control device SYNOPSIS #include <sys/ioctl.h> int ioctl(int d, int request, ...) [The "third" argument is traditionally char *argp, and will be so named for this discussion.] DESCRIPTION The ioctl function manipulates the underlying device parameters of special files. In particular, many operat- ing characteristics of sockets and network devices may be controlled with ioctl requests. The argu- ment 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 speci- fying an ioctl request are located in the file <sys/ioctl.h>. RETURN VALUE On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS EBADF d is not a valid descriptor. EFAULT argp references an inaccessible memory area. 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. </pre> </body> </html>