NAME

ioctl − control device

SYNOPSIS

#include <saio/saioctl.h>

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

DESCRIPTION

Ioctl performs a variety of functions on open descriptors.  The writeups of various devices in section 4 discuss how ioctl applies to them. 

RETURN VALUE

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