Establishing a Connection to the Q.93B Driver

Use the open(2) system call to obtain a file descriptor to the driver. After opening the driver, q_ioc_bind should be called, associating in the Q.93B driver a service access point (SAP) with this application. Finally, if the application is a kernel driver, it should be linked above the Q.93B driver, using the I_LINK or I_PLINK ioctl (refer to the streamio(7) man page for information about this ioctl).