5. Programmers Guide

The following sections are for programmers who want to use the generic SCSI interface in their own applications. An example will be given showing how to access a SCSI device with the INQUIRY and the TESTUNITREADY commands.

When using these code examples, note the following:

• the location of the header files sg.h and scsi.h has changed in kernel version 1.3.98. Now these files are located at /usr/src/linux/include/scsi, which is hopefully linked to /usr/include/scsi. Previously they were in /usr/src/linux/drivers/scsi. We assume a newer kernel in the following text.
• the generic SCSI interface was extended in kernel version 1.1.68; the examples require at least this version. But please avoid kernel version 1.1.77 up to 1.1.89 and 1.3.52 upto 1.3.56 since they had a broken generic scsi interface.
• the constant DEVICE in the header section describing the accessed device should be set according to your available devices (see section sec-header.