Producing Diagnostic Displays

Producing Diagnostic Displays

Normally a device or STREAMS driver produces display output in only two cases:

To advise the operator or administrator of a serious problem.
To display debugging information during software development.

Both of these purposes are served by the cmn_err() function. It brings to a kernel-level module the abilities that a user-level process gets from printf() and syslog().

Using cmn_err
Using printf()
Using ASSERT