C and C++ SoftBench User's Guide

Using SoftBench Debugger
Handling Signals and Events
Chapter 7214
Handling Signals and Events
The UNIX operating system notifies a program of asynchronous events
via signals. HP-UX also supports other "events" such as exec (program
load) and throw (used in C++ exception handling). SoftBench Debugger
handles these events using intercepts.
Intercepts are distinct from any signal handlers in your program. They
intercept signals before they are sent to your program, and may either
pass signals through to your program (to be handled by your signal
handlers) or discard them.
Viewing and Editing Intercepts
"Execution: Signals/Intercepts…" brings up a dialog box with the
current state of debugger signal and event handling, and allows you to
control what SoftBench Debugger does with any intercept.
You can modify intercept handling only when SoftBench Debugger is in
control. When your program runs, you must interrupt it (using Interrupt
Program
) or wait for it to hit a breakpoint before you can specify intercept
handlers.
The scrollable list at the top of the "Intercepts" dialog box (see Figure
7-13) shows the current status of all available intercepts. This list shows
all the attributes of each intercept, and also shows the "monitor number"
(useful if you want to issue certain commands to DDE) and the number
of times the intercept has been received. Note that the "monitor number"
does not correspond to the UNIX signal number.