During its execution, a process makes calls to the UNIX kernel, or system calls. You might want to trace these system calls to see the affect they are having on other processes.
Select a process entry in the Process Manager scrolling pane.
Choose Trace System Calls from the Process menu.
Process Manager displays a dialog box requesting you to enter optional arguments.
Each line of the trace output reports either the fault or signal name or the system call name with its arguments and return values. For further information, see the truss(1) man page.
The equivalent UNIX command is:
truss -p PID
where PID is the process ID of the selected process.