Signal SIGTRACE can be sent to a process or process group to start or stop a trace of the z/OS® UNIX System Services syscalls made by the application. The signal is implemented as a toggle. With the trace turned on, the z/OS UNIX System Services kernel gathers the syscall trace records for the targeted processes. A system dump of the user address space can be generated by sending signal SIGDUMP to the same processes to capture the trace output. See z/OS UNIX System Services Command Reference for more information about the SIGTRACE signal.