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proc_stoptrace() is dedicated for emitting a syscall trap for a debugger, either on entry or exit of the system function routine. Changes: - Change an if() branch of an invalid condition of being traced by initproc (PID1) to KASSERT(9). - Assert that the current process has set appropriate flags (PSL_TRACED and PSL_SYSCALL). - Use ktrpoint(KTR_PSIG) and ktrpsig()/e_ktrpsig() in order to register the emitted signal for the ktrace(1) event debugging. Example of the new output from kdump(1) for the syscall debugger traps, containing SIGTRAP notification with TRAP_SCE and TRAP_SCX (around the getpid(2) call). $ kdump /tmp/1.dat.qemu |grep 663 588 1 t_ptrace_waitpid RET fork 663/0x297 663 1 t_ptrace_waitpid EMUL "netbsd" 663 1 t_ptrace_waitpid RET fork 0 663 1 t_ptrace_waitpid CALL ptrace(PT_TRACE_ME,0,0,0) 663 1 t_ptrace_waitpid RET ptrace 0 663 1 t_ptrace_waitpid CALL _lwp_self 663 1 t_ptrace_waitpid RET _lwp_self 1 663 1 t_ptrace_waitpid CALL _lwp_kill(1,0x11) 663 1 t_ptrace_waitpid RET _lwp_kill 0 588 1 t_ptrace_waitpid RET __wait450 663/0x297 663 1 t_ptrace_waitpid CALL getpid 588 1 t_ptrace_waitpid RET __wait450 663/0x297 663 1 t_ptrace_waitpid PSIG SIGTRAP SIG_DFL: code=TRAP_SCE, addr=0x0, trap=0) 663 1 t_ptrace_waitpid RET getpid 663/0x297, 588/0x24c 588 1 t_ptrace_waitpid RET __wait450 663/0x297 663 1 t_ptrace_waitpid PSIG SIGTRAP SIG_DFL: code=TRAP_SCX, addr=0x0, trap=0) 663 1 t_ptrace_waitpid CALL exit(5) 588 1 t_ptrace_waitpid RET __wait450 663/0x297 Sponsored by <The NetBSD Foundation>