SYS_spawn
(void) mdb_tgt_add_sysexit(t, SYS_spawn, hflag, pt_fork, NULL);
int is_spawn = (psp->pr_what == SYS_spawn);
what == SYS_spawn) {
praddset(&traceeven, SYS_spawn);
return (syscall(SYS_spawn, path, sp, spsize, sa, sasize));