Symbol: sys_lwp_gettid
sys/kern/init_sysent.c
513
{ 0, 4, (sy_call_t *)sys_lwp_gettid }, /* 496 = lwp_gettid */
sys/sys/sysproto.h
1730
int sys_lwp_gettid (struct sysmsg *sysmsg, const struct lwp_gettid_args *);