sysctl_tstring
error = sysctl_tstring(oldp, oldlenp, newp, newlen,
error = sysctl_tstring(oldp, oldlenp, newp, newlen,
error = sysctl_tstring(oldp, oldlenp, newp, newlen,
int sysctl_tstring(void *, size_t *, void *, size_t, char *, size_t);