FM_STK_DEPTH
char *stkpp[FM_STK_DEPTH];
char buf[FM_STK_DEPTH * FM_SYM_SZ];
for (i = 0; i < depth && i != FM_STK_DEPTH; i++, stkp += FM_SYM_SZ) {
pc_t gcl_stack[FM_STK_DEPTH]; /* saved stack trace, if any */
gcl->gcl_stackdepth = getpcstack(gcl->gcl_stack, FM_STK_DEPTH);