Listing 5

$ ./instrument | xargs addr2line -e instrument -f
main
/home/mtj/gnu-ext/instrument.c:33
func_a
/home/mtj/gnu-ext/instrument.c:25
func_b
/home/mtj/gnu-ext/instrument.c:18
func_c
/home/mtj/gnu-ext/instrument.c:13
func_c
/home/mtj/gnu-ext/instrument.c:13
$