#define $\_$POSIX$\_$C$\_$SOURCE $200809$L

#include

#include

#include "signal.h$"$

static void

interrupting$\_$signal$\_$handler$($int signo$)$

$\{$

$/*$ Its only job is to interrupt system calls$--$like read$()--$when

$*$ certain signals arrive$--$like Ctrl$-$C$.$

$*/$

$\}$