8dd81503df
trap 'echo xxx' 1 2 3 15 read x is not interrupted by ^C (due to restartable read syscall) and must be interrupted per POSIX Worse case: read -t 5 x hangs forever after ^C pressed (supposed to timeout after 5 secs) Fixed by adding siginterrupt(signo, 1) after catch handler installed 2) Do not reinstall sighandler immediately after it is called, BSD do it for us