control-4 is control-\, depending on the type of tty you are on. This is a function of the tty subsystem; it delivers SIGQUIT to the tty session processes.
You are going to discover almost the entire works this way, since very few processes block SIGQUIT. This feature is probably older than you. > As the subject says, if you run tcpbench on OpenBSD & press ctrl and 4 > on keyboard, tcpbench with coredump. Tested on -current snapshots form > this month. > Pointing gdb to the core file reports > #0 0x07915849 in kevent () at <stdin>:2 > 2 <stdin>: No such file or directory. > in <stdin> > > #0 0x07915849 in kevent () at <stdin>:2 > #1 0x07f3df87 in kq_dispatch (base=0x7f17a800, arg=0x7fdcc800, tv=0x0) > at /usr/src/lib/libevent/kqueue.c:193 > #2 0x07f3d843 in event_base_loop (base=0x7f17a800, flags=0) > at /usr/src/lib/libevent/event.c:493 > #3 0x07f3dd09 in event_loop (flags=0) at /usr/src/lib/libevent/event.c:426 > #4 0x07f3dd2e in event_dispatch () at /usr/src/lib/libevent/event.c:364 > #5 0x18ac40d6 in ?? () from /usr/bin/tcpbench > #6 0x78b42940 in ?? () > #7 0x00000000 in ?? () > Current language: auto; currently asm > > > Sevan >
