On Tue, 09 Jun 2009 16:30:30 -0500, Martin McCormick <mar...@dc.cis.okstate.edu> wrote: > Which signal is sent to a process when one types ^z or > Control-z? It appears to be SIGSTOP and according to signal's > man page, this is one signal you can't catch.
You can check the setting with this command: % stty -a cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = <undef>; eol2 = <undef>; erase = ^H; erase2 = ^H; intr = ^C; kill = ^U; lnext = ^V; min = 1; quit = ^\; reprint = ^R; start = ^Q; status = ^T; stop = ^S; susp = ^Z; time = 0; werase = ^W; ^^^^^^^^^ This entry indicates that ^Z sends the suspend signal. According to % stty -g ... status=14:stop=13:susp=1a:time=0:werase=17: ... ^^^^^^^ and % man 3 signal says that 17 SIGSTOP stop process stop (cannot be caught or ignored) And I think that 17 (decimal) is refered to as 1a (hexadecimal) in the previous stty command. > I have an application with a signal handler I wrote and > I am trying to discourage folks typing CTRL-Z if it hangs > because that does make it seem to go away but it is really still > hanging around and any lock files it created are not removed. > The effect is about as bad as if it crashed and left lock files. > Normally, CTRL-c makes it remove the locks before exiting. If I read the information above correctly, ^Z cannot be caught. (I'm always interested in statements that correct me if I'm wrong.) -- Polytropon >From Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ... _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"