Bastian Blank:
> On Wed, Apr 04, 2018 at 08:56:46PM -0400, Wietse Venema wrote:
> > That may be so, but why does the lame Linux kernel silently ignore
> > the kill() call instead of properly returning an error.
>
> The signal is ignored the same way as if someone had called
> | signal(SIGFOO, SIG_IGN)
Postfix code is (while handling SIGTERM)
sigemptyset(&action.sa_mask);
action.sa_flags = 0;
action.sa_handler = SIG_DFL;
if (sigaction(sig, &action, (struct sigaction *) 0) < 0)
msg_fatal("%s: sigaction: %m", myname);
if (kill(pid, sig) < 0)
msg_fatal("%s: kill myself: %m", myname);
So Linux also ignores sigaction with SIG_DFL without returning an
error. Undocumented behavior -> Lame.
Wietse
