minor nits picked up by valgrind

minor nits picked up by valgrind

[Jeremy Fitzhardinge]

Since valgrind[1] came out, I've been applying it to everything I can
think of.  rc was pretty clean, with one actual (but minor) problem and
one non-problem.

The actual problem is that it doesn't clear out the sa_mask when calling
sigaction, which presumably means that there's a random set of signals
masked when calling the signal handler.  I'm assuming this isn't a big
problem.  Maybe it should be sigfillset instead?

The non-problem is that it tries to call sigaction on SIGKILL and
SIGSTOP.  This is ignored by the kernel, but it makes valgrind complain.

Here's a patch for both of these:

--- rc-1.7/signal.c	Thu Nov  1 03:29:10 2001
+++ rc-1.7.jsgf/signal.c	Tue Jul 30 23:08:39 2002
@@ -14,6 +14,7 @@
 
 	new.sa_handler = handler;
 	new.sa_flags = SA_INTERRUPT;
+	sigemptyset(&new.sa_mask);
 	sigaction(signum, &new, &old);
 	return old.sa_handler;
 }
@@ -96,6 +97,8 @@
 #endif
 
 	for (i = 1; i < NUMOFSIGNALS; i++) {
+		if (i == SIGSTOP || i == SIGKILL)
+			continue;
 		h = sys_signal(i, SIG_IGN);
 		if (h != SIG_IGN && h != SIG_ERR)
 			sys_signal(i, h);


    J

1: http://developer.kde.org/~sewardj/

Re: minor nits picked up by valgrind

[Tim Goodwin]

> Since valgrind[1] came out, I've been applying it to everything I can
> think of.  rc was pretty clean, with one actual (but minor) problem and
> one non-problem.

OK, I'll buy both of these.  Thanks!

And looking again at the signal code, I found a major booboo (of my
own making), which pulled in the horrid longjmp() code on systems
where it was needed.

With this, and some other problems I've fixed, there have been a few
changes since rc-1.7.  A summary is appended, and please see my
hacking page for further details.

    http://www.star.le.ac.uk/~tjg/rc/misc/notes

So, time for a new snapshot.  Here it is:

    http://www.star.le.ac.uk/~tjg/rc/snap/rc-1.7s20020815.tar.gz

Tim.

2002-07-25

  Bug: fix globbing of broken symlinks.

2002-07-31

  Bug: readline doesn't handle EIO either.

2002-08-15

  Bug: variables that are sometimes exported (i.e. $prompt and
  $version) need to be made exportable if they are inherited from the
  environment.

  Portability: don't call sigaction() for SIGKILL or SIGSTOP; don't
  hand a garbage signal mask to sigaction() (thanks Jeremy
  Fitzhardinge).  Also, remove use of SA_INTERRUPT (SUSv3, BSD,
  etc. have SA_RESTART with the inverted meaning).