Date: Mon, 10 Nov 2008 11:07:38 +0100 From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no> To: Alexey Dokuchaev <danfe@FreeBSD.org> Cc: svn-src-head@freebsd.org, Matteo Riondato <matteo@FreeBSD.org>, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r184780 - head/usr.sbin/cron/crontab Message-ID: <861vxj6gid.fsf@ds4.des.no> In-Reply-To: <20081109084817.GA23323@FreeBSD.org> (Alexey Dokuchaev's message of "Sun, 9 Nov 2008 08:48:17 %2B0000") References: <200811090734.mA97YBld033553@svn.freebsd.org> <20081109084817.GA23323@FreeBSD.org>
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Alexey Dokuchaev <danfe@FreeBSD.org> writes:
> Matteo Riondato <matteo@FreeBSD.org> writes:
> > +void
> > +static remove_tmp(int sig)
> > +{
> > + if (tmp_path) {
> > + unlink(tmp_path);
> > + }
> > + exit(ERROR_EXIT);
> > +}
> This looks weird: `static' should be on same line as `void' as `static
> void' (so ^remove_tmp would match). It will also always exit with
> ERROR_EXIT, which does not look right, does it?
The correct solution would be:
static void
remove_tmp(int sig)
{
(void)sig;
if (tmp_path)
unlink(tmp_path);
_exit(1)
}
This assumes that tmp_path is atomic. In theory, the only type of
global variable you can access from a signal handler is sig_atomic_t,
but in practice, any volatile variable will work.
(yes, the unconditional _exit() is correct)
For bonus points, you should re-throw the signal rather than _exit():
static void
remove_tmp(int sig)
{
if (tmp_path)
unlink(tmp_path);
signal(sig, SIG_DFL);
raise(sig);
}
BTW, the "void (*f[3])()" thing in replace_cmd() is pointless; just
reset the three signals to SIG_DFL.
DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no
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