Re: [RFC PATCH 1/5] misc: Convert daemon () to GNU coding style

[Sergey Bugaev <bugaevc@gmail.com>]

On Tue, Apr 18, 2023 at 9:49 PM Adhemerval Zanella Netto
<adhemerval.zanella@linaro.org> wrote:
>
>
>
> On 18/04/23 10:48, Cristian Rodríguez wrote:
> >
> >
> > On Tue, Apr 18, 2023 at 8:02 AM Adhemerval Zanella Netto via Libc-alpha <libc-alpha@sourceware.org <mailto:libc-alpha@sourceware.org>> wrote:
> >
> >
> >
> >     On 17/04/23 19:58, Sergey Bugaev via Libc-alpha wrote:
> >     > This is nicer, and is going to be required for the following changes
> >     > to reasonably stay within the 79 column limit.
> >     >
> >     > No functional change.
> >     >
> >     > Signed-off-by: Sergey Bugaev <bugaevc@gmail.com <mailto:bugaevc@gmail.com>>
> >
> >     LGTM, some minor nits below.
> >
> >     > ---
> >     >  misc/daemon.c | 88 ++++++++++++++++++++++++++++-----------------------
> >     >  1 file changed, 49 insertions(+), 39 deletions(-)
> >     >
> >     > diff --git a/misc/daemon.c b/misc/daemon.c
> >     > index 3c73ac2a..61da49b7 100644
> >     > --- a/misc/daemon.c
> >     > +++ b/misc/daemon.c
> >     > @@ -43,50 +43,60 @@ static char sccsid[] = "@(#)daemon.c      8.1 (Berkeley) 6/4/93";
> >
> >
> >     I think there is no need to ignore return code.
> >
> >
> > Also This code clearly comes from freeBSD.. which has since updated the code to ignore SIGHUP  when the parent exits.
> >
> > https://web.mit.edu/freebsd/head/lib/libc/gen/daemon.c <https://web.mit.edu/freebsd/head/lib/libc/gen/daemon.c>
>
> I think such change should be in a different patch though.

I'm going to send out a v2 of this series with the proposed changes to
daemon () included (in a separate patch from reformatting it).

It is my understanding, though, that setting and resetting the signal
handler like that is racy, since signal delivery is asynchronous. We
may get a SIGHUP some time after daemon () completes, even.

Sergey