On Tue, Jun 24, 2025 at 11:19:53AM +0200, Csókás Bence wrote:
> Hi,
>
> On 2025. 06. 14. 18:09, Nadav Tasher wrote:
> > This commit adds the reset_all_signals() function,
> > which resets all custom signal handlers to the default
> > signal handler (SIG_DFL).
> >
> > Signed-off-by: Nadav Tasher <tasherna...@gmail.com>
> > ---
> > include/libbb.h | 2 ++
> > libbb/signals.c | 26 ++++++++++++++++++++++++++
> > 2 files changed, 28 insertions(+)
> >
> > diff --git a/include/libbb.h b/include/libbb.h
> > index ed2af5af2..11d2c27ec 100644
> > --- a/include/libbb.h
> > +++ b/include/libbb.h
> > @@ -649,6 +649,8 @@ int sigprocmask2(int how, sigset_t *set) FAST_FUNC;
> > /* Standard handler which just records signo */
> > extern smallint bb_got_signal;
> > void record_signo(int signo); /* not FAST_FUNC! */
> > +/* Resets all signal handlers just like exec() does */
> > +void reset_all_signals(void) FAST_FUNC;
> > void xsetgid(gid_t gid) FAST_FUNC;
> > diff --git a/libbb/signals.c b/libbb/signals.c
> > index 0bebc847d..2211a8bac 100644
> > --- a/libbb/signals.c
> > +++ b/libbb/signals.c
> > @@ -128,3 +128,29 @@ void FAST_FUNC signal_no_SA_RESTART_empty_mask(int
> > sig, void (*handler)(int))
> > sa.sa_handler = handler;
> > sigaction_set(sig, &sa);
> > }
> > +
> > +void FAST_FUNC reset_all_signals(void)
> > +{
> > + struct sigaction sa;
>
> spaces -> tabs
>
Will fix in next revision. Thanks!
> > + memset(&sa, 0, sizeof(sa));
> > +
> > + /* used as the default sigaction */
> > + sa.sa_handler = SIG_DFL;
> > +
> > + for (int sig = 1; sig < NSIG; ++sig) {
> > + struct sigaction old;
> > +
> > + /* returns 0 on success*/
> > + if (sigaction(sig, NULL, &old) != 0)
> > + continue;
> > +
> > + if (old.sa_handler == SIG_IGN)
> > + continue;
> > +
> > + if (old.sa_handler == SIG_DFL)
> > + continue;
> > +
> > + /* change signal handler to default */
> > + sigaction(sig, &sa, NULL);
> > + }
> > +}
> > \ No newline at end of file
>
>
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