[CC+=linux-api] Hi Andrey, On Mon, Dec 24, 2012 at 9:13 AM, Andrey Vagin <avagin@xxxxxxxxxx> wrote: > The idea is simple. We need to get the siginfo for each signal on dump, > and then return it back on restore. > > The first problem is that the kernel doesn’t report complete siginfo-s > in user-space. In a signal handler the kernel strips SI_CODE from > siginfo. When a siginfo is received from signalfd, it has a different > format with fixed sizes of fields. The interface of signalfd was > extended. If a signalfd is created with the flag SFD_RAW, it returns > siginfo in a raw format. We need to choose a queue, so two flags > SFD_GROUP and SFD_PRIVATE were added. > > rt_sigqueueinfo looks suitable for restoring signals, but it can’t send > siginfo with a positive si_code, because these codes are reserved for > the kernel. In the real world each person has right to do anything with > himself, so I think a process should able to send any siginfo to itself. I see that you CCed me on a couple of the patches in this series. Thanks for that. But, since most of the series concerns API changes, it would be good also to CC linux-api on (future revisions of) the entire series. I have a few largely cosmetic comments on some of the patches, which I'll add in the respective threads. Thanks, Michael > Cc: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx> > Cc: Oleg Nesterov <oleg@xxxxxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> > Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> > Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx> > CC: Cyrill Gorcunov <gorcunov@xxxxxxxxxx> > > -- > 1.7.11.7 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Author of "The Linux Programming Interface", http://blog.man7.org/ -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
