On Wed, Jun 5, 2019 at 2:57 PM Gabriel-Andrew Pollo-Guilbert <gabriel.pollo-guilb...@efficios.com> wrote: > > diff --git a/doc/man/lttng-ust.3.txt b/doc/man/lttng-ust.3.txt > index 5c9c9f5d..d58b43c7 100644 > --- a/doc/man/lttng-ust.3.txt > +++ b/doc/man/lttng-ust.3.txt > @@ -744,6 +744,17 @@ library before you start the application. Typical use > cases include > daemons closing all file descriptors after man:fork(2), and buggy > applications doing ``double-closes''.
A few documentation fixes: > > +Using LTTng-UST with applications that change user ... that change the effective user ID > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > +If your application is traced using per-UID buffers and changes user ID using If LTTng traces your application using per-UID buffers (see the nloption:--buffers-uid option of man:lttng-enable-channel(1)) and changes the process's effective user ID with > +man:setuid(2), the library `liblttng-ust-setuid.so` needs to be preloaded > +before starting the application with the `LD_PRELOAD` environment variable > (see > +man:ld.so(8)). This way, events generated after the UID change will be > forwarded ... event records generated after the user ID change are forwarded ... > +to the correct buffer. > + > +This workaround requires that the tracing session be global (root > +lttng-sessiond) in order to avoid permission problems between a session ... be global (created by a root session daemon; see man:lttng-sessiond(1)) to avoid permission problems of a session > +daemon started by another user. Phil > -- > 2.21.0 > > _______________________________________________ > lttng-dev mailing list > lttng-dev@lists.lttng.org > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
