Jan Kiszka wrote: > Gilles Chanteperdrix wrote: >> Gilles Chanteperdrix wrote: >>> Philippe Gerum wrote: >>>> Well, what about merging the solutions: trap the signal from the library >>>> constructor by default for people relying on #1, AND document the shadow >>>> signal >>>> handler for people who can do #2? >>> For me, merging the two, would mean keep sigshadow_install called upon >>> thread creation, but export xeno_sigwinch_handler to be callable from >>> user signals. >>> >>> This way, if people install their signal handler before the first thread >>> creation, they have nothing to worry about. If they install their signal >>> handler at a later time, they have to take care of calling >>> xeno_sigwinch_handler and look at its return value. >> Jan, do you agree? The main argument is that people may use third-party >> libraries such as, say, libreadline or libqt which intercept the >> SIGWINCH signal, and that we do not want to recompile these libraries to >> run with Xenomai. > > Yes, I'm fine with the current approach + doc + xeno_sigwinch_handler.
Ok. Since I am going to paste the doc in four different places, I'd better get it right from the beginning. Here is my prose: * @note: When creating or shadowing a Xenomai thread in user-space, for the * first time, Xenomai installs a handler for the SIGWINCH signal. If you had * installed a handler before that, it will be automatically called by Xenomai * for SIGWINCH signals that it has not sent. * * If, however, you install a signal handler for SIGWINCH after creating * or shadowing the first Xenomai thread, you have to explicitely call the * function xeno_sigwinch_handler at the beginning of your signal handler, * using its return to know if the signal was in fact an internal signal of * Xenomai (in which case it returns 1), or if you should handle the signal (in * which case it returns 0). xeno_sigwinch_handler prototype is: * * <b>int xeno_sigwinch_handler(int sig, siginfo_t *si, void *ctxt);</b> * * Which means that you should register your handler with sigaction, using the * SA_SIGINFO flag, and pass all the arguments you received to * xeno_sigwinch_handler. -- Gilles. _______________________________________________ Xenomai-core mailing list Xenomaifirstname.lastname@example.org https://mail.gna.org/listinfo/xenomai-core