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-[[!meta copyright="Copyright © 2010, 2011, 2012 Free Software Foundation,
-Inc."]]
-
-[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
-id="license" text="Permission is granted to copy, distribute and/or modify this
-document under the terms of the GNU Free Documentation License, Version 1.2 or
-any later version published by the Free Software Foundation; with no Invariant
-Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
-is included in the section entitled [[GNU Free Documentation
-License|/fdl]]."]]"""]]
-
-[[!meta title="SA_SIGINFO, SA_SIGACTION"]]
-
-[[!tag open_issue_glibc]]
-
-Note: SA_SIGINFO has now been implemented by Jérémie Koenig. It will be
-uploaded in Debian eglibc 2.13-19.
-
-IRC, #hurd, August / September 2010:
-
- <giselher> Hy, I came across SA_SIGINFO in cherokee, I have the void sighandler(int num) prototype but how do I add the sa_handler field?
- <pinotree> if SA_SIGACTION is not defined, then you use sa_handler instead of sa_sigaction, and not add SA_SIGINFO in the sa_flags
- <giselher> SA_SIGINFO is not defined
- <pinotree> s/SA_SIGACTION/SA_SIGINFO/ above, yes
- <giselher> K
- <giselher> I am not sure if I fully understand this, there is the line "act.sa_flags = SA_SIGINFO" and how do I have to change that >_>
- <pinotree> can you paste the source in a pastebin?
- <giselher> k
- <giselher> http://archhurd.pastebin.com/N8BCnG6g at line 790
- <pinotree> something along the lines of http://www.archhurd.pastebin.com/tdpcFD5G
- <pinotree> note that in the handler the siginfo_t parameter is used, which cannot be done if SA_SIGINFO is not defined
- <pinotree> (that code still won't compile, yet)
- <giselher> btw: is there a reason why SA_SIGINFO is not implemented?
- <giselher> the guildlines only say "It's not implemented"
- <azeem> 09:43 < azeem> signal stuff is tricky :-/
- <azeem> basically it was pending on a complete rewrite by Roland, which never occured
- <youpi> I have an almost complete implementation, just not finished yet
- <youpi> (only the siginfo part)
- <azeem> nobody really groked that code for years until youpi showed up, but he added partial support AFAIK, not having much time on his hand
- <azeem> ah, he's here
- <azeem> :)
- <giselher> oh, should I just wait ?
- <youpi> no
- <giselher> k
- <youpi> there are OSes which don't have SA_SIGINFO
- <youpi> just cope with them: use sa_handler instead of sa_sigaction, and don't set SA_SIGINFO
- <youpi> (i.e. replace with 0 in your example)
- <giselher> ok
- <youpi> when SA_SIGINFO becomes available, it'll just be used
-
-IRC, freenode, #hurd, 2011-08-20:
-
- < youpi> erf, tcpwrappers will need si_pid
- < jkoenig> I could implement it not too far away in the future, we just
- need a version of msg_sig_post() with a siginfo argument or something.
- < youpi> I can also see a lot of packages using SA_SIGINFO for no reason...
- < youpi> (probably copy/pasty code)
- < youpi> sa.sa_flags = SA_SIGINFO;
- < youpi> sa.sa_handler = parse_config;
- < youpi> void parse_config(int)
- < youpi> yay
- < youpi> if(siginf->si_signo == SIGXCPU)
- < youpi> fprintf(stderr, "Exceeded CPU usage.\n");
- < youpi> ...
- < youpi> jkoenig: actually most package don't actually use the SA_SIGINFO
- they request...
- < youpi> jkoenig: si_pid should get us almost all actually used coverage
- < youpi> I've seen only one example using si_errno
- < jkoenig> ok
- < youpi> oh, it's actually supported by your patch
- < youpi> (errno)
- < jkoenig> but I guess since implementing si_pid will require a new RPC, we
- might as well plan for the rest
- < youpi> jkoenig: indeed
- < jkoenig> youpi, hmm I doubt it's properly filled in in all circumstances?
- < youpi> ok, well, we'll see
- < pinotree> jkoenig: if it can be of help, boost::unit_test queries various
- fields of siginfo_t depending on the signal
- < pinotree> jkoenig: also, pulseaudio uses siginfo_t for remapping faulting
- memory on SIGBUS
- < jkoenig> pinotree, oh ok good to know
- < pinotree> *faulty
- < youpi> jkoenig: well, I guess you had checked that the si_addr field is
- correct in a few simple testcase :)
- < jkoenig> hmm I think so, yes
- < jkoenig> I ran like, "* (char *) 0x12345678;" or something IIRC
- < youpi> ok
- < jkoenig> I seem to remember mach generated SIGBUS instead of SIGSEGV
- depending on the upper bit, or something (I can't quite remember)
- < jkoenig> but when sigsegv was generated si_addr was right.
- < pinotree> jkoenig: (see boost/test/impl/execution_monitor.ipp in boost
- sources)
- < pinotree> maybe you can try the unit tests for boost::unit_tests, if any
- :)
- < pinotree> (while src/pulsecore/memtrap.c in PA)
- * pinotree stops doing MrObvious™