Date: Sun, 18 Nov 2007 15:56:29 +0100 From: Tijl Coosemans <tijl@ulyssis.org> To: kozlov_n@epitech.net Cc: freebsd-hackers@freebsd.org Subject: Re: need help with sigaction and siginfo_t Message-ID: <200711181556.30559.tijl@ulyssis.org> In-Reply-To: <20071118143941.bl0onxxsn4wkgg8g@webmail.epitech.net> References: <1195315431.6172.13.camel@tonyhawk.epitech.net> <200711181334.41654.tijl@ulyssis.org> <20071118143941.bl0onxxsn4wkgg8g@webmail.epitech.net>
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On Sunday 18 November 2007 14:39:41 kozlov_n@epitech.net wrote:
> Tijl Coosemans <tijl@ulyssis.org> a =E9crit :
>> On Saturday 17 November 2007 17:03:51 nikita kozlov wrote:
>>> I'm a student and we are working on FreeBSD.
>>> My problem is i don't understand how to use SA_SIGINFO and
>>> siginfo_t. The following code caught my SIGUSR1 with a "kill -30
>>> my_server_pid" from my shell.
>>> but siginfo_t is empty when i'm debugging my program with gdb.
>>> my output is :
>>> > pid 0
>>> and in gdb i have :
>>> {
>>> si_signo =3D 30,
>>> si_errno =3D 0,
>>> si_code =3D 0,
>>> si_pid =3D 0,
>>> si_uid =3D 0,
>>> si_status =3D 0,
>>> si_addr =3D 0x2,
>>> si_value =3D {sigval_int =3D 0,sigval_ptr =3D 0x0},
>>> si_band =3D 0,
>>> __spare__ =3D {0, 0, 0, 0, 0, 0, 0}
>>> }
>>>
>>> anyone have an idea why my siginfo_t is empty please ?
>>
>> Well, it isn't empty. It's just that the si_pid field usually isn't
>> set. It probably should be, but either way, your code should work if
>> you send signals with sigqueue(2) instead of kill(2).
>=20
> Thank you for the reply,
> i have tried to use sigqueue but after a "undefined reference to
> `sigqueue'" compilation error i have opened signal.h and found this
> define :=20
>=20
> #if 0
> /*
> * PR: 35924
> * XXX we don't actually have these. We set _POSIX_REALTIME_SIGNALS to=
=20
> * -1 to show that we don't have them, but this symbol is not necessarily
> * in scope (in the current implementation), so we can't use it here.
> */
> int sigqueue(__pid_t, int, const union sigval);
> #endif
>=20
> I'm working on FreeBSD 5.5-RELEASE-p14, do you have any idea ?
Hmm, looks like it has only been added in FreeBSD 7. If you can't
upgrade, you'll have to use some more advanced IPC mechanism I'm
afraid.
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