It is being called from a xenomai thread, as far as I can tell. Here is test
code for mq_receive - the call to mq_receive returns with an error. When I run
the same code with the lmqueue library (non-xenomai) that I downloaded I don't
get an error.
void *MyThread (void *dummy)
{
char response [20];
struct mq_attr buf;
buf.mq_msgsize = sizeof (response);
buf.mq_maxmsg = 5;
mqd_t handle = mq_open ("/test", O_CREAT | O_RDONLY, 0, &buf);
printf ("return from initialize_message_queue, handle=%08x\n", handle);
int status = mq_receive (handle, (char *) &response, sizeof (response),
0);
printf ("return from mq_receive, status = %08x, errno = %08x, %s\n",
status, errno, strerror (errno) );
return 0;
}
int main (int argc, char *argv[])
{
pthread_attr_t attr;
pthread_attr_init (&attr);
pthread_create (&my_thread_id, &attr, MyThread, NULL);
pause ();
}
-----Original Message-----
From: Jan Kiszka [mailto:[EMAIL PROTECTED]
Sent: Wednesday, November 30, 2005 5:45 PM
To: Landau, Bracha
Cc: xenomai-help
Subject: Re: [Xenomai-help] using mq_receive and mq_send
Landau, Bracha wrote:
> it says:
> U __wrap_mq_close
> U __wrap_mq_open
> U __wrap_mq_receive
> U __wrap_mq_send
> U __wrap_mq_unlink
Are you calling send and receive from a xenomai thread? EPERM (1) is
typically related to non-RT invocations.
Jan
>
> -----Original Message-----
> From: Philippe Gerum [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, November 30, 2005 4:37 PM
> To: Landau, Bracha
> Cc: [email protected]
> Subject: Re: [Xenomai-help] using mq_receive and mq_send
>
>
> Landau, Bracha wrote:
>> I do link that way. The linking is fine, only the mq_receive and mq_send
>> don't work. I don't even "own" the regular libmqueue library.
>>
>
> What does "nm <your_app>|grep wrap_mq_" says?
>
>> -----Original Message-----
>> From: Philippe Gerum [mailto:[EMAIL PROTECTED]
>> Sent: Wednesday, November 30, 2005 4:01 PM
>> To: Landau, Bracha
>> Cc: [email protected]
>> Subject: Re: [Xenomai-help] using mq_receive and mq_send
>>
>>
>> Landau, Bracha wrote:
>>
>>> I am using Xenomai on the MPC8272ADS board with kernel 2.6.14.3.
>>>
>>> I've created an application that uses posix message queuing from xenomai.
>>>
>>> When I call mq_open, mq_close, mq_setattr, mq_getattr, mq_unlink - the
>>> calls succeed.
>>>
>>> When I call mq_receive or mq_send, the call fails (returns -1) and errno is
>>> set to 1 (Operation not permited).
>>>
>>> I put some debugging printk's into the xenomai code and it seems it doesn't
>>> even get to the call to __mq_receive or __mq_send from syscall.c (it does
>>> get to printk's that I put in the other __mq_* functions).
>>>
>>> Can anyone help?
>>>
>>
>> You must link your app with the flags output by "xeno-config
>> --posix-ldflags". Have a look at skins/posix/demos/Makefile for a
>> working example.
>>
>
>
--
Dipl.-Ing. Jan Kiszka
Institute for Systems Engineering, Real-Time Systems Group (RTS)
Appelstraße 9A, D-30167 Hannover
phone +49 511 762-3974 / fax +49 511 762-4012
http://www.rts.uni-hannover.de
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