From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marco Jackel <ich@domain.hid>
Date: Wed, 02 Aug 2006 20:53:59 +0200
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Subject: [Xenomai-help] Re: problem with reading from rt_pipe with a normal
	linux process
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To: xenomai@xenomai.org

Mhmm, strange, I can read the data with a "cat /dev/rtp0"....


Marco Jackel wrote:
> Hi,
> i do the following:
> 
> - create a pipe:
> 
> rt_pipe_create (&data_pipe, "data_pipe", PIPE_MINOR, PIPE_SIZE);
> 
> - write data to the pipe:
> 
> rt_pipe_write(&data_pipe, &pipe_buf, pipe_buf_sz, P_NORMAL);
> 
> - open the pipe from a normal linux process:
> 
> pipe_fd = open(DATA_PIPE, O_RDONLY);
> 
> - read the data from the pipe:
> 
> ret = read(pipe_fd, &pipe_buf, sizeof(pipe_buf));
> 
> 
> Opening works, but the reading doesn't work. I get the error code "-1",
> Operation not permitted.
> 
> Permission for the device file is ok:
> 
> voyage:~# ls -l /dev/rtp0
> crw-rw-rw-  1 root root 150, 0 Jun 21  2006 /dev/rtp0
> 
> 
> What am I doing wrong?
> 
> Thanks
> Marco
> 
> 
> Linux voyage 2.6.16.1-03-xenomai-2.1.2 #1 PREEMPT Tue Jul 11 10:17:15
> GMT 2006 i586 GNU/Linux
> 
> Gnu C                  17:
> util-linux             2.12p
> mount                  2.12p
> module-init-tools      3.2-pre1
> e2fsprogs              1.37
> pcmcia-cs              3.2.5
> PPP                    2.4.3
> Linux C Library        2.3.2
> Dynamic linker (ldd)   2.3.2
> Procps                 3.2.1
> Net-tools              1.60
> Kbd                    69:
> Sh-utils               5.2.1
> Modules Loaded         xeno_16550A xeno_rtdm uhci_hcd ohci_hcd usbcore
> dm_mod