Re: ERR MSG: called regular read() on /dev/rtdm/fake_dev

Jan Kiszka jan.kiszka at siemens.com
Thu Apr 16 11:14:53 CEST 2020


On 16.04.20 11:09, 孙世龙 wrote:
> Hi,
>        I am using native calls.I intentionally not to use the posix 
> calls to avoid the conflicts with the posix calls provided by linux.
>        My makefile is listed below.
> 
>       My makefile:
> 
>       CFLAGS  := $(shell $(XENO_CONFIG) --skin=native --cflags) -Wall
>       LDFLAGS := $(shell $(XENO_CONFIG) --skin=native --ldflags)

Then you need to mark the POSIX IO calls that target your RTDM device 
with __RT() explicitly.

Jan

> 
>      Look forward to hearing from you.
>      Thanks a lot.
> 
> Jan Kiszka <jan.kiszka at siemens.com <mailto:jan.kiszka at siemens.com>> 于 
> 2020年4月16日周四 下午5:01写道:
> 
>     On 16.04.20 10:57, 孙世龙 via Xenomai wrote:
>      > Hi,
>      >         I got the error message listed below when I called read
>     operation to
>      > an opened rtdm file handle in main function.
>      >         I have implemented the rt read operation in my rtdm
>     driver allready.
>      >         I think the main thread is allready turned into xenomai
>     thread
>      > because I have called rt_shadow_task function before the reading
>     opreation.
>      >         I wonder why this error message occurs.
>      >
>      >         Error message from kernel.
>      >         [155453.637967] [Xenomai] task at 1[42395][42395] called
>     regular read()
>      > on /dev/rtdm/fake_dev.
>      >         Look forward to hearing from you.
>      >        Thanks a lot.
>      >
> 
>     Your application is not properly wrapping the posix calls, in this case
>     read. Check you makefile, ensure that you use the output of
>     "xeno-config
>     --skin posix --ldflags" for linking.
> 
>     Jan
> 
>     -- 
>     Siemens AG, Corporate Technology, CT RDA IOT SES-DE
>     Corporate Competence Center Embedded Linux
> 


-- 
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux



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