Leandro Favarin wrote: > On Tue, Jul 20, 2010 at 3:21 AM, Jan Kiszka <jan.kis...@web.de> wrote: >> Leandro Favarin wrote: >>> Hi all, >>> >>> I have two executable files that communicate with each other through >>> sockets (UDP), both running in the same machine. >>> In the first scenario I made one executable (let's call him client) >>> that generates float values to send to the other (let's call him >>> server), and it's working perfectly. >>> Now I'm modifying my code to use real-time environment, but I'm stuck >>> with the error that rt_dev_recvfrom returns (-1). >>> I also tested with errno and it returned 0. >> Also according to the docs, rt_dev_* returns the error directly. So -1 >> means -EPERM, and that indicates you are calling it over a non-RT task. >> > > Hi Jan, > Thanks for helping me. > I run a few tests here and discovered that the return value of rt_dev_socket > is 0. How is it possible? And what it means? (because in docs the possible > return value is positive or negative when an error occurs.) > Am I missing something?
+0 shall be included ;). No, zero is a valid file descriptor to be returned by rt_dev_socket (and rt_dev_open), the doc isn't correct here. > >>> My system: >>> Ubuntu 9.04 (kernel 2.6.30) >>> Xenomai 2.4.9.1 >>> RTNet 0.9.12 >> These are outdated versions. You may face bugs that have been fixed in >> latest releases in the meantime. >> >> Jan >> > > I know, but I have a few restrictions that I need to follow. Such restriction usually only make sense when upstream fixes are carefully tracked and, where relevant, back-ported. You have been warned. Jan
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