writing alarm function

[Greg]

I am writing some code for a kernel of a board that does not contain
the alarm function call. I would like to use it so I am trying to
duplicate its functionality. Basically what I have is inside my alarm
function I create a new thread that sleeps for the time passed in and
then raises SIGALRM. I am using this to try and interrupt a recvfrom
call by basically creating a timeout using this alarm function. Does
anyone know a better way to do this or am I doing this? PS...I don't
have setitimer either with the kernel.

 

[Antoninus Twink]

I am writing some code for a kernel of a board that does not contain
the alarm function call. I would like to use it so I am trying to
duplicate its functionality. Basically what I have is inside my alarm
function I create a new thread that sleeps for the time passed in and
then raises SIGALRM. I am using this to try and interrupt a recvfrom
call by basically creating a timeout using this alarm function. Does
anyone know a better way to do this or am I doing this? PS...I don't
have setitimer either with the kernel.

And the baying hounds are loosed in 3... 2... 1...

 

[ppi]

I am writing some code for a kernel of a board that does not contain
the alarm function call. I would like to use it so I am trying to
duplicate its functionality. Basically what I have is inside my alarm
function I create a new thread that sleeps for the time passed in and
then raises SIGALRM. I am using this to try and interrupt a recvfrom
call by basically creating a timeout using this alarm function. Does
anyone know a better way to do this or am I doing this? PS...I don't
have setitimer either with the kernel.

I am afraid your question is out of topic in this newsgroup. You may
want to try a newsgroup related to your particular kernel:
implementing the alarm() call in unlikely to be safely/rightly
implemented using only the C library (remember that C doesn't know
anything about recvfrom/threads and their supposed interaction with
SIGALRM).

If you are using recvfrom you'd better check for a (supposedly
available ?) timeout option when creating your socket or check you
select() system call with a timeout option, and do the recvfrom() only
when somtehing is available for this socket i.e. the fd is readable.
Of course everything written previously is a waste of time since you
don't even provide info on the kernel you are using and way out of
topic here

cheers,
Paulo

 

[Greg]

I am afraid your question is out of topic in this newsgroup. You may
want to try a newsgroup related to your particular kernel:
implementing thealarm() call in unlikely to be safely/rightly
implemented using only the C library (remember that C doesn't know
anything about recvfrom/threads and their supposed interaction with
SIGALRM).

If you are using recvfrom you'd better check for a (supposedly
available ?) timeout option when creating your socket or check you
select() system call with a timeout option, and do the recvfrom() only
when somtehing is available for this socket i.e. the fd is readable.
Of course everything written previously is a waste of time since you
don't even provide info on the kernel you are using and way out of
topic here

cheers,
Paulo

Many thanks. Select was what I was looking for. That accomplished
it. I am using the Xilinx kernel. Sorry for the mystery. Thanks for
the reply.