[erlang-questions] spawn/4 problem

[jaiswal.vikash@REDACTED]

Hi ,
 
I've developed an application which uses spawn/4 .But at some instances
the pid returned by it is a dummy one i.e. that pid does not exist in
reality.(i checked it using pman:start().  ). Due to this ,  my
application is going into a hanged state  i.e it is sending some message
o the spawned process but not getting any response from it .It is simply
waiting for the response .
 
Could anyone please tell me how I can check whether the pid is real one
or just a dummy ?
Also how can I trap the exit signal sent by spawn/4 ? 
 
Also , when I execute this line in the erl prompt it is working fine but
when I include it in a file I 'm getting the error .
         Pid = spawn('abc@REDACTED', my_file, start, []),
         erlang:is_process_alive(Pid),
The above works  well in erl  prompt but gives the following error when
included in the file 
         =ERROR REPORT==== 9-Mar-2007::14:05:19 ===
Error in process <0.30.0> on node 'abc@REDACTED' with exit value:
{badarg,[{erlang,is_process_alive,[<5064.11526.6>]},{erl_eval,do_apply,5
},{shell,eval_loop,2}]}
 
** exited: {badarg,[{erlang,is_process_alive,[<5064.11526.6>]},
                    {erl_eval,do_apply,5},
                    {shell,eval_loop,2}]} **
  
 
Thanks in advance .
 
Regards ,
Vikash



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