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Not sure if it's useful, but my Luvit project has a fully non-blocking
popen with full I/O streams for stdin, stdout, and stderr as well as
events for process exit and/or signal termination.  Just don't try to
use luvit as a library to your existing lua program.  luvit is it's
own runtime (that embeds luajit) and makes many assumptions.


On Tue, Dec 6, 2011 at 4:17 PM, Peter Odding <> wrote:
>> We are running an external process using io.popen(). Something like ...
>>  ecom = assert(io.popen(cmd, 'r'))
>> Is there a way to setup non-blocking reads with this type of interface?
>> Or do other lua modules offer more control? What we've seen is that our
>> read() command will block if the external process does not have any data
>> to return. We need a strategy to make this non-blocking.
>> Thanks for any suggestions,
>> Joe
> I don't know whether it's possible or easy to make pipes created by
> io.popen() non-blocking, however my Lua/APR binding [1] supports process
> management and pipes with configurable blocking behaviour (non-blocking,
> blocking and blocking with time out). It works in Windows and UNIX
> environments (and then some).
>  - Peter
> [1]