[mpich-discuss] Redirection and Pipes

[Diego Fernández Slezak]

Hello,

I have a working code that redirects stdout to a pipe, runs some code and
then process the stdout (through the pipe):


/// Connect STDOUT to pipe
 // Save old stdout.
saved_stdout = dup(STDOUT_FILENO);  // save stdout for display later
 // create pipe
if( pipe(out_pipe) != 0 ) {          // make a pipe
exit(1);
 }
// connect stdout to pipe.
dup2(out_pipe[1], STDOUT_FILENO);   // redirect stdout to the pipe

...
...
//at some point:
int read_bytes = read(out_pipe[0], buffer, MAX_LEN); // read from pipe into
buffer

...
...

dup2(saved_stdout, STDOUT_FILENO);  // reconnect stdout for testing


Now, if I try to run exactly the same code in MPI environment, the "read"
function only retrieves part of the message.
I think this could be because of some MPI redefinition of pipe buffer sizes
or similar.

Any ideas?

Thanks
Diego
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/mpich-discuss/attachments/20100820/34f7e181/attachment.htm>