Function written in C, hangs on one machine and not another...

PostgreSQL 7.4 ...

Essentially, I've written a function in C for use with PostgreSQL. The debugger
shows that the program is hanging on the part of the program that is writing
data into it's own STDIN.

[snip]

// Open up and hijack STDIN
int pipe_pair[2];
int pipe_rv = pipe(pipe_pair);
if (pipe_rv != 0)
// Abort! Abort!
{
close(pipe_pair[1]);
pfree(param_1);
pfree(param_2);
PG_RETURN_NULL();
}

int newfd = dup2(pipe_pair[0],STDIN_FILENO);
if (newfd != 0)
// Abort! Abort!
{
close(pipe_pair[1]);
pfree(param_1);
pfree(param_2);
PG_RETURN_NULL();
}

// Write param_1 to hijacked pipe
write(pipe_pair[1], param_1, param_1_len); // Hangs here...

[/snip]

It works on the machine I use for testing from within PostgreSQL, but it
doesn't work on the machine which is the production server. I'd hate for this
to matter, but I ought to disclose that testing machine is a 1-way AMD Box with
a more recent version of the Linux 2.6 kernel, and a more recent version of
libc. The production machine is a 2-way Dell Xeon processor. Same version of
PostgreSQL, compiled with the same flags (except with debugging symbols for the
testing machine). You'd, or at least I would, think simple code like this would
compile and run on multiple platforms...

I can perform the same STDIN hijacking on both machines in a standalone
program, but it fails under PostgreSQL.

I'm completely stumped, and I need YOUR insight! Thank you!!

CGV

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