Hi,
I wanted to see if anyone had an idea about why the following program
results in an exception. The issue seems to be related to stdin to a
POSIX file descriptors for a subprocess, and GHC's Unicode encoding
lookup. I've tried to make the program as simple as possible to make
the issue obvious.
Consider:
> module Pipe where
>
> import System.Process
> import System.IO
> import System.Posix.IO
>
> main = sequence_ $ replicate 100000 f
>
> f = do
> (Just hin, _, _, prc) <-
> createProcess (shell "./pipe_c.out") { std_in = CreatePipe
> , std_out = UseHandle stdout
> , std_err = UseHandle stderr}
>
> pin <- handleToFd hin
> _ <- fdWrite pin ("h\n")
> closeFd pin
> waitForProcess prc
and a trivial C program to read in the data (but doing nothing with it):
---------------------------------------
#include <stdio.h>
#define SIZE 10
int main(void) {
char in[SIZE];
if(fgets(in, SIZE , stdin) != NULL);
return 0;
}
----------------------------------------
and executing
> gcc -Wall -o pipe_c.out pipe_c.c
> ghci Pipe.hs
> main
...
*** Exception: malloc: resource exhausted (out of memory)
iconvOpen ("UTF-8","UTF-8"): resource exhausted (Cannot allocate memory)
My best guess is that the GHC is calling iconv_open()
<http://www.kernel.org/doc/man-pages/online/pages/man3/iconv_open.3.html>,
but not making a subsequent call to iconv_close()
<http://www.kernel.org/doc/man-pages/online/pages/man3/iconv_close.3.html>.
(Actually, my best guess is I'm making a silly mistake, but I'm
having trouble seeing it. :) )
I am running 2.6.35-28-generic (Ubuntu) and GHC 7.0.2, but I've
observed the same issues with GHC 6.12.3.
Lee
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