[Mono-list] using pipes with mono

[raduM]

I am trying to use unamed pipes to communicate between a gui written with
GTK# and a C program. I run the following on the C# side:

int [] pipe_fds = new int[2];
Syscall.pipe (pipe_fds);
string arguments = pipe_fds[0] + "-" + pipe_fds[1]
Process.Start("myexe", arguments);

And than on the C side:

int pipe_fds[2] = {0, 0};
// .. parse argv, get file descriptors
FILE* pipe_stream = 0;
pipe_stream = fdopen (pipe_fds[1], "w");

The moment the last line is executed, my program crashes. In the debugger,
mdb shows:
Thread @1 received signal 15 at #0

I do not understand what am I doing wrong? 
Thank you, Radu
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