10-26-2007
Presumably because the shell itself still has both ends of both pipes still open.
Try adding
close(pipe_a[0]);
close(pipe_a[1]);
close(pipe_b[0]);
close(pipe_b[1]);
prior to your wait.
When your shell exits, these file descriptors get closed, hence allowing EOF to be read. EOF will never be read while there is a write end open.
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LEARN ABOUT DEBIAN
binfmtc-interpreter
binfmtc(1) binfmt_C binfmtc(1)
NAME
binfmtc-interpreter - binfmt_misc C handler
SYNOPSIS
binfmtc-interpreter C-source-file-name [command-line opions ...]
DESCRIPTION
binfmtc-interpreter compiles a C source file specified on the command-line using C compiler, and executes the resulting file.
It is designed to be used as a handler for binfmt_misc handler, which is a system used in Linux for handling arbitrary files as executa-
bles.
The command-line options are passed on to the compiled binary.
FILE MAGIC
There is a requirement for C source files to have the magic characters /*BINFMTC: at the beginning of the file.
That line also is used to specify the additional command-line options for C compiler.
ENVIRONMENT
GCC The compiler used. The default is to use gcc
CC The compiler used, if GCC variable is not set.
BINFMTCTMPDIR
Temporary directory used for binary and execution.
Falls back to $TMPDIR $TEMPDIR or /tmp
BINFMTC_DEBUG
enables debug output if set.
BINFMTC_GCC_OPTS
Additional GCC options. Use BINFMTC_DEBUG to verify the options being passed on to gcc.
The default is -O2 -Wall -g
AUTHOR
Junichi Uekawa (dancer@debian.org)
Upstream page is available at http://www.netfort.gr.jp/~dancer/software/
SEE ALSO
binfmtasm-interpreter(1), binfmtcxx-interpreter(1), binfmtf-interpreter(1), binfmtf95-interpreter(1), binfmtgcj-interpreter(1)
binfmt_misc Dancer 2009 Feb 8 binfmtc(1)