#!/usr/bin/env python

import sys
import os
import fcntl


def set_cloexec_flag(fd):
    try:
        cloexec_flag = fcntl.FD_CLOEXEC
    except AttributeError:
        cloexec_flag = 1

    old = fcntl.fcntl(fd, fcntl.F_GETFD)
    fcntl.fcntl(fd, fcntl.F_SETFD, old | cloexec_flag)


def run(args):
    c2pread, c2pwrite = os.pipe()
    errpipe_read, errpipe_write = os.pipe()
    set_cloexec_flag(errpipe_write)

    pid = os.fork()
    if pid == 0:
        # Child
        try:
            os.close(c2pread)
            os.close(errpipe_read)
            os.dup2(c2pwrite, 1)
            os.dup2(c2pwrite, 2)
            os.close(c2pwrite)
            os.execvp(args[0], args)

        except:
            os.write(errpipe_write, "1")
        os._exit(255)

    # Parent
    os.close(errpipe_write)
    os.close(c2pwrite)
    data = os.read(errpipe_read, 1048576) 
    os.close(errpipe_read)
    if data != "":
        print >>sys.stderr, "EXCEPTION IN CHILD"
        sys.exit(1)

    selfstdout = os.fdopen(c2pread, 'rb', 0)
    print "DATA:", repr(selfstdout.read())
    print "DATA:", repr(selfstdout.read()) 


args = [sys.executable, "-c",
        'import sys;' \
        'sys.stdout.write("apple");' \
        'sys.stdout.flush();' \
        'sys.stderr.write("orange")']

run(args)