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open_fds = set()
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for _ in range(40):
fd = os.open(os.devnull, os.O_RDONLY)
open_fds.add(fd)
# Leave a two pairs of low ones available for use by the
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for fd in sorted(open_fds)[:14]:
os.close(fd)
open_fds.remove(fd)
for fd in open_fds:
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os.set_inheritable(fd, True)
max_fd_open = max(open_fds)
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print(','.join(map(str, sorted(open_fds))))
sys.stdout.flush()
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# 29 is lower than the highest fds we are leaving open.
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subprocess.Popen(
[sys.executable, '-c',
textwrap.dedent("""
import subprocess, sys
subprocess.Popen([sys.executable, %r] +
[str(x) for x in range({max_fd})],
close_fds=True).wait()
""".format(max_fd=max_fd_open+1))],
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