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import errno
import fcntl
import os
import pty
import signal
import sys
import termios
def handler(sig, f):
pass
def create_eio_condition():
# SIGINT handler used to produce an EIO.
# See https://github.com/python/cpython/issues/135329.
try:
master_fd, slave_fd = pty.openpty()
child_pid = os.fork()
if child_pid == 0:
try:
os.setsid()
fcntl.ioctl(slave_fd, termios.TIOCSCTTY, 0)
child_process_group_id = os.getpgrp()
grandchild_pid = os.fork()
if grandchild_pid == 0:
os.setpgid(0, 0) # set process group for grandchild
os.dup2(slave_fd, 0) # redirect stdin
if slave_fd > 2:
os.close(slave_fd)
# Fork grandchild for terminal control manipulation
if os.fork() == 0:
sys.exit(0) # exit the child process that was just obtained
else:
try:
os.tcsetpgrp(0, child_process_group_id)
except OSError:
pass
sys.exit(0)
else:
# Back to child
try:
os.setpgid(grandchild_pid, grandchild_pid)
except ProcessLookupError:
pass
os.tcsetpgrp(slave_fd, grandchild_pid)
if slave_fd > 2:
os.close(slave_fd)
os.waitpid(grandchild_pid, 0)
# Manipulate terminal control to create EIO condition
os.tcsetpgrp(master_fd, child_process_group_id)
# Now try to read from master - this might cause EIO
try:
os.read(master_fd, 1)
except OSError as e:
if e.errno == errno.EIO:
print(f"Setup created EIO condition: {e}", file=sys.stderr)
sys.exit(0)
except Exception as setup_e:
print(f"Setup error: {setup_e}", file=sys.stderr)
sys.exit(1)
else:
# Parent process
os.close(slave_fd)
os.waitpid(child_pid, 0)
# Now replace stdin with master_fd and try to read
os.dup2(master_fd, 0)
os.close(master_fd)
# This should now trigger EIO
print(f"Unexpectedly got input: {input()!r}", file=sys.stderr)
sys.exit(0)
except OSError as e:
if e.errno == errno.EIO:
print(f"Got EIO: {e}", file=sys.stderr)
sys.exit(1)
elif e.errno == errno.ENXIO:
print(f"Got ENXIO (no such device): {e}", file=sys.stderr)
sys.exit(1) # Treat ENXIO as success too
else:
print(f"Got other OSError: errno={e.errno} {e}", file=sys.stderr)
sys.exit(2)
except EOFError as e:
print(f"Got EOFError: {e}", file=sys.stderr)
sys.exit(3)
except Exception as e:
print(f"Got unexpected error: {type(e).__name__}: {e}", file=sys.stderr)
sys.exit(4)
if __name__ == "__main__":
# Set up signal handler for coordination
signal.signal(signal.SIGUSR1, lambda *a: create_eio_condition())
print("READY", flush=True)
signal.pause()
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