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1. the getpgid function can help to pass the ltp/open_posix_testsuite/killpg related testcases 2. NuttX do not support process group, so we use the process id as process group id 3. the implementation are referred to: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getpgid.html Signed-off-by: guoshichao <guoshichao@xiaomi.com>