add support 4g -- >ppp

hc

2023-11-24 2b26ab132d1b33b91c84c6d732456200e8c5ee77

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dscr_default_test
dscr_explicit_test
dscr_inherit_exec_test
dscr_inherit_test
dscr_sysfs_test
dscr_sysfs_thread_test
dscr_user_test