1.modifications:
modified:   syscall/fs_syscall.c
2.modify 2 testcases:
IO/full/IO_test_ppoll_001.cpp
IO/full/IO_test_ppoll_002.cpp
3.influence:
none
Signed-off-by: pef <cyd1997@126.com>
Change-Id: I85fc091098a6dfef1a4694a3bbc489640ee6dda2