implement under linux environment:1. copy of files 2. run 3 multi-thread application 3. add a new system_call.

1.1_copy
........\copy
........\copy.c
........\copy.c~
........\ss~
1.2_simul
.........\1
.........\1.c
.........\2
.........\2.c
.........\3
.........\3.c
.........\main
.........\main.c
2_syscall
.........\syscall.c
.........\test
.........\test.c
.........\test.c~

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