1 #define SYS_fork 1 2 #define SYS_exit 2 3 #define SYS_wait 3 4 #define SYS_pipe 5 5 #define SYS_write 6 6 #define SYS_read 7 7 #define SYS_close 8 8 #define SYS_block 9 9 #define SYS_kill 10 10 #define SYS_exec 13 11 #define SYS_open 14 12 #define SYS_mknod 15 13 #define SYS_unlink 16 14 #define SYS_fstat 17 15 #define SYS_link 18 16 #define SYS_mkdir 19 17 #define SYS_chdir 20 18 19