1 #define SYS_fork 1 2 #define SYS_exit 2 3 #define SYS_wait 3 4 #define SYS_pipe 4 5 #define SYS_write 5 6 #define SYS_read 6 7 #define SYS_close 7 8 #define SYS_kill 8 9 #define SYS_exec 9 10 #define SYS_open 10 11 #define SYS_mknod 11 12 #define SYS_unlink 12 13 #define SYS_fstat 13 14 #define SYS_link 14 15 #define SYS_mkdir 15 16 #define SYS_chdir 16 17 #define SYS_dup 17 18 #define SYS_getpid 18 19 #define SYS_sbrk 19 20 21