text: #ifndef _SYSCALL_H_
  #define _SYSCALL_H_
  
  // System call numbers
  #define SYS_fork    1
  #define SYS_exit    2
  #define SYS_wait    3
  #define SYS_pipe    4
  #define SYS_write   5
  #define SYS_read    6
  #define SYS_close   7
  #define SYS_kill    8
  #define SYS_exec    9
  #define SYS_open   10
  #define SYS_mknod  11
  #define SYS_unlink 12
  #define SYS_fstat  13
  #define SYS_link   14
  #define SYS_mkdir  15
  #define SYS_chdir  16
  #define SYS_dup    17
  #define SYS_getpid 18
  #define SYS_sbrk   19
  #define SYS_sleep  20
  #define SYS_uptime 21
  #define SYS_shmem_access 22
  #define SYS_shmem_count  23
  #endif // _SYSCALL_H_
  