syscall.h

#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    9
#define SYS_exec   10
#define SYS_open   11
#define SYS_mknod  12
#define SYS_unlink 13
#define SYS_fstat  14
#define SYS_link   15
#define SYS_mkdir  16
#define SYS_chdir  17
#define SYS_dup    18
#define SYS_getpid 19
#define SYS_sbrk   20