extern int sys_setup ();	// ϵͳʼú (kernel/blk_drv/hd.c,71)
extern int sys_exit ();		// ˳ (kernel/exit.c, 137)
extern int sys_fork ();		// ̡ (kernel/system_call.s, 208)
extern int sys_read ();		// ļ (fs/read_write.c, 55)
extern int sys_write ();	// дļ (fs/read_write.c, 83)
extern int sys_open ();		// ļ (fs/open.c, 138)
extern int sys_close ();	// رļ (fs/open.c, 192)
extern int sys_waitpid ();	// ȴֹ (kernel/exit.c, 142)
extern int sys_creat ();	// ļ (fs/open.c, 187)
extern int sys_link ();		// һļӲӡ (fs/namei.c, 721)
extern int sys_unlink ();	// ɾһļ(ɾļ) (fs/namei.c, 663)
extern int sys_execve ();	// ִг (kernel/system_call.s, 200)
extern int sys_chdir ();	// ĵǰĿ¼ (fs/open.c, 75)
extern int sys_time ();		// ȡǰʱ䡣 (kernel/sys.c, 102)
extern int sys_mknod ();	// /ַļ (fs/namei.c, 412)
extern int sys_chmod ();	// ޸ļԡ (fs/open.c, 105)
extern int sys_chown ();	// ޸ļ顣 (fs/open.c, 121)
extern int sys_break ();	// (-kernel/sys.c, 21)
extern int sys_stat ();		// ʹ·ȡļ״̬Ϣ (fs/stat.c, 36)
extern int sys_lseek ();	// ¶λ/дļƫơ (fs/read_write.c, 25)
extern int sys_getpid ();	// ȡid (kernel/sched.c, 348)
extern int sys_mount ();	// װļϵͳ (fs/super.c, 200)
extern int sys_umount ();	// жļϵͳ (fs/super.c, 167)
extern int sys_setuid ();	// ýûid (kernel/sys.c, 143)
extern int sys_getuid ();	// ȡûid (kernel/sched.c, 358)
extern int sys_stime ();	// ϵͳʱڡ (-kernel/sys.c, 148)
extern int sys_ptrace ();	// ԡ (-kernel/sys.c, 26)
extern int sys_alarm ();	// ñ (kernel/sched.c, 338)
extern int sys_fstat ();	// ʹļȡļ״̬Ϣ(fs/stat.c, 47)
extern int sys_pause ();	// ͣС (kernel/sched.c, 144)
extern int sys_utime ();	// ıļķʺ޸ʱ䡣 (fs/open.c, 24)
extern int sys_stty ();		// ޸նá (-kernel/sys.c, 31)
extern int sys_gtty ();		// ȡնϢ (-kernel/sys.c, 36)
extern int sys_access ();	// ûһļķȨޡ(fs/open.c, 47)
extern int sys_nice ();		// ýִȨ (kernel/sched.c, 378)
extern int sys_ftime ();	// ȡںʱ䡣 (-kernel/sys.c,16)
extern int sys_sync ();		// ͬٻ豸ݡ (fs/buffer.c, 44)
extern int sys_kill ();		// ֹһ̡ (kernel/exit.c, 60)
extern int sys_rename ();	// ļ (-kernel/sys.c, 41)
extern int sys_mkdir ();	// Ŀ¼ (fs/namei.c, 463)
extern int sys_rmdir ();	// ɾĿ¼ (fs/namei.c, 587)
extern int sys_dup ();		// ļ (fs/fcntl.c, 42)
extern int sys_pipe ();		// ܵ (fs/pipe.c, 71)
extern int sys_times ();	// ȡʱ䡣 (kernel/sys.c, 156)
extern int sys_prof ();		// ִʱ (-kernel/sys.c, 46)
extern int sys_brk ();		// ޸ݶγȡ (kernel/sys.c, 168)
extern int sys_setgid ();	// ýid (kernel/sys.c, 72)
extern int sys_getgid ();	// ȡid (kernel/sched.c, 368)
extern int sys_signal ();	// źŴ (kernel/signal.c, 48)
extern int sys_geteuid ();	// ȡЧûid (kenrl/sched.c, 363)
extern int sys_getegid ();	// ȡЧid (kenrl/sched.c, 373)
extern int sys_acct ();		// ̼ʡ (-kernel/sys.c, 77)
extern int sys_phys ();		// (-kernel/sys.c, 82)
extern int sys_lock ();		// (-kernel/sys.c, 87)
extern int sys_ioctl ();	// 豸ơ (fs/ioctl.c, 30)
extern int sys_fcntl ();	// ļ (fs/fcntl.c, 47)
extern int sys_mpx ();		// (-kernel/sys.c, 92)
extern int sys_setpgid ();	// ýid (kernel/sys.c, 181)
extern int sys_ulimit ();	// (-kernel/sys.c, 97)
extern int sys_uname ();	// ʾϵͳϢ (kernel/sys.c, 216)
extern int sys_umask ();	// ȡĬļ롣 (kernel/sys.c, 230)
extern int sys_chroot ();	// ıϵͳ (fs/open.c, 90)
extern int sys_ustat ();	// ȡļϵͳϢ (fs/open.c, 19)
extern int sys_dup2 ();		// ļ (fs/fcntl.c, 36)
extern int sys_getppid ();	// ȡid (kernel/sched.c, 353)
extern int sys_getpgrp ();	// ȡidgetpgid(0)(kernel/sys.c, 201)
extern int sys_setsid ();	// »Ựг (kernel/sys.c, 206)
extern int sys_sigaction ();	// ıźŴ̡ (kernel/signal.c, 63)
extern int sys_sgetmask ();	// ȡź롣 (kernel/signal.c, 15)
extern int sys_ssetmask ();	// ź롣 (kernel/signal.c, 20)
extern int sys_setreuid ();	// ʵ/Чûid (kernel/sys.c,118)
extern int sys_setregid ();	// ʵ/Чid (kernel/sys.c, 51)

// ϵͳúָϵͳжϴ(int 0x80)Ϊת
fn_ptr sys_call_table[] = { sys_setup, sys_exit, sys_fork, sys_read,
  sys_write, sys_open, sys_close, sys_waitpid, sys_creat, sys_link,
  sys_unlink, sys_execve, sys_chdir, sys_time, sys_mknod, sys_chmod,
  sys_chown, sys_break, sys_stat, sys_lseek, sys_getpid, sys_mount,
  sys_umount, sys_setuid, sys_getuid, sys_stime, sys_ptrace, sys_alarm,
  sys_fstat, sys_pause, sys_utime, sys_stty, sys_gtty, sys_access,
  sys_nice, sys_ftime, sys_sync, sys_kill, sys_rename, sys_mkdir,
  sys_rmdir, sys_dup, sys_pipe, sys_times, sys_prof, sys_brk, sys_setgid,
  sys_getgid, sys_signal, sys_geteuid, sys_getegid, sys_acct, sys_phys,
  sys_lock, sys_ioctl, sys_fcntl, sys_mpx, sys_setpgid, sys_ulimit,
  sys_uname, sys_umask, sys_chroot, sys_ustat, sys_dup2, sys_getppid,
  sys_getpgrp, sys_setsid, sys_sigaction, sys_sgetmask, sys_ssetmask,
  sys_setreuid, sys_setregid
};
