1.3

1.3.1 1.3.2 1.3.3 1.3.4

1.3.1

I/O :,,

1.3.2

:

(1)

(2)

APIApplication Programming InterfaceSystem Call)

(3)

(C)

(4)

(5) UNIX/Linux

(6)()()

(7) WindowsAPI Kernel User GDI WindowsDLL

(8) Win32APIUNIX/Linux

1.3.3 (1)1. (1) (2) (3) (4) (5) (6)

(2) 2.

. . .

(3)

(4) CPU

(5)

(6)Linux Linux () API,Linuxlib.a

(7)Linuxentry.sENTRY(sys-call-table) .long SYMBOL-NAME(sys-ni-syscall) 0 .long SYMBOL-NAME (sys-exit) 1 .long SYMBOL-NAME (sys-fork) 2 .long SYMBOL-NAME (sys-read) 3 .long SYMBOL-NAME (sys-write) 4 .long SYMBOL-NAME (sys-open) 5 .long SYMBOL-NAME(sys-close) 6 .long SYMBOL-NAME (sys-vfork ) 190

(8) Linux,Linux0x80(int80h)

(9) Linux (1) (2) (3) (4) (5) (6)scheduler

(10)()

1.3.4 (1)

()()()

(2)

1. ()

While (TRUE) { /*TRUE=1,*/ type-prompt( ); /**/ read-command(command,parameters); /**/ pid=fork( ); /**/ if(pid

(1)

(2)

UNIXShell(1)Shell Myrun cat $1 /* */ cc $1 /* */ mv a.out $2 /*$2*/ $2 /*$2*/ csh myrun prog1.c prog prog1.cprog

UNIXShell(2)UNIX Shell /user/user1/feiprocessthreadShellfeipro for i do grep $i/usr/usr1/fei done csh feipro process threadprocessthread

MS-DOS testbat echo off if exist %1 goto lab1 echo %1 not found! goto lab2 lab1 echo %1 is found! lab2 test wpsexe wpsexe is found! wps.exe not found!

JCL Job Control Language JCL() JCL

IBM JCL(1) JCL:

IBM JCL(2)// HAROLD JOB,WILSON,MSGLEVEL=(2,0),PRTY=6,CLASS=b// COMP EXEC PGM=IEYFORT// SYSPRINT DD SYSOUT=A// SYSIN DD* . . /*// GO EXEC PGM=FORTLINK// SYSPRINT DD SYSOUT=A// FTOTF001 DD UNIT=SYSCP// GO SYSIN DD* . ./*//

2.

CPU

3(1)Utilities

(2)

UNIXPOSIX1003.1UNIXUNIXUNIX

UNIXUNIXPOSIX1003.1,I/O,C,CReadRead

UNIX(1)UNIX() POSIX1003.2

UNIX(2)UNIXUNIX1000UNIX

(6) UNIX

CH-7CH-8CH-8