linux1.0 the source, okay own size up situation and act accordingly, but there's also a few good examples

example
.......\第10章 Shell编程技术和实例
.......\..........................\dup.c
.......\..........................\forkdup.c
.......\..........................\sh1.c
.......\..........................\sh2.c
.......\..........................\t_shell
.......\..........................\.......\check.c
.......\..........................\.......\command.c
.......\..........................\.......\def.h
.......\..........................\.......\execute.c
.......\..........................\.......\forkexec.c
.......\..........................\.......\getline.c
.......\..........................\.......\getname.c
.......\..........................\.......\init.c
.......\..........................\.......\main.c
.......\..........................\.......\parse.c
.......\第11章 系统调用实现
.......\...................\doprintf.c
.......\...................\stand_lib.c
.......\...................\sys.c
.......\第12章 Linux网络实现分析
.......\........................\ringbuf.c
.......\........................\sc.c
.......\........................\sw.c
.......\........................\timer.c
.......\第1章 GNU和Linux简介
.......\第2章 操作系统设计入门
.......\第3章 操作系统设计基本技术
.......\..........................\cpuinfo.c
.......\..........................\cpuinfo.exe
.......\..........................\cursor.c
.......\..........................\hello-linux
.......\..........................\...........\hello.asm
.......\..........................\hello-masm
.......\..........................\..........\hello.asm
.......\..........................\..........\HELLO.EXE
.......\..........................\hello-nasm
.......\..........................\..........\hello.asm
.......\..........................\hello_s.c
.......\第4章 Linux0.01内核简介
.......\第5章 操作系统的引导
.......\....................\boot.asm
.......\....................\hang.asm
.......\....................\jump.asm
.......\....................\prog.asm
.......\....................\REBOOT.C
.......\第6章 存储管理分析设计
.......\......................\biosmem.asm
.......\......................\malloc.c
.......\......................\memory.c
.......\第7章 进程管理和调度
.......\....................\cmtask.c
.......\....................\fork.c
.......\....................\kill.c
.......\....................\psw.c
.......\....................\sched.c
.......\....................\system_call.s
.......\第8章 设备管理
.......\..............\bddrv.c
.......\..............\biostest.c
.......\..............\clock.c
.......\..............\df.c
.......\..............\isr_clock.s
.......\..............\KBD.C
.......\第9章 Linux磁盘文件系统
.......\.......................\bitmap.c
.......\.......................\buffer.c
.......\.......................\fs.c
.......\.......................\inode.c
.......\.......................\open.c
.......\.......................\read_write.c
.......\.......................\super.c

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