c-language's People
c-language's Issues
ext2/ext3/ext4文件系统
命令查看linux系统支持的文件系统有哪些:ls -l /lib/modules/$(uname -r)/kernel/fs
操作系统导论笔记
- 虚拟化内存
- 内存就是一个字节数组,要读取内存,必须指定一个地址,才能访问存储在那里的数据,要写入或更新内存,还必须指定要写入给定地址的数据。
- 程序的每个指令都在内存中,因此每次读取指令都会访问内存。
制作标准库
库文件描述:
.a 表示静态库文件 .so 表示共享库文件
查看可执行程序链接的库文件
ldd program
bill.c
#include <stdio.h>
void bill(char *arg)
{
printf("bill: we passwed :[%s]\n", arg);
}
fred.c
#include <stdio.h>
void fred(int arg)
{
printf("fred: we passwd:[%d]\n", arg);
}
编译成 .o 文件
gcc -c bill.c fred.c
生成 bill.o fred.o 两个文件
将bill.c 与fred.c两个函数增加到lib.h头文件中
lib.h
void fred(int arg);
void bill(char *arg);
编写main函数
program.c
#include <stdio.h>
#include "lib.h"
int main()
{
bill("hello world");
fred(772652);
return 0;
}
生成 .o文件
gcc -c program.c
生成 program.o 文件
- 生成 program 可执行程序
gcc -o program program.o bill.o fred.o
./program
执行结果:
bill: we passwed :[hello world]
fred: we passwd:[772652]
- 制作库执行文件
ar crv libfoo.a bill.o fred.o
在有的操作系统中需要为函数库生成一个内容表
ranlib libfoo.a
2.1 生成 program 可执行程序
gcc -o program program.o libfoo.a
./program
执行结果:
bill: we passwed :[hello world]
fred: we passwd:[772652]
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