Linux基础IO

1:C语言文件IO

C语言中的文件操作函数如下：

下面只会选择性对C语言的部分文件操作函数进行使用，若想详细了解其余文件操作函数的使用方法，请跳转到博主的其它博客：文件处理不再难:带你轻松攻克C语言文件操作_c语言大文件处理-CSDN博客

代码语言：javascript

AI代码解释

#include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <sys/wait.h> #include <stdlib.h> int main() { FILE * fp = fopen("log.txt","w"); if(NULL == fp) { perror("fopen"); exit(-1); } fclose(fp); fp = NULL; return 0; }

运行程序后，在当前路径下就会生成对应文件.

那么我们也可以通过输出重定向向文件里面写入新的内容.

1.1:对文件的初步理解

那么有了上面的简单例子我们可以对文件有一个简单的初步理解

• 打开文件,本质是进程在打开文件.
• 文件在没有被打开的时候,在什么地方上------->在磁盘上头.
• 进程能够同时打开很多文件.

系统中可以存在很多进程------------>很多情况下,OS内部,一定存在大量的被打开的文件---------->那么OS就要对这些被打开的文件进行处理,先描述,再组织------->因此可以推测,每一个被打开的文件在OS内部,一定要存在对应的描述文件属性的结构体,类似与PCB.

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