linux 底层文件访问(库函数)

最新推荐文章于 2024-02-04 19:51:08 发布

querdaizhi

最新推荐文章于 2024-02-04 19:51:08 发布

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分类专栏： LINUX 文章标签： linux buffer

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write系统调用

#include<unistd.h>
#include<stdlib.h>

int main()
{
        if( (write(1,"here\n",6) !=6))
        {
                write(2,"WRONG",5);
        }
        exit(0);
}

read系统调用

#include<unistd.h>
#include<stdlib.h>

int main()
{
        char buffer[128];
        int nread;

        nread = read(0,buffer,128);
        if(-1 == nread)
        {
                write(2,"read WRONG",10);
        }
        if( ( write(1,buffer,nread) )!= nread )
        {
                write(2,"A write error",13);
        }
        exit(0);
}

open 系统调用

#include<fcntl.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<unistd.h>
#include<stdlib.h>

int main()
{
        open("open.txt",O_CREAT,S_IRUSR|S_IXOTH);
        exit(0);
}