Linux练习（系统调用复制文件）

#include <unistd.h>

#include <fcntl.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <stdlib.h>



int main()

{

        char block[1024];

        int in,out;

        int nread;



        in=open("file.in",O_RDONLY);

        out=open("file.out",O_WRONLY|O_CREAT,S_IRUSR|S_IWUSR);

        while ((nread=read(in,block,sizeof(block)))>0)

                write(out,block,nread);

        exit(0);



}