c示例

//copy_block

#include<unistd.h>

#include<sys/types.h>

#include<sys/stat.h>

#include<fcntl.h>

#include<stdio.h>

#include<stdlib.h>

int main(){

char c;

char block[1024];

int in,out,n;

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

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

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

write(out,block,n);

exit(EXIT_SUCCESS);

}