mycp

#include<unistd.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<fcntl.h>
#include<stdlib.h>
#include<string.h>
#include<stdio.h>
#define SIZE 8192
int main(int argc,char *argv[]){

    char buf[SIZE];
    int fd_src,fd_desc,len;
    if(argc<3){
        printf("./mycp src dest\n");
        exit(1);
    }

    fd_src=open(argv[1],O_RDONLY);
    fd_desc=open(argv[2],O_CREAT | O_WRONLY | O_TRUNC,0644);

    while((len=read(fd_src,buf,sizeof(buf)))>0){
        write(fd_desc,buf,len);
    }
    close(fd_src);
    close(fd_desc);
    return 0;
}