實驗要求

使用系統呼叫(open, read, write,close等函式)編寫檔案拷貝程式.

實驗環境

Linux或Max OS X

實驗程式碼

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

int main(int argc, char** argv){
    if(argc != 3
 
){
        fprintf(stderr, "You must need a source file and destination file\n");
        exit(0);
    }
    int so = open(argv[1], O_RDONLY|O_CREAT, 0644);
    int de = open(argv[2], O_WRONLY|O_CREAT, 0644);
    char c;
    while(read(so, &c, 1)){
        write(de, &c, 1);
    }
    close(so);
    close(de);
    printf
 
("copy over\n");
    return 0;
}