Linux下程式（C語言）實現對檔案的複製

目標： 使用系統呼叫實現cp命令。

原理： 使用系統呼叫open開啟檔案，使用read從檔案讀資料，使用write向檔案寫資料。

傳給可執行程式的引數個數存放在main函式的argc中，引數首位址存放在指標陣列argv中。

我的**1：

#include #include #include #include #include int main(int argc,char *argv)

int fr = open(argv[1],o_rdonly,0777);
int fw = open(argv[2],o_wronly|o_creat,0777);
if(fr < 0)
if(fw < 0)		
char str[20];
int count;
while((count = read(fr,str,20)) > 0)//每次讀取20個字元
close(fr);
close(fw);
return 0;
}

#include#include#include#include#include#includeint main(int argc, char *argv)

fd_new = open(argv[2],o_rdwr|o_creat,0755);
if(fd_new<0)
lseek(fd,0,seek_set);
length = lseek(fd,0,seek_end);
buf = (char *)malloc(length+1);
lseek(fd,0,seek_set);
read(fd,buf,length);
write(fd_new,buf,length);
close(fd);
close(fd_new);
return 0;
}

#include #include #include #include int main(int argc, char *argv)

fd_dest = open(argv[2], o_wronly|o_creat, 0755);
if(fd_dest < 0)
char buf[1024] = "";
dowhile(ret >0);
close(fd_src);
close(fd_dest);
}	return 0;
}

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