linux下c語言實現檔案拷貝
/*function:copy file from file1 to file2
how to execute: ./copyfile file1 file2 (under linux)
data:2007-05-09
*/#include /*fprintf(),stderr,bufsiz*/
#include /**/
#include /*stderror()*/
#include /*open(),flag*/
#include /*errno*/
#include /*ssize_t*/
#include
#include /*mode_t*/
#define buffer_size 3
int main(int argc,char **argv)
/* 開啟原始檔 */
if((from_fd=open(argv[1],o_rdonly))==-1) /*open file readonly,返回-1表示出錯，否則返回檔案描述符*/
/* 建立目的檔案 */
/* 使用了o_creat選項-建立檔案,open()函式需要第3個引數,
mode=s_irusr|s_iwusr表示s_irusr 使用者可以讀 s_iwusr 使用者可以寫*/
if((to_fd=open(argv[2],o_wronly|o_creat,s_irusr|s_iwusr))==-1)
/* 以下**是乙個經典的拷貝檔案的** */
while(bytes_read=read(from_fd,buffer,buffer_size))
}/* 寫的時候發生的致命錯誤 */
if(bytes_write==-1)
break;}}
close(from_fd);
close(to_fd);
return;
}
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