access函数的使用检查文件的权限【学习笔记】

 1 #include "apue.h"
 2 #include <fcntl.h>
 3 
 4 
 5 int main(int argc,char **argv)
 6 {
 7     if(argc != 2)
 8         err_quit("usage:a.out <pathname>");
 9     if(access(argv[1],R_OK) < 0)
10         err_ret("access error for %s",argv[1]);
11     else
12         printf("read access OK\n");
13     if(open(argv[1],O_RDONLY)<0)
14         err_ret("open error for %s\r\n",argv[1]);
15     else
16         printf("open for reading OK\r\n");
17 
18     exit(0);
19 
20 
21     return 0;
22 }
23 ~