access函数的使用检查文件的权限【学习笔记】

 #include "apue.h"
 #include <fcntl.h>

 int main(int argc,char **argv)
 {
     if(argc != )
         err_quit("usage:a.out <pathname>");
     if(access(argv[],R_OK) < )
         err_ret("access error for %s",argv[]);
     else
         printf("read access OK\n");
     if(open(argv[],O_RDONLY)<)
         err_ret("open error for %s\r\n",argv[]);
     else
         printf("open for reading OK\r\n");

     exit();

     return ;
 }
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