程序4-4 chmod函数实例

 //http://blog.chinaunix.net/uid-24549279-id-71355.html
 /*
  ============================================================================
  Name        : test.c
  Author      : blank
  Version     :
  Copyright   : Your copyright notice
  Description : 程序4-4 chmod函数实例
  ============================================================================
 */

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

 int main(int argc, char *argv[])
 {
     struct stat  buf;
     if (stat("foo", &buf) < ){
         err_sys("stat error for foo");
     }
     /*
      * turn on set-group-ID and turn off group-execute
      */
     if (chmod("foo", (buf.st_mode & ~S_IXGRP) | S_ISGID) < ){
         err_sys("chmod error for foo");
     }

     /*
      *set absolute mode to rw-r--r--
      */
     if (chmod("bar", (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) < ){
         err_sys("chmod error for bar");
     }
     exit();
 }