1 //http://blog.chinaunix.net/uid-24549279-id-71355.html 2 /* 3 ============================================================================ 4 Name : test.c 5 Author : blank 6 Version : 7 Copyright : Your copyright notice 8 Description : 程序4-4 chmod函数实例 9 ============================================================================ 10 */ 11 12 #include <fcntl.h> 13 #include "ourhdr.h" 14 15 int main(int argc, char *argv[]) 16 { 17 struct stat buf; 18 if (stat("foo", &buf) < 0){ 19 err_sys("stat error for foo"); 20 } 21 /* 22 * turn on set-group-ID and turn off group-execute 23 */ 24 if (chmod("foo", (buf.st_mode & ~S_IXGRP) | S_ISGID) < 0){ 25 err_sys("chmod error for foo"); 26 } 27 28 /* 29 *set absolute mode to rw-r--r-- 30 */ 31 if (chmod("bar", (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) < 0){ 32 err_sys("chmod error for bar"); 33 } 34 exit(0); 35 }