apue umask 练习
1 #include <sys/stat.h> 2 #include <unistd.h> 3 #include <stdlib.h> 4 #include <fcntl.h> 5 #include <stdio.h> 6 7 #define RWRWRW (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH) 8 int main(int argc, char const *argv[]) 9 { 10 11 umask(0); 12 creat("foo",RWRWRW); 13 umask( S_IRGRP | S_IWUSR | S_IROTH | S_IWOTH); 14 creat("bar",RWRWRW); 15 printf("S_IRUSR = %d S_IWUSR= %d S_IRGRP= %d S_IWGRP = %d S_IROTH = %d S_IWOTH = %d RWRWRW=%d \n" ,\ 16 S_IRUSR, S_IWUSR, S_IRGRP, S_IWGRP ,S_IROTH, S_IWOTH, RWRWRW); 17 exit(0); 18 }
执行结果
[root@MiWiFi-R3-srv apue test]# ./unmaskt
S_IRUSR = 256 S_IWUSR= 128 S_IRGRP= 32 S_IWGRP = 16 S_IROTH = 4 S_IWOTH = 2 RWRWRW=438
[root@MiWiFi-R3-srv apue test]# ll bar foo
-r---w----. 1 root root 0 Aug 10 03:56 bar
-rw-rw-rw-. 1 root root 0 Aug 10 03:56 foo
