S_IXOTH

1

Execute by others

S_IWOTH

2

Write by others

S_IROTH

4

Read by others

S_IXGRP

8

Execute by group

S_IWGRP

16

Write by group

S_IRGRP

32

Read by group

S_IXUSR

64

Execute by owner

S_IWUSR

128

Write by owner

S_IRUSR

256

Read by owner

S_ISVTX

512

Sticky bit

S_ISGID

1024

Set group ID on execution

S_ISUID

2048

Set user ID on execution