[cs631apue] Question about -a option

[Shicong Huang]

Hi,

I met a question when I tried to implement -a option. In the instruction,
-a shall include directory
entries whose names begin with a dot. If I am not wrong, I still need to
ignore file entries whose
names begin with a dot. So, consider this case:

ls -a /foo/bar/

foo's access permission: drwxrwxrwx
bar's access permission: drw-rw-rw-

Since I have "r" permission of bar, I can read all sub entries of it. But I
don't have any
"x" permission of bar, that means I can't stat(2) its sub entries. So, how
do I know a sub
entry is a directory?


Thanks!

Shicong Huang
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