What's the equivalent of readdirat()?

What's the equivalent of readdirat()?

[Rob Landley]

I'm moving some code to use openat() and friends, but there doesn't appear to 
be a readdirat().

The problem is that readdir(3) takes a path from cwd.  The syscall readdir(2) 
takes a file descriptor, but the man page for readdir(2) says it was 
supplanted by getdents.  The getdents man page says that's an internal 
syscall that glibc doesn't even bother to _wrap_, and points me back at 
readdir(3) which still takes a path from cwd...

None of the "see also" stuff at the end of any of these pages is useful.

Any hints?

Rob
-- 
"One of my most productive days was throwing away 1000 lines of code."
  - Ken Thompson.

Re: What's the equivalent of readdirat()?

[Sam Varshavchik]

[-- Attachment #1: Type: text/plain, Size: 442 bytes --]

Rob Landley writes:

> I'm moving some code to use openat() and friends, but there doesn't appear to 
> be a readdirat().
> 
> The problem is that readdir(3) takes a path from cwd.

No, it doesn't. readdir() takes an existing DIR pointer, that was previously 
returned by opendir(3).

You will note that the opendir(3) man page also described an alternative 
fdopendir() function, which in conjunction with openat(3) will do what you 
want.


[-- Attachment #2: Type: application/pgp-signature, Size: 189 bytes --]