Fix Linux getcwd for long paths

The getcwd syscall (so far?) can only handle path up to one page
in size.  There is no limit about directory hierarchy depth, though,
and the POSIX getcwd is supposed to handle this.  In that case fall
back to the generic getcwd.

Additionally, optimize the generic getcwd to use openat when possible
to change the asymptotic performance from O(N^2) to O(n).

1 files changed, 2 insertions, 0 deletions

diff --git a/include/dirent.h b/include/dirent.h
index 4db63a626c..0f8f1cbe88 100644
--- a/include/dirent.h
+++ b/include/dirent.h
@@ -32,4 +32,6 @@ extern DIR *__alloc_dir (int fd, bool close_fd, int flags,
 			 const struct stat64 *statp)
      internal_function;
 
+libc_hidden_proto (rewinddir)
+
 #endif