From 39120df9b9e2ad9674c0d6265757a7a68e10051f Mon Sep 17 00:00:00 2001 From: Patsy Franklin Date: Wed, 6 Mar 2013 12:54:10 -0500 Subject: T_REMOVEDIR and AT_EACCESS have the same value. Add comments to fcntl.h explaining why AT_REMOVEDIR and AT_EACCESS can have the same value. --- io/fcntl.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'io/fcntl.h') diff --git a/io/fcntl.h b/io/fcntl.h index 61834ce..14ccae0 100644 --- a/io/fcntl.h +++ b/io/fcntl.h @@ -129,6 +129,12 @@ typedef __pid_t pid_t; # define SEEK_END 2 /* Seek from end of file. */ #endif /* XPG */ +/* The constants AT_REMOVEDIR and AT_EACCESS have the same value. AT_EASSESS + is meaningful only to faccessat, while AT_REMOVEDIR is meaningful only to + unlinkat. The two functions do completely different things and therefore, + the flags can be allowed to overlap. For example, passing AT_REMOVEDIR to + faccessat would be undefined behavior and thus treating it equivalent to + AT_EACCESS is valid undefined behavior. */ #ifdef __USE_ATFILE # define AT_FDCWD -100 /* Special value used to indicate the *at functions should use the -- cgit v1.1