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authorPatsy Franklin <pfrankli@redhat.com>2013-03-06 12:54:10 -0500
committerPatsy Franklin <pfrankli@redhat.com>2013-03-06 13:39:16 -0500
commit39120df9b9e2ad9674c0d6265757a7a68e10051f (patch)
treeddef45a58945fed230d26a155bbc10739b3fa864 /io/fcntl.h
parent664a9ce4ca40feabff781fff044c93a43ae15b59 (diff)
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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.
Diffstat (limited to 'io/fcntl.h')
-rw-r--r--io/fcntl.h6
1 files changed, 6 insertions, 0 deletions
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