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open(2): Clarify non-POSIX error when opening a symlink with O_NOFOLLOW.

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We return [EMLINK] instead of [ELOOP] when trying to open a symlink with
O_NOFOLLOW, so that the original case of [ELOOP] can be distinguished. Code
like cmp -h and xz takes advantage of this.

PR:		214633
Reviewed by:	kib, imp
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D8586
This commit is contained in:
Jilles Tjoelker 2016-11-22 22:30:55 +00:00
parent e10312ca7b
commit 295159dfa3
1 changed files with 17 additions and 1 deletions
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18
lib/libc/sys/open.2
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@ -28,7 +28,7 @@
.\" @(#)open.2 8.2 (Berkeley) 11/16/93 .\" @(#)open.2 8.2 (Berkeley) 11/16/93
.\" $FreeBSD$ .\" $FreeBSD$
.\" .\"
.Dd September 30, 2016 .Dd November 22, 2016
.Dt OPEN 2 .Dt OPEN 2
.Os .Os
.Sh NAME .Sh NAME
@ -503,6 +503,22 @@ The
.Fn openat .Fn openat
function was introduced in function was introduced in
.Fx 8.0 . .Fx 8.0 .
.Sh STANDARDS
These functions are specified by
.St -p1003.1-2008 .
.Fx
sets
.Va errno
to
.Er EMLINK instead of
.Er ELOOP
as specified by
.Tn POSIX
when
.Dv O_NOFOLLOW
is set in flags and the final component of pathname is a symbolic link
to distinguish it from the case of too many symbolic link traversals
in one of its non-final components.
.Sh BUGS .Sh BUGS
The Open Group Extended API Set 2 specification requires that the test The Open Group Extended API Set 2 specification requires that the test
for whether for whether