git: ef2f36be8fce - main - jail.2: Mention EPERM is returned on open directories

The branch main has been updated by olce:

URL: https://cgit.FreeBSD.org/src/commit/?id=ef2f36be8fce8cf7a62ce7d33ab1c4a181fac3e2

commit ef2f36be8fce8cf7a62ce7d33ab1c4a181fac3e2
Author:     Olivier Certner <olce@FreeBSD.org>
AuthorDate: 2025-09-01 09:31:23 +0000
Commit:     Olivier Certner <olce@FreeBSD.org>
CommitDate: 2025-09-15 09:29:44 +0000

    jail.2: Mention EPERM is returned on open directories
    
    The manual page does not directly mention this reason for getting EPERM,
    instead referring the reader to chroot(2).  We have had some questions
    about it recently, in part due to a bug (fixed), and this case is not an
    obvious permission/problem, so let's be more explicit.
    
    PR:             280809
    Reviewed by:    jamie
    MFC after:      3 days
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D52319
---
 lib/libsys/jail.2 | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/libsys/jail.2 b/lib/libsys/jail.2
index d3f871608c1d..ee4e5b03d38e 100644
--- a/lib/libsys/jail.2
+++ b/lib/libsys/jail.2
@@ -23,7 +23,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd September 9, 2025
+.Dd September 15, 2025
 .Dt JAIL 2
 .Os
 .Sh NAME
@@ -555,6 +555,9 @@ and
 call
 .Xr chroot 2
 internally, so they can fail for all the same reasons.
+In particular, they return the
+.Bq Er EPERM
+error when the process to join a jail has open directories.
 Please consult the
 .Xr chroot 2
 manual page for details.