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authorRick Macklem <rmacklem@FreeBSD.org>2021-02-15 02:16:58 +0000
committerRick Macklem <rmacklem@FreeBSD.org>2021-02-15 02:16:58 +0000
commita0698341cd894ba4a640e9a9bb0f72c2133d1228 (patch)
tree71a49cc7d0d8c0714d3af911dcd782b3a8f66611 /lib/libc
parentee10666327b622c2f20a4ac17e7a5673b04e7c9a (diff)
downloadsrc-a0698341cd894ba4a640e9a9bb0f72c2133d1228.tar.gz
src-a0698341cd894ba4a640e9a9bb0f72c2133d1228.zip
getdirentries.2: fix for NFS mounts
It was reported that getdirentries(2) was returning dirents with d_off set to 0 for an NFS mount. This is believed to be correct behaviour at this time (it may change for some NFS mounts in the future), but is inconsistent with what the getdirentries(2) man page says. This patch fixes the man page. This is a content change. PR: 253428 Reviewed by: asomers MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D28664
Diffstat (limited to 'lib/libc')
-rw-r--r--lib/libc/sys/getdirentries.214
1 files changed, 8 insertions, 6 deletions
diff --git a/lib/libc/sys/getdirentries.2 b/lib/libc/sys/getdirentries.2
index f2d1c05240d5..658be9459af5 100644
--- a/lib/libc/sys/getdirentries.2
+++ b/lib/libc/sys/getdirentries.2
@@ -28,7 +28,7 @@
.\" @(#)getdirentries.2 8.2 (Berkeley) 5/3/95
.\" $FreeBSD$
.\"
-.Dd March 30, 2020
+.Dd February 14, 2021
.Dt GETDIRENTRIES 2
.Os
.Sh NAME
@@ -89,7 +89,7 @@ have the same
.Fa d_fileno .
The
.Fa d_off
-field returns a cookie which can be used with
+field returns a cookie which, if non-zero, can be used with
.Xr lseek 2
to position the directory descriptor to the next entry.
The
@@ -148,14 +148,16 @@ only
.Pc ,
a value returned in the
.Fa d_off
-field,
+field if it is non-zero,
or zero.
.Sh IMPLEMENTATION NOTES
The
.Fa d_off
-field is being used as a cookie to readdir for nfs servers.
-These cookies can be cached and allow to read directory entries at a specific
-offset on demand.
+field is currently set to 0 by the NFS client, since the
+directory offset cookies returned by an NFS server cannot
+be used by
+.Xr lseek 2
+at this time.
.Sh RETURN VALUES
If successful, the number of bytes actually transferred is returned.
Otherwise, -1 is returned and the global variable