[PATCH 1/2] Document lseek SEEK_DATA/SEEK_HOLE

[Paul Eggert]

* doc/posix-functions/lseek.texi (lseek):
Document some systems that do not support SEEK_DATA and SEEK_HOLE.
---
 ChangeLog                      | 6 ++++++
 doc/posix-functions/lseek.texi | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index cdc2b3d7a..cf0bbb396 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2019-06-23  Paul Eggert  <address@hidden>
+
+       Document lseek SEEK_DATA/SEEK_HOLE
+       * doc/posix-functions/lseek.texi (lseek):
+       Document some systems that do not support SEEK_DATA and SEEK_HOLE.
+
 2019-06-22  Akim Demaille  <address@hidden>
 
        argmatch: put all the docs member last.
diff --git a/doc/posix-functions/lseek.texi b/doc/posix-functions/lseek.texi
index 813bdd9b6..b4d03f528 100644
--- a/doc/posix-functions/lseek.texi
+++ b/doc/posix-functions/lseek.texi
@@ -31,4 +31,7 @@ When the @code{lseek} function fails, POSIX says that the 
file offset remains
 unchanged.  But on some platforms, attempting to set a negative file offset
 fails and sets the file offset to 0:
 BeOS.
+@item
+Some systems do not support @code{SEEK_DATA} and @code{SEEK_HOLE}:
+AIX, HP-UX, Microsoft Windows, NetBSD, OpenBSD.
 @end itemize
-- 
2.21.0