errno.3: Note probable cause of ENFILE error

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man3/errno.3 b/man3/errno.3
index a32db2f67469b3571bc08a448b8302c8deac78e5..d233123b1ea298ad3c391d1f550b33ea8e125b8a 100644 (file)
--- a/man3/errno.3
+++ b/man3/errno.3
@@ -305,7 +305,11 @@ Connection aborted by network (POSIX.1)
 Network unreachable (POSIX.1)
 .TP
 .B ENFILE
-Too many open files in system (POSIX.1)
+Too many open files in system (POSIX.1);
+on Linux, this is probably a result of encountering the
+.IR /proc/sys/fs/file-max
+limit (see
+.BR proc (5)).
 .\" ENOANO is defined but appears to be unused.
 .TP
 .B ENOBUFS