MFC r320807:

stdbuf(1): Add buffer definition "B" to the usage message

This option has been missing from the usage message ever since the program
was first imported.

Submitted by:	shivansh
Reviewed by:	asomers
Sponsored by:	Google, Inc (GSoC 2017)
Differential Revision:	https://reviews.freebsd.org/D11529

2 files changed, 19 insertions, 3 deletions

diff --git a/share/man/man4/aio.4 b/share/man/man4/aio.4
index 048561d..0ea7284 100644
--- a/share/man/man4/aio.4
+++ b/share/man/man4/aio.4
@@ -27,7 +27,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd July 21, 2016
+.Dd June 22, 2017
 .Dt AIO 4
 .Os
 .Sh NAME
@@ -161,11 +161,27 @@ field which can be used to request notification when an operation completes.
 For
 .Dv SIGEV_KEVENT
 notifications,
-the posted kevent will contain:
+the
+.Va sigevent
+.Ap
+s
+.Va sigev_notify_kqueue
+field should contain the descriptor of the kqueue that the event should be attached
+to, its
+.Va sigev_notify_kevent_flags
+field may contain
+.Dv EV_ONESHOT ,
+.Dv EV_CLEAR , and/or
+.Dv EV_DISPATCH , and its
+.Va sigev_notify
+field should be set to
+.Dv SIGEV_KEVENT .
+The posted kevent will contain:
 .Bl -column ".Va filter"
 .It Sy Member Ta Sy Value
 .It Va ident Ta asynchronous I/O control buffer pointer
 .It Va filter Ta Dv EVFILT_AIO
+.It Va flags Ta Dv EV_EOF
 .It Va udata Ta
 value stored in
 .Va aio_sigevent.sigev_value
diff --git a/usr.bin/stdbuf/stdbuf.c b/usr.bin/stdbuf/stdbuf.c
index 4346cc8..c05a44d 100644
--- a/usr.bin/stdbuf/stdbuf.c
+++ b/usr.bin/stdbuf/stdbuf.c
@@ -40,7 +40,7 @@ static void
 usage(int s)
 {
 
-	fprintf(stderr, "Usage: %s [-e 0|L|<sz>] [-i 0|L|<sz>] [-o 0|L|<sz>] "
+	fprintf(stderr, "Usage: %s [-e 0|L|B|<sz>] [-i 0|L|B|<sz>] [-o 0|L|B|<sz>] "
 	    "<cmd> [args ...]\n", __progname);
 	exit(s);
 }