[PATCH]: unix.7: mentioning SOCK_STREAM socket for ioctl_type of ioctl function

[Jan Chaloupka <jchaloup-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

 From https://bugzilla.redhat.com/show_bug.cgi?id=1110401.

unix.7 is not clear about socket type of ioctl_type argument of ioctl 
function. The description of SIOCINQ is applicable only for SOCK_STREAM 
socket. For SOCK_DGRAM, udp(7) man page gives correct description of 
SIOCINQ.

---
  man7/unix.7 | 11 +++++++++--
  1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/man7/unix.7 b/man7/unix.7
index b0ade5b..6bcc8ba 100644
--- a/man7/unix.7
+++ b/man7/unix.7
@@ -299,7 +299,9 @@ The correct syntax is:
  can be:
  .TP
  .B SIOCINQ
-Returns the amount of queued unread data in the receive buffer.
+For
+.B SOCK_STREAM
+socket the function returns the amount of queued unread data in the 
receive buffer.
  The socket must not be in LISTEN state, otherwise an error
  .RB ( EINVAL )
  is returned.
@@ -319,6 +321,10 @@ defined in
  .\" That number is normally larger than the number of bytes of pending
  .\" output. Since this info is, from userland's point of view, imprecise,
  .\" and it may well change, probably best not to document this now.
+For
+.B SOCK_DGRAM
+socket, see
+.BR udp (7).
  .SH ERRORS
  .TP
  .B EADDRINUSE
@@ -450,4 +456,5 @@ see
  .BR cmsg (3),
  .BR capabilities (7),
  .BR credentials (7),
-.BR socket (7)
+.BR socket (7),
+.BR udp (7)
-- 
1.9.3
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