From: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date: Fri, 5 Aug 2011 05:53:17 +0000 (+0800)
Subject: getsockopt: Add SO_SNDSPACE
X-Git-Tag: v2.12.0~240
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/755c519ce0fab5471f3b9f206fe894f352ab42c5

getsockopt: Add SO_SNDSPACE

This SOL_SOCKET get-only option is used to get the approximate free space
of send buffer.
---

diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
index ff5236a992..204ff48a49 100644
--- a/sys/kern/uipc_socket.c
+++ b/sys/kern/uipc_socket.c
@@ -1549,6 +1549,7 @@ int
 sogetopt(struct socket *so, struct sockopt *sopt)
 {
 	int	error, optval;
+	long	optval_l;
 	struct	linger l;
 	struct	timeval tv;
 #ifdef INET
@@ -1635,6 +1636,11 @@ integer:
 			error = sooptcopyout(sopt, &tv, sizeof tv);
 			break;			
 
+		case SO_SNDSPACE:
+			optval_l = ssb_space(&so->so_snd);
+			error = sooptcopyout(sopt, &optval_l, sizeof(optval_l));
+			break;
+
 		default:
 			error = ENOPROTOOPT;
 			break;
diff --git a/sys/sys/socket.h b/sys/sys/socket.h
index 65a0745bc7..593c4237f6 100644
--- a/sys/sys/socket.h
+++ b/sys/sys/socket.h
@@ -101,6 +101,7 @@ typedef __socklen_t	socklen_t;
 #define	SO_ERROR	0x1007		/* get error status and clear */
 #define	SO_TYPE		0x1008		/* get socket type */
 /*efine	SO_PRIVSTATE	0x1009		   get/deny privileged state */
+#define	SO_SNDSPACE	0x100a		/* get appr. send buffer free space */
 
 /*
  * Structure used for manipulating linger option.