From: Michalis Pappas <michalis@unikraft.io>
Date: Tue, 20 Feb 2024 04:02:02 +0000 (+0100)
Subject: Provide config option for SO_LINGER and enable by default
X-Git-Tag: RELEASE-0.17.0~2
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=1176c04afe3ec91983c6812cdf95ea3b2dd5b8c1;p=unikraft%2Flibs%2Flwip.git

Provide config option for SO_LINGER and enable by default

Add a Kconfig option that controls support for SO_LINGER, and enable
by default. SO_LINGER allows delaying close() by a specified timeout
when data is still available in the socket.

Signed-off-by: Michalis Pappas <michalis@unikraft.io>
Reviewed-by: Andrei Tatar <andrei@unikraft.io>
Reviewed-by: Sergiu Moga <sergiu@unikraft.io>
Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #52
---

diff --git a/Config.uk b/Config.uk
index b541695..1218a7b 100644
--- a/Config.uk
+++ b/Config.uk
@@ -192,6 +192,13 @@ config LWIP_RCVBUF
 	help
 		Use receive buffers, enabling the SO_RCVBUF socket option and FIONREAD ioctl
 
+config LWIP_LINGER
+	bool "Linger on close()"
+	default y
+	help
+		Enables support of the SO_LINGER socket option that allows delaying close()
+		if data still available in the socket.
+
 config LWIP_LOOPBACK
 	bool "Loopback traffic"
 	default y
diff --git a/include/lwipopts.h b/include/lwipopts.h
index 66c26f3..710c160 100644
--- a/include/lwipopts.h
+++ b/include/lwipopts.h
@@ -219,6 +219,10 @@ void sys_free(void *ptr);
 #define LWIP_SO_RCVBUF 1
 #endif
 
+#if CONFIG_LWIP_LINGER
+#define LWIP_SO_LINGER 1
+#endif
+
 #if LWIP_SOCKET
 #if CONFIG_HAVE_LIBC
 /* Stop lwip to provide ioctl constants */