From 86849c088365d68d29ebc72813905309487dc8a9 Mon Sep 17 00:00:00 2001
From: Andreas Schneider <asn@cryptomilk.org>
Date: Mon, 14 Jan 2019 11:32:28 +0100
Subject: [PATCH] bind: Check for POLLRDHUP on the server if available
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This is a feature on modern Linux.

Thanks to Ludovic Courtès <ludo@gnu.org> for the pointer.

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
---
 src/CMakeLists.txt | 10 ++++++++--
 src/bind.c         |  9 ++++++++-
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 21e94488..d48ff258 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -300,7 +300,10 @@ if (WITH_SYMBOL_VERSIONING AND HAVE_LD_VERSION_SCRIPT AND ABIMAP_FOUND)
 endif (WITH_SYMBOL_VERSIONING AND HAVE_LD_VERSION_SCRIPT AND ABIMAP_FOUND)
 
 add_library(${LIBSSH_SHARED_LIBRARY} SHARED ${libssh_SRCS})
-target_compile_options(${LIBSSH_SHARED_LIBRARY} PRIVATE ${DEFAULT_C_COMPILE_FLAGS})
+target_compile_options(${LIBSSH_SHARED_LIBRARY}
+                       PRIVATE
+                           ${DEFAULT_C_COMPILE_FLAGS}
+                           -D_GNU_SOURCE)
 
 target_link_libraries(${LIBSSH_SHARED_LIBRARY} ${LIBSSH_LINK_LIBRARIES})
 
@@ -348,7 +351,10 @@ install(
 
 if (BUILD_STATIC_LIB)
   add_library(${LIBSSH_STATIC_LIBRARY} STATIC ${libssh_SRCS})
-  target_compile_options(${LIBSSH_STATIC_LIBRARY} PRIVATE ${DEFAULT_C_COMPILE_FLAGS})
+  target_compile_options(${LIBSSH_STATIC_LIBRARY}
+                         PRIVATE
+                            ${DEFAULT_C_COMPILE_FLAGS}
+                            -D_GNU_SOURCE)
 
   if (MSVC)
     set(OUTPUT_SUFFIX static)
diff --git a/src/bind.c b/src/bind.c
index a91b3ad8..4e28f774 100644
--- a/src/bind.c
+++ b/src/bind.c
@@ -345,11 +345,18 @@ static int ssh_bind_poll_callback(ssh_poll_handle sshpoll,
  */
 ssh_poll_handle ssh_bind_get_poll(ssh_bind sshbind)
 {
+    short events = POLLIN;
+
     if (sshbind->poll) {
         return sshbind->poll;
     }
+
+#ifdef POLLRDHUP
+    events |= POLLRDHUP;
+#endif /* POLLRDHUP */
+
     sshbind->poll = ssh_poll_new(sshbind->bindfd,
-                                 POLLIN,
+                                 events,
                                  ssh_bind_poll_callback,
                                  sshbind);