Apply FD_CLOEXEC on listening socket

Use fcntl on listening socket to ensure it gets closed in case any
server ever execs. There is no need for a child to listen and keep
the port occupied.

diff --git a/configure.ac b/configure.ac
index 30e9464..bce01e5 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -17,7 +17,7 @@ if test -z "$YAZLIB"; then
        AC_MSG_ERROR([YAZ development libraries missing])
 fi
 YAZ_DOC
-AC_CHECK_HEADERS([unistd.h sys/stat.h sys/time.h sys/types.h])
+AC_CHECK_HEADERS([unistd.h sys/stat.h sys/time.h sys/types.h fcntl.h])
 
 AC_ARG_ENABLE(zoom,[  --disable-zoom          disable ZOOM (for old C++ compilers)],[enable_zoom=$enableval],[enable_zoom=yes])
 AM_CONDITIONAL(ZOOM, test $enable_zoom = "yes")

diff --git a/src/yaz-pdu-assoc.cpp b/src/yaz-pdu-assoc.cpp
index 8211bc1..8f0d383 100644 (file)
--- a/src/yaz-pdu-assoc.cpp
+++ b/src/yaz-pdu-assoc.cpp
@@ -10,6 +10,10 @@
 
 #include <yazpp/pdu-assoc.h>
 
+#if HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
 using namespace yazpp_1;
 
 void PDU_Assoc::init(ISocketObservable *socketObservable)
@@ -425,11 +429,21 @@ int PDU_Assoc::listen(IPDU_Observer *observer, const char *addr)
         return -1;
     if (cs_bind(m_cs, ap, CS_SERVER) < 0)
         return -2;
-    m_socketObservable->addObserver(cs_fileno(m_cs), this);
+
+    int fd = cs_fileno(m_cs);
+#if HAVE_FCNTL_H
+    int oldflags = fcntl(fd, F_GETFD, 0);
+    if (oldflags >= 0)
+    {
+        oldflags |= FD_CLOEXEC;
+        fcntl(fd, F_SETFD, oldflags);
+    }
+#endif
+    m_socketObservable->addObserver(fd, this);
     yaz_log(m_log, "maskObserver 9");
     m_socketObservable->maskObserver(this, SOCKET_OBSERVE_READ|
                                      SOCKET_OBSERVE_EXCEPT);
-    yaz_log (m_log, "PDU_Assoc::listen ok fd=%d", cs_fileno(m_cs));
+    yaz_log (m_log, "PDU_Assoc::listen ok fd=%d", fd);
     m_state = Listen;
     return 0;
 }