add necessary header and little test.

Author: devnexen

ext/sockets/config.m4

@@ -5,7 +5,7 @@ PHP_ARG_ENABLE([sockets],
 
 if test "$PHP_SOCKETS" != "no"; then
   AC_CHECK_FUNCS([hstrerror if_nametoindex if_indextoname sockatmark])
-  AC_CHECK_HEADERS([sys/sockio.h linux/filter.h linux/if_packet.h linux/if_ether.h])
+  AC_CHECK_HEADERS([sys/sockio.h linux/filter.h linux/if_packet.h linux/if_ether.h linux/udp.h])
   AC_DEFINE([HAVE_SOCKETS], [1],
     [Define to 1 if the PHP extension 'sockets' is available.])
 

ext/sockets/sockets.c

@@ -70,6 +70,9 @@
 # if defined(HAVE_LINUX_IF_ETHER_H)
 #  include <linux/if_ether.h>
 # endif
+# if defined(HAVE_LINUX_UDP_H)
+#  include <linux/udp.h>
+# endif
 #endif
 
 #include <stddef.h>

ext/sockets/tests/socket_cmsg_udp_segment.phpt

@@ -0,0 +1,26 @@
+--TEST--
+UDP_SEGMENT setsockopt(), can't really test is as the kernel support might not be enabled.
+--EXTENSIONS--
+sockets
+--SKIPIF--
+<?php
+if (!defined('UDP_SEGMENT')) { die('skip UDP_SEGMENT is not defined'); }
+?>
+--FILE--
+<?php
+$src = socket_create(AF_UNIX, SOCK_DGRAM, 0);
+
+try {
+	socket_setopt($src, SOL_UDP, UDP_SEGMENT, -1);
+} catch (\ValueError $e) {
+	echo $e->getMessage(), PHP_EOL;
+}
+try {
+	socket_setopt($src, SOL_UDP, UDP_SEGMENT, 65536);
+} catch (\ValueError $e) {
+	echo $e->getMessage(), PHP_EOL;
+}
+?>
+--EXPECT--
+socket_setopt(): Argument #4 ($value) must be of between 0 and 65535
+socket_setopt(): Argument #4 ($value) must be of between 0 and 65535