tests: Run IPC with use-filesystem-sockets active

Provide an LD_PRELOAD library that simulates the presence
of /etc/libqb/use-filesystem-sockets so that we can test
that functionality without actually having the file on
the system and affecting everything else running on the
box.

Author: chrissie-c

tests/Makefile.am

@@ -113,11 +113,16 @@ endif
 bench_log_SOURCES = bench-log.c
 bench_log_LDADD = $(top_builddir)/lib/libqb.la
 
+lib_LTLIBRARIES = libstat_wrapper.la
+libstat_wrapper_la_SOURCES = libstat_wrapper.c
+libstat_wrapper_la_LIBADD = -ldl
+libdir= $(TESTDIR)
+
 if HAVE_CHECK
-EXTRA_DIST += start.test resources.test
+EXTRA_DIST += start.test resources.test ipc_sock.test
 EXTRA_DIST += blackbox-segfault.sh
 
-TESTS = start.test array.test map.test rb.test list.test log.test blackbox-segfault.sh loop.test ipc.test resources.test
+TESTS = start.test array.test map.test rb.test list.test log.test blackbox-segfault.sh loop.test ipc.test ipc_sock.test resources.test
 TESTS_ENVIRONMENT = export PATH=.:../tools:$$PATH;
 
 resources.log: rb.log log.log ipc.log
@@ -126,7 +131,7 @@ check_LTLIBRARIES =
 check_PROGRAMS = array.test ipc.test list.test log.test loop.test \
 		 map.test rb.test util.test \
 		 crash_test_dummy file_change_bytes
-dist_check_SCRIPTS = start.test resources.test blackbox-segfault.sh
+dist_check_SCRIPTS = start.test resources.test blackbox-segfault.sh ipc_sock.test
 
 if HAVE_SLOW_TESTS
 TESTS += util.test

tests/ipc_sock.test

@@ -0,0 +1,19 @@
+#!/bin/sh
+#
+# Run the IPC tests under the stat wrapper,
+# this simulates /etc/libqb/use-filesystem-sockets existing
+# so we can test both options without breaking other things
+# that might be running on this system
+#
+if [ "`uname -s`" = "Linux" ]
+then
+  if [ -f `pwd`/.libs/libstatwrapper.so ]
+  then
+    export LD_PRELOAD=`pwd`/.libs/libstat_wrapper.so
+  else
+    export LD_PRELOAD=`pwd`/libstat_wrapper.so
+  fi
+  ./ipc.test
+else
+  exit 0
+fi

tests/libstat_wrapper.c

@@ -0,0 +1,35 @@
+/*
+ * Simulate FORCESOCKETSFILE existing for the IPC tests
+ */
+
+#include <stdio.h>
+#include <dlfcn.h>
+#include <string.h>
+#include <sys/stat.h>
+#include "../include/config.h"
+#if defined(QB_LINUX) || defined(QB_CYGWIN)
+#include <gnu/lib-names.h>
+#endif
+
+int __xstat(int __ver, const char *__filename, struct stat *__stat_buf)
+{
+#if defined(QB_LINUX) || defined(QB_CYGWIN)
+	static int opened = 0;
+	static void *dlhandle;
+	static int (*real_xstat)(int __ver, const char *__filename, void *__stat_buf);
+
+	if (!opened) {
+		dlhandle = dlopen(LIBC_SO, RTLD_NOW);
+		real_xstat = dlsym(dlhandle, "__xstat");
+		opened = 1;
+	}
+
+	if (strcmp(__filename, FORCESOCKETSFILE) == 0) {
+		return 0; /* it exists! */
+	}
+
+	return real_xstat(__ver, __filename, __stat_buf);
+#else
+	return -1; /* Error in the unlikely event we get called on *BSD* */
+#endif
+}