Add a test which shows off the broken spots in our dlopen implementation

test/dlopen/Makefile

@@ -0,0 +1,49 @@
+# Makefile for uClibc
+#
+# Copyright (C) 2000,2001 Erik Andersen <andersen@uclibc.org>
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU Library General Public License as published by the Free
+# Software Foundation; either version 2 of the License, or (at your option) any
+# later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Library General Public License
+# along with this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+TESTDIR=../
+include $(TESTDIR)/Rules.mak
+
+all: run
+
+test1: test1.c
+	$(CC) $(CFLAGS) -o test1 test1.c -ldl
+
+test2: test2.c
+	$(CC) $(CFLAGS) -o test2 test2.c -ldl
+
+libtest1.o: libtest1.c
+	$(CC) $(CFLAGS) -fPIC -c libtest1.c -o libtest1.o
+
+libtest2.o: libtest2.c
+	$(CC) $(CFLAGS) -fPIC -c libtest2.c -o libtest2.o
+
+libtest1.so: libtest1.o
+	$(CC) $(CFLAGS) -fPIC -shared -o libtest1.so -Wl,-soname,libtest1.so libtest1.o ./libtest2.so
+
+libtest2.so: libtest2.o
+	$(CC) $(CFLAGS) -fPIC -shared -o libtest2.so -Wl,-soname,libtest2.so libtest2.o
+
+run: libtest2.so libtest1.so test1 test2
+	@echo "----------running test 1--------------"
+	-LD_LIBRARY_PATH=`pwd`:. ./test1
+	@echo "----------running test 2--------------"
+	-LD_LIBRARY_PATH=`pwd`:. ./test2
+
+clean:
+	rm -f *.o libtest1.so* libtest2.so* test1 test2

test/dlopen/libtest1.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+
+extern int libtest2_func(const char *s);
+
+
+void __attribute__((constructor)) libtest1_ctor(void)
+{
+    printf("I am the libtest1 constructor!\n");
+}
+
+void __attribute__((destructor)) libtest1_dtor(void)
+{
+    printf("I am the libtest1 destructor!\n");
+}
+
+void __attribute__((weak)) function1(void)
+{
+    printf("libtest1: I am function1 from libtest1!\n");
+}
+
+void function2(void)
+{
+    printf("libtest1: I am overriding function2!\n");
+}
+
+
+int dltest(const char *s)
+{
+    printf( "libtest1: function1 = %p\n"
+	    "libtest1: function2 = %p\n",
+	    function1, function2);
+    function1();
+    function2();
+    return(libtest2_func(s));
+}
+
+

test/dlopen/libtest2.c

@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <pthread.h>
+
+
+extern int __pthread_mutex_init (void);
+
+void __attribute__((constructor)) libtest2_ctor(void)
+{
+    printf("I am the libtest2 constructor!\n");
+}
+
+void __attribute__((destructor)) libtest2_dtor(void)
+{
+    printf("I am the libtest2 destructor!\n");
+}
+
+void function1(void)
+{
+    printf("libtest2: I am overriding function1!\n");
+}
+
+void __attribute__((weak)) function2(void)
+{
+    printf("libtest2: I am function2 from libtest2!\n");
+}
+
+
+int libtest2_func(const char *s)
+{
+    function1();
+    function2();
+    printf( "libtest2: function1 = %p\n"
+	    "libtest2: function2 = %p\n"
+	    "libtest2: message from main() = '%s'\n",
+	    function1, function2, s);
+    return 0;
+}
+
+

test/dlopen/test1.c

@@ -0,0 +1,33 @@
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <dlfcn.h>
+
+#ifdef __UCLIBC__
+extern void _dlinfo(void);
+#endif
+
+int main(int argc, char **argv) {
+	void *handle;
+	int (*mydltest)(const char *s);
+	char *error;
+
+	handle = dlopen ("./libtest1.so", RTLD_LAZY);
+	if (!handle) {
+		fprintf(stderr, "Could not open ./libtest1.so: %s\n", dlerror());
+		exit(1);
+	}
+
+	mydltest = dlsym(handle, "dltest");
+	if ((error = dlerror()) != NULL)  {
+		fprintf(stderr, "Could not locate symbol 'dltest': %s\n", error);
+		exit(1);
+	}
+
+	mydltest("hello world!");
+
+	dlclose(handle);
+
+	return EXIT_SUCCESS;
+}
+

test/dlopen/test2.c

@@ -0,0 +1,39 @@
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <dlfcn.h>
+
+#ifdef __UCLIBC__
+extern void _dlinfo(void);
+#endif
+
+int main(int argc, char **argv) {
+	void *handle;
+	int (*mydltest)(const char *s);
+	char *error;
+
+	handle = dlopen ("./libtest2.so", RTLD_LAZY);
+	if (!handle) {
+		fprintf(stderr, "Could not open ./libtest2.so: %s\n", dlerror());
+		exit(1);
+	}
+
+	handle = dlopen ("./libtest1.so", RTLD_LAZY);
+	if (!handle) {
+		fprintf(stderr, "Could not open ./libtest1.so: %s\n", dlerror());
+		exit(1);
+	}
+
+	mydltest = dlsym(handle, "dltest");
+	if ((error = dlerror()) != NULL)  {
+		fprintf(stderr, "Could not locate symbol 'dltest': %s\n", error);
+		exit(1);
+	}
+
+	mydltest("hello world!");
+
+	dlclose(handle);
+
+	return EXIT_SUCCESS;
+}
+