tests:libdl: add a new test for symbol scope issue in dlclose

Test case to trigger an issue raised by the new symbol scope design,
that was erroneously removing local symbol scope from the global one
too early while dl-closing a shared library.
Based on original test-case by Khem Raj

Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Reported-by: Khem Raj <raj.khem@gmail.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/test/dlopen/testscope.c b/test/dlopen/testscope.c
new file mode 100644
index 000000000..90e079885
--- /dev/null
+++ b/test/dlopen/testscope.c
@@ -0,0 +1,29 @@
+#include <dlfcn.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define LIBNAME "libA.so"
+int main(int argc, char **argv)
+{
+	void *libA;
+	void (*libAfn)(void);
+	char *error;
+
+	libA = dlopen(LIBNAME, RTLD_LAZY);
+	if (!libA) {
+		fprintf(stderr, "Could not open ./%s: %s\n", LIBNAME, dlerror());
+		exit(1);
+	}
+
+	libAfn = dlsym(libA, "libA_func");
+	if ((error = dlerror()) != NULL)  {
+		fprintf(stderr, "Could not locate symbol 'libA_func': %s\n", error);
+		exit(1);
+	}
+
+	libAfn();
+
+	dlclose(libA);
+
+	return EXIT_SUCCESS;
+}