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-rw-r--r--elf/reldep.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/elf/reldep.c b/elf/reldep.c
new file mode 100644
index 0000000000..44b239b6c7
--- /dev/null
+++ b/elf/reldep.c
@@ -0,0 +1,111 @@
+#include <dlfcn.h>
+#include <mcheck.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+main (void)
+{
+ void *h1;
+ void *h2;
+ int (*fp) (void);
+ int *vp;
+
+ mtrace ();
+
+ /* Open the two objects. */
+ h1 = dlopen ("reldepmod1.so", RTLD_LAZY | RTLD_GLOBAL);
+ if (h1 == NULL)
+ {
+ printf ("cannot open reldepmod1.so: %s\n", dlerror ());
+ exit (1);
+ }
+ h2 = dlopen ("reldepmod2.so", RTLD_LAZY);
+ if (h2 == NULL)
+ {
+ printf ("cannot open reldepmod2.so: %s\n", dlerror ());
+ exit (1);
+ }
+
+ /* Get the address of the variable in reldepmod1.so. */
+ vp = dlsym (h1, "some_var");
+ if (vp == NULL)
+ {
+ printf ("cannot get address of \"some_var\": %s\n", dlerror ());
+ exit (1);
+ }
+
+ *vp = 42;
+
+ /* Get the function `call_me' in the second object. This has a
+ dependency which is resolved by a definition in reldepmod1.so. */
+ fp = dlsym (h2, "call_me");
+ if (fp == NULL)
+ {
+ printf ("cannot get address of \"call_me\": %s\n", dlerror ());
+ exit (1);
+ }
+
+ /* Call the function. */
+ if (fp () != 0)
+ {
+ puts ("function \"call_me\" returned wrong result");
+ exit (1);
+ }
+
+ /* Now close the first object. If must still be around since we have
+ a implicit dependency. */
+ if (dlclose (h1) != 0)
+ {
+ printf ("closing h1 failed: %s\n", dlerror ());
+ exit (1);
+ }
+
+ /* Try calling the function again. This will fail if the first object
+ got unloaded. */
+ if (fp () != 0)
+ {
+ puts ("second call of function \"call_me\" returned wrong result");
+ exit (1);
+ }
+
+ /* Now close the second file as well. */
+ if (dlclose (h2) != 0)
+ {
+ printf ("closing h2 failed: %s\n", dlerror ());
+ exit (1);
+ }
+
+ /* Finally, open the first object again. */
+ h1 = dlopen ("reldepmod1.so", RTLD_LAZY | RTLD_GLOBAL);
+ if (h1 == NULL)
+ {
+ printf ("cannot open reldepmod1.so the second time: %s\n", dlerror ());
+ exit (1);
+ }
+
+ /* And get the variable address again. */
+ vp = dlsym (h1, "some_var");
+ if (vp == NULL)
+ {
+ printf ("cannot get address of \"some_var\" the second time: %s\n",
+ dlerror ());
+ exit (1);
+ }
+
+ /* The variable now must have its originial value. */
+ if (*vp != 0)
+ {
+ puts ("variable \"some_var\" not reset");
+ exit (1);
+ }
+
+ /* Close the first object again, we are done. */
+ if (dlclose (h1) != 0)
+ {
+ printf ("closing h1 failed: %s\n", dlerror ());
+ exit (1);
+ }
+
+ return 0;
+}