Provide access to dlopen.

* configure: New test for dlopen.

* lib.c (cptr_equal_op): Function renamed to
cobj_equal_handle_op, to reflect what it's really
doing; it is not specifically to cptr objects.
Also changed from static to extern.
(cptr_ops): Follow rename.

* lib.h (cobj_equal_handle_op): Declared.

* sysif.c (cptr_dl_destroy_op): New static function.
(dlopen_wrap, dlclose_wrap, dlsym_wrap, dlvsym_wrap): New
static functions.
(sysif_init): Register new intrinsic functions dlopen,
dlclose, dlsym, dlvsym. New variables rtld-lazy, rtld-now,
rtld-global, rtld-local, rtld-nodelete, rtld-noload,
rtld-deepbind.

1 files changed, 36 insertions, 0 deletions

diff --git a/configure b/configure
index 0147bd9d..648c8d4c 100755
--- a/configure
+++ b/configure
@@ -2746,6 +2746,42 @@ else
   printf "no\n"
 fi
 
+printf "Checking for dlopen ... "
+
+cat > conftest.c <<!
+#include <dlfcn.h>
+
+int main(void)
+{
+  void *lib = dlopen("foo.so", 0);
+  void *sym = dlsym(lib, "bar");
+#if TEST_DLVSYM
+  void *vsym = dlsvym(lib, "bar", "1");
+#endif
+  dlclose(lib);
+  return 0;
+}
+!
+
+if conftest ; then
+  printf "yes\n"
+  printf "#define HAVE_DLOPEN 1\n" >> config.h
+elif conftest EXTRA_LDFLAGS=-ldl ; then
+  printf "yes\n"
+  printf "#define HAVE_DLOPEN 1\n" >> config.h
+  conf_ldflags="${conf_ldflags:+"$conf_ldflags "}-ldl"
+else
+  printf "no\n"
+fi
+
+printf "Checking for dlsvsym ... "
+if conftest CONF_LDFLAGS="$conf_ldflags" EXTRA_CFLAGS=-DTEST_DLVSYM=1 ; then
+  printf "yes\n"
+  printf "#define HAVE_DLVSYM 1\n" >> config.h
+else
+  printf "no\n"
+fi
+
 printf "Checking for libffi ... "
 
 cat > conftest.c <<!