ldso: Consistently set & use DL_OPENED flag in both ld.so and libdl

Previously, DL_OPENED flag was set in libdl only and never used.
Set it centralized in _dl_load_elf_shared_library() & use it in
both ld.so and libdl.
Additionally, rename it to DL_OPENED2 for clarity.

Signed-off-by: Leonid Lisovskiy <lly.dev@gmail.com>

ldso/include/dl-hash.h

@@ -153,7 +153,7 @@ struct elf_resolve {
 #define JMP_RELOCS_DONE	    0x000002
 #define INIT_FUNCS_CALLED   0x000004
 #define FINI_FUNCS_CALLED   0x000008
-#define DL_OPENED	    0x000010
+#define DL_OPENED2	    0x000010
 #define DL_RESERVED	    0x000020
 
 extern struct dyn_elf     * _dl_symbol_tables;

ldso/ldso/dl-elf.c

@@ -546,6 +546,7 @@ struct elf_resolve *_dl_load_elf_shared_library(unsigned int rflags,
 		if (tpnt->st_dev == st.st_dev && tpnt->st_ino == st.st_ino) {
 			/* Already loaded */
 			tpnt->usage_count++;
+			tpnt->init_flag |= DL_OPENED2;
 			_dl_close(infile);
 			return tpnt;
 		}

ldso/ldso/ldso.c

@@ -905,7 +905,7 @@ of this helper program; chances are you did not intend to run this program.\n\
 
 #ifdef __LDSO_LDD_SUPPORT__
 					if (trace_loaded_objects && !_dl_trace_prelink &&
-					    tpnt1->usage_count == 1) {
+					    !(tpnt1->init_flag & DL_OPENED2)) {
 						/* This is a real hack to make
 						 * ldd not print the library
 						 * itself when run on a
@@ -997,7 +997,7 @@ of this helper program; chances are you did not intend to run this program.\n\
 
 # ifdef __LDSO_LDD_SUPPORT__
 				if (trace_loaded_objects && !_dl_trace_prelink &&
-				    tpnt1->usage_count == 1) {
+				    !(tpnt1->init_flag & DL_OPENED2)) {
 					_dl_dprintf(1, "\t%s => %s (%x)\n",
 						    cp2, tpnt1->libname,
 						    DL_LOADADDR_BASE(tpnt1->loadaddr));
@@ -1034,6 +1034,8 @@ of this helper program; chances are you did not intend to run this program.\n\
 							/* Insert the ld.so only once */
 							ldso_tpnt = add_ldso(tpnt, load_addr,
 												 ldso_mapaddr, auxvt, rpnt);
+						} else {
+							ldso_tpnt->init_flag |= DL_OPENED2;
 						}
 						ldso_tpnt->usage_count++;
 						tpnt1 = ldso_tpnt;
@@ -1064,7 +1066,7 @@ of this helper program; chances are you did not intend to run this program.\n\
 
 #ifdef __LDSO_LDD_SUPPORT__
 				if (trace_loaded_objects && !_dl_trace_prelink &&
-				    tpnt1->usage_count == 1) {
+				    !(tpnt1->init_flag & DL_OPENED2)) {
 					_dl_dprintf(1, "\t%s => %s (%x)\n",
 						    lpntstr, tpnt1->libname,
 						    DL_LOADADDR_BASE(tpnt1->loadaddr));

ldso/libdl/libdl.c

@@ -396,7 +396,7 @@ static void *do_dlopen(const char *libname, int flag, ElfW(Addr) from)
 	dyn_chain->next_handle = _dl_handles;
 	_dl_handles = dyn_ptr = dyn_chain;
 
-	if (tpnt->usage_count > 1) {
+	if (tpnt->init_flag & DL_OPENED2) {
 		_dl_if_debug_print("Lib: %s already opened\n", libname);
 		/* see if there is a handle from a earlier dlopen */
 		for (handle = _dl_handles->next_handle; handle; handle = handle->next_handle) {
@@ -412,8 +412,6 @@ static void *do_dlopen(const char *libname, int flag, ElfW(Addr) from)
 		return dyn_chain;
 	}
 
-	tpnt->init_flag |= DL_OPENED;
-
 	_dl_if_debug_print("Looking for needed libraries\n");
 	nlist = 0;
 	runp = alloca(sizeof(*runp));