!779 add interface dlopen_ns_ext

Merge pull request !779 from XUBO/master

porting/linux/user/include/dlfcn_ext.h

@@ -55,6 +55,25 @@ typedef struct {
  */
 void *dlopen_ext(const char *file, int mode, const dl_extinfo *extinfo);
 
+/**
+  * @brief open dso in given namespace which has own lib search paths,
+  *        when namespace is null, it's same to dlopen_ext().
+  *        avoid using "default" as namespace, which is the default namespace.
+  * @param Dl_namespace * Carry the naming information of the namespace.
+  * @param char * the name of the so file you want to open.
+  * @param int open file mode.
+  *    -- RTLD_LAZY.
+  *    -- RTLD_NOW.
+  *    -- RTLD_NOLOAD.
+  *    -- RTLD_NODELETE.
+  *    -- RTLD_GLOBAL.
+  *    -- RTLD_LOCAL.
+  * @param dl_extinfo * indicates the dl_extinfo struct,include flag and relro_fd.
+  * @return success: dynamic library handleoid,failed: NULL.
+  * @retval none.
+  */
+void *dlopen_ns_ext(Dl_namespace *, const char *, int, const dl_extinfo *);
+
 #ifdef __cplusplus
 }
 #endif

porting/linux/user/ldso/dynlink.c

@@ -3299,6 +3299,21 @@ void *dlopen_ns(Dl_namespace *dlns, const char *file, int mode)
 	return dlopen_impl(file, mode, dlns->name, caller_addr, NULL);
 }
 
+void *dlopen_ns_ext(Dl_namespace *dlns, const char *file, int mode, const dl_extinfo *extinfo)
+{
+	const void *caller_addr = __builtin_return_address(0);
+	musl_log_reset();
+	ld_log_reset();
+	LD_LOGI("dlopen_ns_ext file:%{public}s, mode:%{public}x , caller_addr:%{public}p , "
+			"dlns->name:%{public}s. , extinfo->flag:%{public}x",
+		file,
+		mode,
+		caller_addr,
+		dlns->name,
+		extinfo ? extinfo->flag : 0);
+	return dlopen_impl(file, mode, dlns->name, caller_addr, extinfo);
+}
+
 int dlns_create2(Dl_namespace *dlns, const char *lib_path, int flags)
 {
 	if (!dlns) {