[nce] signal hanlder fixes for sigaction

Signed-off-by: lizzie <lizzie@eden-emu.dev>

src/common/signal_chain.cpp

@@ -10,27 +10,16 @@
 
 namespace Common {
 
+#ifdef __ANDROID__
 template <typename T>
 T* LookupLibcSymbol(const char* name) {
-#if defined(__BIONIC__)
     Common::DynamicLibrary provider("libc.so");
-    if (!provider.IsOpen()) {
-        UNREACHABLE_MSG("Failed to open libc!");
-    }
-#else
-    // For other operating environments, we assume the symbol is not overridden.
-    const char* base = nullptr;
-    Common::DynamicLibrary provider(base);
-#endif
-
+    ASSERT_MSG(provider.IsOpen(), "Failed to open libc!");
     void* sym = provider.GetSymbolAddress(name);
     if (sym == nullptr) {
         sym = dlsym(RTLD_DEFAULT, name);
     }
-    if (sym == nullptr) {
-        UNREACHABLE_MSG("Unable to find symbol {}!", name);
-    }
-
+    ASSERT_MSG(sym != nullptr, "Unable to find symbol {}!", name);
     return reinterpret_cast<T*>(sym);
 }
 
@@ -38,5 +27,10 @@ int SigAction(int signum, const struct sigaction* act, struct sigaction* oldact)
     static auto libc_sigaction = LookupLibcSymbol<decltype(sigaction)>("sigaction");
     return libc_sigaction(signum, act, oldact);
 }
+#else
+int SigAction(int signum, const struct sigaction* act, struct sigaction* oldact) {
+    return sigaction(signum, act, oldact);
+}
+#endif
 
 } // namespace Common