nghttpx: Store errno to a variable temporarly

src/shrpx.cc

@@ -287,11 +287,13 @@ void drop_privileges()
 {
   if(getuid() == 0 && get_config()->uid != 0) {
     if(setgid(get_config()->gid) != 0) {
-      LOG(FATAL) << "Could not change gid: " << strerror(errno);
+      auto error = errno;
+      LOG(FATAL) << "Could not change gid: " << strerror(error);
       exit(EXIT_FAILURE);
     }
     if(setuid(get_config()->uid) != 0) {
-      LOG(FATAL) << "Could not change uid: " << strerror(errno);
+      auto error = errno;
+      LOG(FATAL) << "Could not change uid: " << strerror(error);
       exit(EXIT_FAILURE);
     }
     if(setuid(0) != -1) {
@@ -527,7 +529,8 @@ int event_loop()
   auto listener_handler = new ListenHandler(evbase, sv_ssl_ctx, cl_ssl_ctx);
   if(get_config()->daemon) {
     if(daemon(0, 0) == -1) {
-      LOG(FATAL) << "Failed to daemonize: " << strerror(errno);
+      auto error = errno;
+      LOG(FATAL) << "Failed to daemonize: " << strerror(error);
       exit(EXIT_FAILURE);
     }
   }

src/shrpx_http2_session.cc

@@ -196,7 +196,8 @@ int Http2Session::init_notification()
   rv = socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0,
                   sockpair);
   if(rv == -1) {
-    SSLOG(FATAL, this) << "socketpair() failed: errno=" << errno;
+    auto error = errno;
+    SSLOG(FATAL, this) << "socketpair() failed: errno=" << error;
     return -1;
   }
 
@@ -277,8 +278,9 @@ void eventcb(bufferevent *bev, short events, void *ptr)
     int val = 1;
     if(setsockopt(fd, IPPROTO_TCP, TCP_NODELAY,
                   reinterpret_cast<char*>(&val), sizeof(val)) == -1) {
+      auto error = errno;
       SSLOG(WARNING, http2session)
-        << "Setting option TCP_NODELAY failed: errno=" << errno;
+        << "Setting option TCP_NODELAY failed: errno=" << error;
     }
     return;
   }

src/shrpx_listen_handler.cc

@@ -106,7 +106,8 @@ void ListenHandler::create_worker_thread(size_t num)
     rv = socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0,
                     info->sv);
     if(rv == -1) {
-      LLOG(ERROR, this) << "socketpair() failed: errno=" << errno;
+      auto error = errno;
+      LLOG(ERROR, this) << "socketpair() failed: errno=" << error;
       continue;
     }