Ignore Connection Aborted errors on accept (#29318)

* Ignore Connection Aborted errors on accept

* Reviewer comments

src/core/lib/iomgr/tcp_server_posix.cc

@@ -204,13 +204,13 @@ static void on_read(void* arg, grpc_error_handle err) {
        strip off the ::ffff:0.0.0.0/96 prefix first. */
     int fd = grpc_accept4(sp->fd, &addr, 1, 1);
     if (fd < 0) {
-      switch (errno) {
+      if (errno == EINTR) {
-        case EINTR:
         continue;
-        case EAGAIN:
+      } else if (errno == EAGAIN || errno == ECONNABORTED ||
+                 errno == EWOULDBLOCK) {
         grpc_fd_notify_on_read(sp->emfd, &sp->read_closure);
         return;
-        default:
+      } else {
         gpr_mu_lock(&sp->server->mu);
         if (!sp->server->shutdown_listeners) {
           gpr_log(GPR_ERROR, "Failed accept4: %s", strerror(errno));