fix shim io copy lost msgs problem occasionally

Signed-off-by: Ngaohuatao <gaohuatao@huawei.com>

src/cmd/isulad-shim/process.c

@@ -243,7 +243,7 @@ static void* task_io_copy(void *data)
     for (;;) {
         memset(buf, 0, DEFAULT_IO_COPY_BUF);
         sem_wait(&(io_thd->sem_thd));
-        if (io_thd->shutdown) {
+        if (io_thd->is_stdin && io_thd->shutdown) {
             break;
         }
 
@@ -272,6 +272,10 @@ static void* task_io_copy(void *data)
                 }
             }
         }
+
+        if (io_thd->shutdown) {
+            break;
+        }
     }
     struct epoll_event ev;
     ev.events = EPOLLIN;
@@ -328,6 +332,7 @@ static int process_io_start(process_t *p, int std_id)
     io_thd->epfd = p->io_loop_fd;
     io_thd->ioc = ioc;
     io_thd->shutdown = false;
+    io_thd->is_stdin = std_id == stdid_in ? true : false;
     io_thd->terminal = std_id != stdid_in ? p->terminal : NULL;
 
     p->io_threads[std_id] = io_thd;

src/cmd/isulad-shim/process.h

@@ -58,6 +58,7 @@ typedef struct {
     sem_t sem_thd;
     io_copy_t *ioc;
     bool shutdown;
+    bool is_stdin;
     log_terminal *terminal;
 } io_thread_t;