posix shm open 失败时如果文件不存在打印log #2 修改逻辑错误

Author: Aengus.Jiang

src/libipc/platform/posix/shm_posix.cpp

@@ -72,7 +72,8 @@ id_t acquire(char const * name, std::size_t size, unsigned mode) {
                                                S_IRGRP | S_IWGRP | 
                                                S_IROTH | S_IWOTH);
     if (fd == -1) {
-        if (open != mode) {
+        // only open shm not log error when file not exist
+        if (open != mode || ENOENT != errno) {
             ipc::error("fail shm_open[%d]: %s\n", errno, op_name.c_str());
         }
         return nullptr;