!584 修复错误码返回值不一致问题

Merge pull request !584 from Rb/zhangbingru

components/lwp/lwp_syscall.c

@@ -4080,11 +4080,21 @@ int sys_sched_getparam(pid_t pid, void *param)
 
 int sys_sched_get_priority_max(int policy)
 {
+    if(policy < 0)
+    {
+        rt_set_errno(EINVAL);
+        return -rt_get_errno();
+    }    
     return RT_THREAD_PRIORITY_MAX;
 }
 
 int sys_sched_get_priority_min(int policy)
 {
+    if(policy < 0)
+    {
+        rt_set_errno(EINVAL);
+        return -rt_get_errno();
+    }
     return 0;
 }
 
@@ -4116,7 +4126,10 @@ int sys_sched_getscheduler(int tid, int *policy, void *param)
 
 int sys_fsync(int fd)
 {
-    return fsync(fd);
+    int res = fsync(fd);
+    if (res < 0)
+        res = rt_get_errno();
+    return res;
 }
 
 const static void* func_table[] =