diff --git a/components/libc/compilers/common/unistd.c b/components/libc/compilers/common/unistd.c
index b3efc386e9..0966242e55 100644
--- a/components/libc/compilers/common/unistd.c
+++ b/components/libc/compilers/common/unistd.c
@@ -52,6 +52,7 @@ RTM_EXPORT(usleep);
 
 pid_t getpid(void)
 {
+    /*TODO*/
     return 0;
 }
 RTM_EXPORT(getpid);
@@ -64,24 +65,24 @@ RTM_EXPORT(getppid);
 
 uid_t getuid(void)
 {
-    return 0;
+    return 0; /*ROOT*/
 }
 RTM_EXPORT(getuid);
 
 uid_t geteuid(void)
 {
-    return 0;
+    return 0; /*ROOT*/
 }
 RTM_EXPORT(geteuid);
 
 gid_t getgid(void)
 {
-    return 0;
+    return 0; /*ROOT*/
 }
 RTM_EXPORT(getgid);
 
 gid_t getegid(void)
 {
-    return 0;
+    return 0; /*ROOT*/
 }
 RTM_EXPORT(getegid);