From ce3c604f48c8217fefdccf649da314bbc5901ee6 Mon Sep 17 00:00:00 2001
From: anjiahao <anjiahao@xiaomi.com>
Date: Fri, 11 Feb 2022 16:15:01 +0800
Subject: [PATCH] libc/chdir:"PWD" should save absolute path

Signed-off-by: anjiahao <anjiahao@xiaomi.com>
---
 libs/libc/unistd/lib_chdir.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/libs/libc/unistd/lib_chdir.c b/libs/libc/unistd/lib_chdir.c
index 20111b61eb..020027e801 100644
--- a/libs/libc/unistd/lib_chdir.c
+++ b/libs/libc/unistd/lib_chdir.c
@@ -100,6 +100,7 @@ int chdir(FAR const char *path)
   struct stat buf;
   char *oldpwd;
   char *alloc;
+  char *abspath;
   int errcode;
   int ret;
 
@@ -151,7 +152,15 @@ int chdir(FAR const char *path)
 
   /* Set the cwd to the input 'path' */
 
-  setenv("PWD", path, TRUE);
+  abspath = realpath(path, NULL);
+  if (abspath == NULL)
+    {
+      errcode = ENOENT;
+      goto errout;
+    }
+
+  setenv("PWD", abspath, TRUE);
+  lib_free(abspath);
   sched_unlock();
   return OK;