import RT-Thread@9217865c without bsp, libcpu and components/net

examples/utest/testcases/posix/unistd_h/functions/chdir_tc.c

@@ -0,0 +1,66 @@
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+#define NEW_CURR_DIR "./chdir_test"
+
+static int chdir_entry(void)
+{
+    __attribute__((unused)) long path_max;
+    size_t size;
+    char *buf;
+    char *ptr;
+
+    __attribute__((unused)) char *old_dir;
+
+    size = 1024;
+
+    for (buf = ptr = NULL; ptr == NULL; size *= 2)
+    {
+        if ((buf = realloc(buf, size)) == NULL)
+        {
+            printf("error\n");
+        }
+        ptr = getcwd(buf, size);
+        
+        if (ptr == NULL)
+        {
+            printf("error\n");
+        }
+        else
+        {
+            printf("ptr %s\n",ptr);
+            printf("old curr dir is %s\n", ptr);
+        }
+
+        mkdir(NEW_CURR_DIR, 0x777);
+        chdir(NEW_CURR_DIR);
+
+        ptr = getcwd(buf, size);
+        if (ptr == NULL)
+        {
+            printf("error\n");
+        }
+        else
+        {
+            printf("new curr dir is %s\n", ptr);
+        }
+        
+    }
+    free(buf);
+    return 0;
+}
+
+#include <utest.h>
+static void test_chdir(void)
+{
+    uassert_int_equal(chdir_entry(), 0);
+}
+static void testcase(void)
+{
+    UTEST_UNIT_RUN(test_chdir);
+}
+UTEST_TC_EXPORT(testcase, "posix.unistd_h.chdir_tc.c", RT_NULL, RT_NULL, 10);
+