[glibc] io/tst-stat.c: Use a temporary directory for symlink test

[H.J. Lu]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=55e85c1e48c2aae71c0b5907fd22a3e9b978b6e8

commit 55e85c1e48c2aae71c0b5907fd22a3e9b978b6e8
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Jul 18 17:03:04 2025 -0700

    io/tst-stat.c: Use a temporary directory for symlink test
    
    Call support_create_temp_directory to create a temporary directory for
    symlink test, instead of a fixed file in the glibc source tree, to avoid
    the race condition when there are more than one glibc tests running at the
    same time with the same glibc source tree.  This fixes BZ #33178.
    
    Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
    Reviewed-by: Andreas K. Huettel <dilfridge@gentoo.org>

Diff:
---
 io/tst-stat.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/io/tst-stat.c b/io/tst-stat.c
index aeea435ca1..5e0bfcc30e 100644
--- a/io/tst-stat.c
+++ b/io/tst-stat.c
@@ -27,6 +27,7 @@
 #include <sys/sysmacros.h>
 #include <stdio.h>
 #include <unistd.h>
+#include <stdlib.h>
 
 static void
 stat_check (int fd, const char *path, struct stat *st)
@@ -78,7 +79,8 @@ static int
 do_test (void)
 {
   char *path;
-  const char *linkame = "tst-fstat.linkname";
+  char *tempdir = support_create_temp_directory ("tst-stat-");
+  char *linkname = xasprintf ("%s/tst-fstat.linkname", tempdir);
   int fd = create_temp_file ("tst-fstat.", &path);
   TEST_VERIFY_EXIT (fd >= 0);
   support_write_file_string (path, "abc");
@@ -122,9 +124,12 @@ do_test (void)
 	}
     }
 
-  TEST_COMPARE (symlink ("tst-fstat.target", linkame), 0);
-  add_temp_file (linkame);
-  fstatat_link (linkame, &st);
+  TEST_COMPARE (symlink ("tst-fstat.target", linkname), 0);
+  add_temp_file (linkname);
+  fstatat_link (linkname, &st);
+
+  free (linkname);
+  free (tempdir);
 
   return 0;
 }