diff --git a/ap/libc/glibc/glibc-2.23/stdio-common/bug7.c b/ap/libc/glibc/glibc-2.23/stdio-common/bug7.c
new file mode 100644
index 0000000..2b1efe3
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/stdio-common/bug7.c
@@ -0,0 +1,69 @@
+/* Regression test for fseek and freopen bugs.  */
+
+#include <stdio.h>
+
+int
+main (int argc, char *argv[])
+{
+  int lose = 0;
+  char filename[L_tmpnam];
+  FILE *fp;
+
+  if (tmpnam (filename) == NULL)
+    {
+      printf ("tmpnam failed\n");
+      lose = 1;
+    }
+  else
+    {
+      fp = fopen (filename, "w+");
+      fprintf (fp, "Hello world!\n");
+      fflush (fp);
+      fseek (fp, 5L, SEEK_SET);
+      if (fseek (fp, -1L, SEEK_CUR) < 0)
+	{
+	  printf ("seek failed\n");
+	  lose = 1;
+	}
+      fclose (fp);
+      remove (filename);
+    }
+
+  {
+    FILE *file1;
+    FILE *file2;
+    char filename1[L_tmpnam];
+    char filename2[L_tmpnam];
+    int ch;
+
+    if (tmpnam (filename1) == NULL || tmpnam (filename2) == NULL)
+      {
+	printf ("tmpnam failed\n");
+	lose = 1;
+      }
+    else
+      {
+
+	file1 = fopen (filename1, "w");
+	fclose (file1);
+
+	file2 = fopen (filename2, "w");
+	fputc ('x', file2);
+	fclose (file2);
+
+	file1 = fopen (filename1, "r");
+	file2 = freopen (filename2, "r", file1);
+	if ((ch = fgetc (file2)) != 'x')
+	  {
+	    printf ("wrong character in reopened file, value = %d\n", ch);
+	    lose = 1;
+	  }
+	fclose (file2);
+	remove (filename1);
+	remove (filename2);
+      }
+  }
+
+  puts (lose ? "Test FAILED!" : "Test succeeded.");
+  return lose;
+}