[glibc] tst-tzset: output reason when creating 4GiB file fails

[Stafford Horne <shorne@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=afbf26492a5adccc4c4eda00eb588b0b79e4290a

commit afbf26492a5adccc4c4eda00eb588b0b79e4290a
Author: Stafford Horne <shorne@gmail.com>
Date:   Mon Sep 20 06:03:07 2021 +0900

    tst-tzset: output reason when creating 4GiB file fails
    
    Currently, if the temporary file creation fails the create_tz_file
    function returns NULL.  The NULL pointer is then passed to setenv which
    causes a SIGSEGV.  Rather than failing with a SIGSEGV print a warning
    and exit.

Diff:
---
 timezone/tst-tzset.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/timezone/tst-tzset.c b/timezone/tst-tzset.c
index d6da2932bb..3dad42e041 100644
--- a/timezone/tst-tzset.c
+++ b/timezone/tst-tzset.c
@@ -25,6 +25,7 @@
 #include <time.h>
 #include <unistd.h>
 #include <support/check.h>
+#include <inttypes.h>
 
 static int do_test (void);
 #define TEST_FUNCTION do_test ()
@@ -103,6 +104,13 @@ static void
 test_tz_file (off64_t size)
 {
   char *path = create_tz_file (size);
+  if (path == NULL)
+   {
+     printf ("creating timezone file of size: %" PRId64 "MiB failed.\n",
+	     size / (1024 * 1024));
+     exit (1);
+   }
+
   if (setenv ("TZ", path, 1) < 0)
     {
       printf ("setenv failed: %m\n");