This patch is a RHEL-only patch which modifies the custom changes
in the previous patches in this series to make the test case look
more like the upstream test case.

diff -rup a/stdlib/tst-system.c b/stdlib/tst-system.c
--- a/stdlib/tst-system.c	2023-07-10 13:37:53.089505036 -0400
+++ b/stdlib/tst-system.c	2023-07-10 14:04:03.922610279 -0400
@@ -173,10 +173,10 @@ do_test (void)
   {
     pthread_t long_sleep_thread = xpthread_create (NULL,
                                                    sleep_and_check_sigchld,
-                                                   &(double) { 2 });
+                                                   &(double) { 0.2 });
     pthread_t short_sleep_thread = xpthread_create (NULL,
                                                     sleep_and_check_sigchld,
-                                                    &(double) { 1 });
+                                                    &(double) { 0.1 });
     xpthread_join (short_sleep_thread);
     xpthread_join (long_sleep_thread);
   }
diff -rup a/support/shell-container.c b/support/shell-container.c
--- a/support/shell-container.c	2023-07-10 13:37:53.089505036 -0400
+++ b/support/shell-container.c	2023-07-10 14:03:20.392920627 -0400
@@ -182,15 +182,15 @@ sleep_func (char **argv)
       return 1;
     }
   char *endptr = NULL;
-  long sec = strtol (argv[0], &endptr, 0);
+  double sec = strtod (argv[0], &endptr);
   if (endptr == argv[0] || errno == ERANGE || sec < 0)
     {
       fprintf (stderr, "sleep: invalid time interval '%s'\n", argv[0]);
       return 1;
     }
-  if (sleep (sec) < 0)
+  if (usleep ((useconds_t)(sec * 1000000.0)) < 0)
     {
-      fprintf (stderr, "sleep: failed to nanosleep\n");
+      fprintf (stderr, "sleep: failed to usleep: %s\n", strerror (errno));
       return 1;
     }
   return 0;