[glibc/release/2.38/master] nptl: Fix tst-cancel30 on kernels without ppoll_time64 support

[Florian Weimer <fw@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=decc9f504ae78bbee6faa49b9bca71c7eae62ea9

commit decc9f504ae78bbee6faa49b9bca71c7eae62ea9
Author: Florian Weimer <fweimer@redhat.com>
Date:   Tue Apr 23 21:16:32 2024 +0200

    nptl: Fix tst-cancel30 on kernels without ppoll_time64 support
    
    Fall back to ppoll if ppoll_time64 fails with ENOSYS.
    Fixes commit 370da8a121c3ba9eeb2f13da15fc0f21f4136b25 ("nptl: Fix
    tst-cancel30 on sparc64").
    
    Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
    (cherry picked from commit f4724843ada64a51d66f65d3199fe431f9d4c254)

Diff:
---
 sysdeps/pthread/tst-cancel30.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/sysdeps/pthread/tst-cancel30.c b/sysdeps/pthread/tst-cancel30.c
index ff803386be..ace925ca67 100644
--- a/sysdeps/pthread/tst-cancel30.c
+++ b/sysdeps/pthread/tst-cancel30.c
@@ -18,6 +18,7 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
+#include <errno.h>
 #include <support/check.h>
 #include <support/xstdio.h>
 #include <support/xthread.h>
@@ -46,13 +47,19 @@ tf (void *arg)
 
   /* Wait indefinitely for cancellation, which only works if asynchronous
      cancellation is enabled.  */
-#if defined SYS_ppoll || defined SYS_ppoll_time64
-# ifndef SYS_ppoll_time64
-#  define SYS_ppoll_time64 SYS_ppoll
+#ifdef SYS_ppoll_time64
+  long int ret = syscall (SYS_ppoll_time64, NULL, 0, NULL, NULL);
+  (void) ret;
+# ifdef SYS_ppoll
+  if (ret == -1 && errno == ENOSYS)
+    syscall (SYS_ppoll, NULL, 0, NULL, NULL);
 # endif
-  syscall (SYS_ppoll_time64, NULL, 0, NULL, NULL);
 #else
+# ifdef SYS_ppoll
+  syscall (SYS_ppoll, NULL, 0, NULL, NULL);
+# else
   for (;;);
+# endif
 #endif
 
   return 0;