tests: Verify inheritance of cpu affinity

Add a couple of tests to verify that CPU affinity set using
sched_setaffinity and pthread_setaffinity_np are inherited by a child
process and child thread.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

2 files changed, 72 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 4e7044f..8a75529 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -226,6 +226,7 @@ tests += \
   tst-process_mrelease \
   tst-quota \
   tst-rlimit-infinity \
+  tst-sched-affinity-inheritance \
   tst-sched_setattr \
   tst-scm_rights \
   tst-sigtimedwait \
diff --git a/sysdeps/unix/sysv/linux/tst-sched-affinity-inheritance.c b/sysdeps/unix/sysv/linux/tst-sched-affinity-inheritance.c
new file mode 100644
index 0000000..fe0297f
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tst-sched-affinity-inheritance.c
@@ -0,0 +1,71 @@
+/* CPU Affinity inheritance test - sched_{gs}etaffinity.
+   Copyright The GNU Toolchain Authors.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* See top level comment in nptl/tst-skeleton-affinity-inheritance.c for a
+   description of this test.  */
+
+#include <sched.h>
+#include <string.h>
+#include <stdio.h>
+#include <support/check.h>
+
+static void
+set_my_affinity (size_t size, const cpu_set_t *set)
+{
+  int ret = sched_setaffinity (0, size, set);
+
+  if (ret != 0)
+    FAIL ("sched_setaffinity returned %d (%s)", ret, strerror (ret));
+}
+
+static void
+verify_my_affinity (int nproc, size_t size, const cpu_set_t *expected_set)
+{
+  cpu_set_t *set = CPU_ALLOC (nproc);
+  cpu_set_t *xor_set = CPU_ALLOC (nproc);
+
+  if (set == NULL || xor_set== NULL)
+    FAIL_EXIT1 ("verify_my_affinity: Failed to allocate cpuset: %m\n");
+
+  int ret = sched_getaffinity (0, size, set);
+  if (ret != 0)
+    FAIL ("sched_getaffinity returned %d (%s)", ret, strerror (ret));
+
+  CPU_XOR_S (size, xor_set, expected_set, set);
+
+  int cpucount = CPU_COUNT_S (size, xor_set);
+
+  if (cpucount > 0)
+    {
+      FAIL ("Affinity mask not inherited, "
+	    "following %d CPUs mismatched in the expected and actual sets:\n",
+	    cpucount);
+      for (int cur = 0; cur < nproc && cpucount >= 0; cur++)
+	if (CPU_ISSET_S (size, cur, xor_set))
+	  {
+	    printf ("%d ", cur);
+	    cpucount--;
+	  }
+      printf ("\n");
+    }
+
+  CPU_FREE (set);
+  CPU_FREE (xor_set);
+}
+
+#include <nptl/tst-skeleton-affinity-inheritance.c>