NPTL: Refactor cpu_set_t validation to be sysdeps-controlled

This removes Linuxisms related to cpu_set_t validation from the
generic NPTL code and puts them into a new sysdeps header file.

ChangeLog

@@ -1,3 +1,11 @@
+2015-01-08  Roland McGrath  <roland@hack.frob.com>
+
+	* nptl/pthreadP.h (check_cpuset_attr): Moved ...
+	* sysdeps/unix/sysv/linux/check-cpuset.h: ... to this new file.
+	* nptl/pthread_attr_setaffinity.c: Include it.
+	* nptl/pthread_setattr_default_np.c: Likewise.
+	* nptl/check-cpuset.h: New file.
+
 2015-01-08  Richard Henderson  <rth@redhat.com>
 
 	* elf/Makefile (CFLAGS-tst-execstack-mod.c): Add -Wno-trampolines

nptl/check-cpuset.h

@@ -0,0 +1,32 @@
+/* Validate cpu_set_t values for NPTL.  Stub version.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+
+/* Returns 0 if CS and SZ are valid values for the cpuset and cpuset size
+   respectively.  Otherwise it returns an error number.  */
+static inline int
+check_cpuset_attr (const cpu_set_t *cs, const size_t sz)
+{
+  if (sz == 0)
+    return 0;
+
+  /* This means pthread_attr_setaffinity will return ENOSYS, which
+     is the right thing when the cpu_set_t features are not available.  */
+  return ENOSYS;
+}

nptl/pthreadP.h

@@ -629,31 +629,4 @@ check_stacksize_attr (size_t st)
   return EINVAL;
 }
 
-/* Defined in pthread_setaffinity.c.  */
-extern size_t __kernel_cpumask_size attribute_hidden;
-extern int __determine_cpumask_size (pid_t tid);
-
-/* Returns 0 if CS and SZ are valid values for the cpuset and cpuset size
-   respectively.  Otherwise it returns an error number.  */
-static inline int
-check_cpuset_attr (const cpu_set_t *cs, const size_t sz)
-{
-  if (__kernel_cpumask_size == 0)
-    {
-      int res = __determine_cpumask_size (THREAD_SELF->tid);
-      if (res)
-	return res;
-    }
-
-  /* Check whether the new bitmask has any bit set beyond the
-     last one the kernel accepts.  */
-  for (size_t cnt = __kernel_cpumask_size; cnt < sz; ++cnt)
-    if (((char *) cs)[cnt] != '\0')
-      /* Found a nonzero byte.  This means the user request cannot be
-	 fulfilled.  */
-      return EINVAL;
-
-  return 0;
-}
-
 #endif	/* pthreadP.h */

nptl/pthread_attr_setaffinity.c

@@ -23,8 +23,7 @@
 #include <string.h>
 #include <pthreadP.h>
 #include <shlib-compat.h>
-
-
+#include <check-cpuset.h>
 
 
 int

nptl/pthread_setattr_default_np.c

@@ -21,6 +21,8 @@
 #include <pthreadP.h>
 #include <assert.h>
 #include <string.h>
+#include <check-cpuset.h>
+
 
 int
 pthread_setattr_default_np (const pthread_attr_t *in)

sysdeps/unix/sysv/linux/check-cpuset.h

@@ -0,0 +1,48 @@
+/* Validate cpu_set_t values for NPTL.  Linux version.
+   Copyright (C) 2002-2015 Free Software Foundation, Inc.
+   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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <pthread.h>
+#include <errno.h>
+
+
+/* Defined in pthread_setaffinity.c.  */
+extern size_t __kernel_cpumask_size attribute_hidden;
+extern int __determine_cpumask_size (pid_t tid);
+
+/* Returns 0 if CS and SZ are valid values for the cpuset and cpuset size
+   respectively.  Otherwise it returns an error number.  */
+static inline int
+check_cpuset_attr (const cpu_set_t *cs, const size_t sz)
+{
+  if (__kernel_cpumask_size == 0)
+    {
+      int res = __determine_cpumask_size (THREAD_SELF->tid);
+      if (res)
+	return res;
+    }
+
+  /* Check whether the new bitmask has any bit set beyond the
+     last one the kernel accepts.  */
+  for (size_t cnt = __kernel_cpumask_size; cnt < sz; ++cnt)
+    if (((char *) cs)[cnt] != '\0')
+      /* Found a nonzero byte.  This means the user request cannot be
+	 fulfilled.  */
+      return EINVAL;
+
+  return 0;
+}