glibc/nptl/pthread_attr_extension.c

/* Allocate the extension space for struct pthread_attr.
   Copyright (C) 2020 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
   <https://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <pthreadP.h>
#include <stdlib.h>

int
 __pthread_attr_extension (struct pthread_attr *attr)
{
  if (attr->extension != NULL)
    return 0;
  attr->extension = calloc (sizeof (*attr->extension), 1);
  if (attr->extension == NULL)
    return errno;
  return 0;
}