1  /* Copyright (C) 2002-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <string.h>
      20  #include <unistd.h>
      21  #include "pthreadP.h"
      22  
      23  #include <shlib-compat.h>
      24  
      25  
      26  struct pthread_attr *__attr_list;
      27  int __attr_list_lock = LLL_LOCK_INITIALIZER;
      28  
      29  
      30  int
      31  __pthread_attr_init (pthread_attr_t *attr)
      32  {
      33    struct pthread_attr *iattr;
      34  
      35    ASSERT_TYPE_SIZE (pthread_attr_t, __SIZEOF_PTHREAD_ATTR_T);
      36    ASSERT_PTHREAD_INTERNAL_SIZE (pthread_attr_t, struct pthread_attr);
      37  
      38    /* Many elements are initialized to zero so let us do it all at
      39       once.  This also takes care of clearing the bytes which are not
      40       internally used.  */
      41    memset (attr, '\0', __SIZEOF_PTHREAD_ATTR_T);
      42  
      43    iattr = (struct pthread_attr *) attr;
      44  
      45    /* Default guard size specified by the standard.  */
      46    iattr->guardsize = __getpagesize ();
      47  
      48    return 0;
      49  }
      50  libc_hidden_def (__pthread_attr_init)
      51  versioned_symbol (libc, __pthread_attr_init, pthread_attr_init, GLIBC_2_1);
      52  
      53  
      54  #if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_1)
      55  int
      56  __pthread_attr_init_2_0 (pthread_attr_t *attr)
      57  {
      58    /* This code is specific to the old LinuxThread code which has a too
      59       small pthread_attr_t definition.  The struct looked like
      60       this:  */
      61    struct old_attr
      62    {
      63      int detachstate;
      64      int schedpolicy;
      65      struct sched_param schedparam;
      66      int inheritsched;
      67      int scope;
      68    };
      69    struct pthread_attr *iattr;
      70  
      71    /* Many elements are initialized to zero so let us do it all at
      72       once.  This also takes care of clearing the bytes which are not
      73       internally used.  */
      74    memset (attr, '\0', sizeof (struct old_attr));
      75  
      76    iattr = (struct pthread_attr *) attr;
      77    iattr->flags |= ATTR_FLAG_OLDATTR;
      78  
      79    /* We cannot enqueue the attribute because that member is not in the
      80       old attribute structure.  */
      81    return 0;
      82  }
      83  compat_symbol (libc, __pthread_attr_init_2_0, pthread_attr_init, GLIBC_2_0);
      84  #endif