1 /* Deep copy of a pthread_attr_t object.
2    Copyright (C) 2020-2022 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, see
17    <https://www.gnu.org/licenses/>.  */
18 
19 #include <errno.h>
20 #include <pthreadP.h>
21 #include <stdlib.h>
22 
23 int
__pthread_attr_copy(pthread_attr_t * target,const pthread_attr_t * source)24 __pthread_attr_copy (pthread_attr_t *target, const pthread_attr_t *source)
25 {
26   /* Avoid overwriting *TARGET until all allocations have
27      succeeded.  */
28   union pthread_attr_transparent temp;
29   temp.external = *source;
30 
31   /* Force new allocation.  This function has full ownership of temp.  */
32   temp.internal.extension = NULL;
33 
34   int ret = 0;
35 
36   struct pthread_attr *isource = (struct pthread_attr *) source;
37 
38   if (isource->extension != NULL)
39     {
40       /* Propagate affinity mask information.  */
41       if (isource->extension->cpusetsize > 0)
42         ret = __pthread_attr_setaffinity_np (&temp.external,
43                                              isource->extension->cpusetsize,
44                                              isource->extension->cpuset);
45 
46       /* Propagate the signal mask information.  */
47       if (ret == 0 && isource->extension->sigmask_set)
48         ret = __pthread_attr_setsigmask_internal ((pthread_attr_t *) &temp,
49                                                   &isource->extension->sigmask);
50     }
51 
52   if (ret != 0)
53     {
54       /* Deallocate because we have ownership.  */
55       __pthread_attr_destroy (&temp.external);
56       return ret;
57     }
58 
59   /* Transfer ownership.  *target is not assumed to have been
60      initialized.  */
61   *target = temp.external;
62   return 0;
63 }
64 libc_hidden_def (__pthread_attr_copy)
65