1/* Copyright (C) 2003-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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 <string.h>
22#include <sysdep.h>
23#include <sys/types.h>
24#include <sys/param.h>
25#include <shlib-compat.h>
26
27
28int
29__pthread_attr_getaffinity_new (const pthread_attr_t *attr, size_t cpusetsize,
30 cpu_set_t *cpuset)
31{
32 const struct pthread_attr *iattr;
33
34 iattr = (const struct pthread_attr *) attr;
35
36 if (iattr->extension != NULL && iattr->extension->cpuset != NULL)
37 {
38 /* Check whether there are any bits set beyond the limits
39 the user requested. */
40 for (size_t cnt = cpusetsize; cnt < iattr->extension->cpusetsize; ++cnt)
41 if (((char *) iattr->extension->cpuset)[cnt] != 0)
42 return EINVAL;
43
44 /* Copy over the cpuset from the thread attribute object. Limit the copy
45 to the minimum of the source and destination sizes to prevent a buffer
46 overrun. If the destination is larger, fill the remaining space with
47 zeroes. */
48 void *p = mempcpy (cpuset, iattr->extension->cpuset,
49 MIN (iattr->extension->cpusetsize, cpusetsize));
50 if (cpusetsize > iattr->extension->cpusetsize)
51 memset (p, '\0', cpusetsize - iattr->extension->cpusetsize);
52 }
53 else
54 /* We have no information. */
55 memset (cpuset, -1, cpusetsize);
56
57 return 0;
58}
59versioned_symbol (libpthread, __pthread_attr_getaffinity_new,
60 pthread_attr_getaffinity_np, GLIBC_2_3_4);
61
62
63#if SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4)
64int
65__pthread_attr_getaffinity_old (const pthread_attr_t *attr, cpu_set_t *cpuset)
66{
67 /* The old interface by default assumed a 1024 processor bitmap. */
68 return __pthread_attr_getaffinity_new (attr, 128, cpuset);
69}
70compat_symbol (libpthread, __pthread_attr_getaffinity_old,
71 pthread_attr_getaffinity_np, GLIBC_2_3_3);
72#endif
73