1/* Copyright (C) 2003-2017 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 <http://www.gnu.org/licenses/>. */
18
19#include <assert.h>
20#include <errno.h>
21#include <pthreadP.h>
22#include <string.h>
23#include <sysdep.h>
24#include <sys/types.h>
25#include <sys/param.h>
26#include <shlib-compat.h>
27
28
29int
30__pthread_attr_getaffinity_new (const pthread_attr_t *attr, size_t cpusetsize,
31 cpu_set_t *cpuset)
32{
33 const struct pthread_attr *iattr;
34
35 assert (sizeof (*attr) >= sizeof (struct pthread_attr));
36 iattr = (const struct pthread_attr *) attr;
37
38 if (iattr->cpuset != NULL)
39 {
40 /* Check whether there are any bits set beyond the limits
41 the user requested. */
42 for (size_t cnt = cpusetsize; cnt < iattr->cpusetsize; ++cnt)
43 if (((char *) iattr->cpuset)[cnt] != 0)
44 return EINVAL;
45
46 /* Copy over the cpuset from the thread attribute object. Limit the copy
47 to the minimum of the source and destination sizes to prevent a buffer
48 overrun. If the destination is larger, fill the remaining space with
49 zeroes. */
50 void *p = mempcpy (cpuset, iattr->cpuset,
51 MIN (iattr->cpusetsize, cpusetsize));
52 if (cpusetsize > iattr->cpusetsize)
53 memset (p, '\0', cpusetsize - iattr->cpusetsize);
54 }
55 else
56 /* We have no information. */
57 memset (cpuset, -1, cpusetsize);
58
59 return 0;
60}
61versioned_symbol (libpthread, __pthread_attr_getaffinity_new,
62 pthread_attr_getaffinity_np, GLIBC_2_3_4);
63
64
65#if SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4)
66int
67__pthread_attr_getaffinity_old (const pthread_attr_t *attr, cpu_set_t *cpuset)
68{
69 /* The old interface by default assumed a 1024 processor bitmap. */
70 return __pthread_attr_getaffinity_new (attr, 128, cpuset);
71}
72compat_symbol (libpthread, __pthread_attr_getaffinity_old,
73 pthread_attr_getaffinity_np, GLIBC_2_3_3);
74#endif
75