f35093f8d6
Linux has more tolerant checks of the user supplied cpuset_t's. Minimum cpuset_t size that the Linux kernel permits in case of getaffinity() is the maximum CPU id, present in the system / NBBY, the maximum size is not limited. For setaffinity(), Linux does not limit the size of the user-provided cpuset_t, internally using only the meaningful part of the set, where the upper bound is the maximum CPU id, present in the system, no larger than the size of the kernel cpuset_t. Unlike FreeBSD, Linux ignores high bits if set in the setaffinity(), so clear it in the sched_setaffinity() and Linuxulator itself. Reviewed by: Pau Amma (man pages) In collaboration with: jhb Differential revision: https://reviews.freebsd.org/D34849 MFC after: 2 weeks
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/*-
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* Copyright (c) 2021 The FreeBSD Foundation
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*
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* This software were developed by Konstantin Belousov <kib@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <errno.h>
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#include <sched.h>
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#include <string.h>
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int
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sched_setaffinity(pid_t pid, size_t cpusetsz, const cpuset_t *cpuset)
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{
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static int mp_maxid;
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cpuset_t c;
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int error, lbs, cpu;
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size_t len, sz;
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sz = cpusetsz > sizeof(cpuset_t) ? sizeof(cpuset_t) : cpusetsz;
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memset(&c, 0, sizeof(c));
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memcpy(&c, cpuset, sz);
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/* Linux ignores high bits */
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if (mp_maxid == 0) {
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len = sizeof(mp_maxid);
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error = sysctlbyname("kern.smp.maxid", &mp_maxid, &len,
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NULL, 0);
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if (error == -1)
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return (error);
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}
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lbs = CPU_FLS(&c) - 1;
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if (lbs > mp_maxid) {
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CPU_FOREACH_ISSET(cpu, &c)
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if (cpu > mp_maxid)
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CPU_CLR(cpu, &c);
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}
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error = cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID,
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pid == 0 ? -1 : pid, sizeof(cpuset_t), &c);
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if (error == -1 && errno == EDEADLK)
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errno = EINVAL;
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return (error);
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}
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