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cbc32e4c5e
To allow to run a newer world on a pre-1400079 kernel a compat shims to the sched_affinity functions has beed added. Reported by: antoine Tested by: antoine Reviewed by: kib Differential revision: https://reviews.freebsd.org/D38555 MFC after: 3 days
80 lines
2.5 KiB
C
80 lines
2.5 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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#define _WANT_P_OSREL
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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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#include "libc_private.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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cpuwhich_t which;
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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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if (__getosreldate() < P_OSREL_TIDPID) {
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if (pid == 0 || pid > _PID_MAX)
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which = CPU_WHICH_TID;
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else
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which = CPU_WHICH_PID;
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} else
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which = CPU_WHICH_TIDPID;
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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, which,
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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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