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/*-
* Copyright (c) 2021 The FreeBSD Foundation
*
* This software were developed by Konstantin Belousov <kib@FreeBSD.org>
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define _WANT_P_OSREL
#include <sys/param.h>
#include <sys/sysctl.h>
#include <errno.h>
#include <sched.h>
#include <string.h>
#include "libc_private.h"
int
sched_setaffinity(pid_t pid, size_t cpusetsz, const cpuset_t *cpuset)
{
static int mp_maxid;
cpuwhich_t which;
cpuset_t c;
int error, lbs, cpu;
size_t len, sz;
if (__getosreldate() < P_OSREL_TIDPID) {
if (pid == 0 || pid > _PID_MAX)
which = CPU_WHICH_TID;
else
which = CPU_WHICH_PID;
} else
which = CPU_WHICH_TIDPID;
sz = cpusetsz > sizeof(cpuset_t) ? sizeof(cpuset_t) : cpusetsz;
memset(&c, 0, sizeof(c));
memcpy(&c, cpuset, sz);
/* Linux ignores high bits */
if (mp_maxid == 0) {
len = sizeof(mp_maxid);
error = sysctlbyname("kern.smp.maxid", &mp_maxid, &len,
NULL, 0);
if (error == -1)
return (error);
}
lbs = CPU_FLS(&c) - 1;
if (lbs > mp_maxid) {
CPU_FOREACH_ISSET(cpu, &c)
if (cpu > mp_maxid)
CPU_CLR(cpu, &c);
}
error = cpuset_setaffinity(CPU_LEVEL_WHICH, which,
pid == 0 ? -1 : pid, sizeof(cpuset_t), &c);
if (error == -1 && errno == EDEADLK)
errno = EINVAL;
return (error);
}
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