1 /*- 2 * Copyright (c) 2021 The FreeBSD Foundation 3 * 4 * This software were developed by Konstantin Belousov <kib@FreeBSD.org> 5 * under sponsorship from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #define _WANT_P_OSREL 30 #include <sys/param.h> 31 #include <sys/sysctl.h> 32 #include <errno.h> 33 #include <sched.h> 34 #include <string.h> 35 36 #include "libc_private.h" 37 38 int 39 sched_setaffinity(pid_t pid, size_t cpusetsz, const cpuset_t *cpuset) 40 { 41 static int mp_maxid; 42 cpuwhich_t which; 43 cpuset_t c; 44 int error, lbs, cpu; 45 size_t len, sz; 46 47 if (__getosreldate() < P_OSREL_TIDPID) { 48 if (pid == 0 || pid > _PID_MAX) 49 which = CPU_WHICH_TID; 50 else 51 which = CPU_WHICH_PID; 52 } else 53 which = CPU_WHICH_TIDPID; 54 55 sz = cpusetsz > sizeof(cpuset_t) ? sizeof(cpuset_t) : cpusetsz; 56 memset(&c, 0, sizeof(c)); 57 memcpy(&c, cpuset, sz); 58 59 /* Linux ignores high bits */ 60 if (mp_maxid == 0) { 61 len = sizeof(mp_maxid); 62 error = sysctlbyname("kern.smp.maxid", &mp_maxid, &len, 63 NULL, 0); 64 if (error == -1) 65 return (error); 66 } 67 lbs = CPU_FLS(&c) - 1; 68 if (lbs > mp_maxid) { 69 CPU_FOREACH_ISSET(cpu, &c) 70 if (cpu > mp_maxid) 71 CPU_CLR(cpu, &c); 72 } 73 error = cpuset_setaffinity(CPU_LEVEL_WHICH, which, 74 pid == 0 ? -1 : pid, sizeof(cpuset_t), &c); 75 if (error == -1 && errno == EDEADLK) 76 errno = EINVAL; 77 78 return (error); 79 } 80