/* $NetBSD: freebsd_sched.c,v 1.11 2007/12/08 18:35:58 dsl Exp $ */ /*- * Copyright (c) 1999 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center; by Matthias Scheler. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * FreeBSD compatibility module. Try to deal with scheduler related syscalls. */ #include __KERNEL_RCSID(0, "$NetBSD: freebsd_sched.c,v 1.11 2007/12/08 18:35:58 dsl Exp $"); #include #include #include #include #include #include #include #include #include int freebsd_sys_yield(struct lwp *l, void *v, register_t *retval) { yield(); return 0; } /* * Verify access to the target process. * If we did any work this would need to return a reference to the * proc and have the mutex still held. * But we don't do anything, so it is ok. */ static int check_proc_access(struct lwp *l, pid_t pid) { struct proc *p; kauth_cred_t pc; if (pid == 0) return 0; if (pid < 0) return EINVAL; mutex_enter(&proclist_lock); p = p_find(pid, PFIND_LOCKED | PFIND_UNLOCK_FAIL); if (p == NULL) return ESRCH; pc = l->l_cred; if (!(l->l_proc == p || kauth_cred_getuid(pc) == kauth_cred_getuid(p->p_cred) || kauth_cred_geteuid(pc) == kauth_cred_getuid(p->p_cred) || kauth_cred_getuid(pc) == kauth_cred_geteuid(p->p_cred) || kauth_cred_geteuid(pc) == kauth_cred_geteuid(p->p_cred))) { mutex_exit(&proclist_lock); if (kauth_authorize_generic(pc, KAUTH_GENERIC_ISSUSER, NULL) != 0) return EPERM; } else mutex_exit(&proclist_lock); return 0; } int freebsd_sys_sched_setparam(struct lwp *l, void *v, register_t *retval) { struct freebsd_sys_sched_setparam_args /* { syscallarg(pid_t) pid; syscallarg(const struct freebsd_sched_param *) sp; } */ *uap = v; int error; struct freebsd_sched_param lp; /* * We only check for valid parameters and return afterwards. */ if (SCARG(uap, sp) == NULL) return EINVAL; error = copyin(SCARG(uap, sp), &lp, sizeof(lp)); if (error) return error; error = check_proc_access(l, SCARG(uap, pid)); if (error) return error; return 0; } int freebsd_sys_sched_getparam(struct lwp *l, void *v, register_t *retval) { struct freebsd_sys_sched_getparam_args /* { syscallarg(pid_t) pid; syscallarg(struct freebsd_sched_param *) sp; } */ *uap = v; struct freebsd_sched_param lp; int error; /* * We only check for valid parameters and return a dummy * priority afterwards. */ if (SCARG(uap, sp) == NULL) return EINVAL; error = check_proc_access(l, SCARG(uap, pid)); if (error) return error; lp.sched_priority = 0; return copyout(&lp, SCARG(uap, sp), sizeof(lp)); } int freebsd_sys_sched_setscheduler(struct lwp *l, void *v, register_t *retval) { struct freebsd_sys_sched_setscheduler_args /* { syscallarg(pid_t) pid; syscallarg(int) policy; syscallarg(cont struct freebsd_sched_scheduler *) sp; } */ *uap = v; int error; struct freebsd_sched_param lp; /* * We only check for valid parameters and return afterwards. */ if (SCARG(uap, sp) == NULL) return EINVAL; error = copyin(SCARG(uap, sp), &lp, sizeof(lp)); if (error) return error; error = check_proc_access(l, SCARG(uap, pid)); if (error) return error; /* * We can't emulate anything put the default scheduling policy. */ if (SCARG(uap, policy) != FREEBSD_SCHED_OTHER || lp.sched_priority != 0) return EINVAL; return 0; } int freebsd_sys_sched_getscheduler(struct lwp *l, void *v, register_t *retval) { struct freebsd_sys_sched_getscheduler_args /* { syscallarg(pid_t) pid; } */ *uap = v; int error; *retval = -1; /* * We only check for valid parameters and return afterwards. */ error = check_proc_access(l, SCARG(uap, pid)); if (error) return error; /* * We can't emulate anything put the default scheduling policy. */ *retval = FREEBSD_SCHED_OTHER; return 0; } int freebsd_sys_sched_yield(struct lwp *l, void *v, register_t *retval) { yield(); return 0; } int freebsd_sys_sched_get_priority_max(struct lwp *l, void *v, register_t *retval) { struct freebsd_sys_sched_get_priority_max_args /* { syscallarg(int) policy; } */ *uap = v; /* * We can't emulate anything put the default scheduling policy. */ if (SCARG(uap, policy) != FREEBSD_SCHED_OTHER) { *retval = -1; return EINVAL; } *retval = 0; return 0; } int freebsd_sys_sched_get_priority_min(struct lwp *l, void *v, register_t *retval) { struct freebsd_sys_sched_get_priority_min_args /* { syscallarg(int) policy; } */ *uap = v; /* * We can't emulate anything put the default scheduling policy. */ if (SCARG(uap, policy) != FREEBSD_SCHED_OTHER) { *retval = -1; return EINVAL; } *retval = 0; return 0; }