/* * Copyright (c) 1996, 1997, 1998 * HD Associates, Inc. All rights reserved. * * 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 HD Associates, Inc * 4. Neither the name of the author nor the names of any co-contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES 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 HD ASSOCIATES 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: src/sys/posix4/p1003_1b.c,v 1.5.2.2 2003/03/25 06:13:35 rwatson Exp $ * $DragonFly: src/sys/kern/kern_p1003_1b.c,v 1.10 2007/06/26 19:31:08 dillon Exp $ */ /* p1003_1b: Real Time common code. */ #include #include #include #include #include #include #include #include #include #include MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B"); /* p31b_proc: Return a proc struct corresponding to a pid to operate on. * * Enforce permission policy. * * The policy is the same as for sending signals except there * is no notion of process groups. * * pid == 0 means my process. * * This is disabled until I've got a permission gate in again: * only root can do this. */ #if 0 /* * This is stolen from CANSIGNAL in kern_sig: * * Can process p, with pcred pc, do "write flavor" operations to process q? */ #define CAN_AFFECT(p, cr, q) \ ((cr)->cr_uid == 0 || \ (cr)->cr_ruid == (q)->p_ucred->cr_ruid || \ (cr)->cr_uid == (q)->p_ucred->cr_ruid || \ (cr)->cr_ruid == (q)->p_ucred->cr_uid || \ (cr)->cr_uid == (q)->p_ucred->cr_uid) #else #define CAN_AFFECT(p, cr, q) ((cr)->cr_uid == 0) #endif /* * p31b_proc: Look up a proc from a PID. If proc is 0 it is * my own proc. */ int p31b_proc(struct proc *p, pid_t pid, struct proc **pp) { int ret = 0; struct proc *other_proc = 0; if (pid == 0) other_proc = p; else other_proc = pfind(pid); if (other_proc) { /* Enforce permission policy. */ if (CAN_AFFECT(p, p->p_ucred, other_proc)) *pp = other_proc; else ret = EPERM; } else ret = ESRCH; return ret; } #if !defined(_KPOSIX_PRIORITY_SCHEDULING) int syscall_not_present(const char *s); /* The system calls return ENOSYS if an entry is called that is * not run-time supported. I am also logging since some programs * start to use this when they shouldn't. That will be removed if annoying. */ int syscall_not_present(const char *s) { struct proc *p = curproc; log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n", p->p_comm, p->p_pid, s); /* a " return nosys(p, uap); " here causes a core dump. */ return ENOSYS; } /* Not configured but loadable via a module: */ static int sched_attach(void) { return 0; } #define SYSCALL_NOT_PRESENT_GEN(SC) \ int SC (struct SC##_args *uap) \ { \ return syscall_not_present(#SC); \ } SYSCALL_NOT_PRESENT_GEN(sched_setparam) SYSCALL_NOT_PRESENT_GEN(sched_getparam) SYSCALL_NOT_PRESENT_GEN(sched_setscheduler) SYSCALL_NOT_PRESENT_GEN(sched_getscheduler) SYSCALL_NOT_PRESENT_GEN(sched_yield) SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max) SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min) SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval) #else /* Configured in kernel version: */ static struct ksched *ksched; static int sched_attach(void) { int ret = ksched_attach(&ksched); if (ret == 0) p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1); return ret; } int sys_sched_setparam(struct sched_setparam_args *uap) { struct proc *p = curproc; struct lwp *lp; int e; struct sched_param sched_param; copyin(uap->param, &sched_param, sizeof(sched_param)); if ((e = p31b_proc(p, uap->pid, &p)) == 0) { lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ e = ksched_setparam(&uap->sysmsg_result, ksched, lp, (const struct sched_param *)&sched_param); } return e; } int sys_sched_getparam(struct sched_getparam_args *uap) { struct proc *p = curproc; struct proc *targetp; struct lwp *lp; struct sched_param sched_param; int e; if (uap->pid != 0 && uap->pid != p->p_pid) { e = p31b_proc(p, uap->pid, &targetp); if (e) return e; } else { targetp = p; } lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */ e = ksched_getparam(&uap->sysmsg_result, ksched, lp, &sched_param); if (!e) copyout(&sched_param, uap->param, sizeof(sched_param)); return e; } int sys_sched_setscheduler(struct sched_setscheduler_args *uap) { struct proc *p = curproc; struct lwp *lp; int e; struct sched_param sched_param; copyin(uap->param, &sched_param, sizeof(sched_param)); if ((e = p31b_proc(p, uap->pid, &p)) == 0) { lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ e = ksched_setscheduler(&uap->sysmsg_result, ksched, lp, uap->policy, (const struct sched_param *)&sched_param); } return e; } int sys_sched_getscheduler(struct sched_getscheduler_args *uap) { struct proc *p = curproc; struct proc *targetp; struct lwp *lp; int e; if (uap->pid != 0 && uap->pid != p->p_pid) { e = p31b_proc(p, uap->pid, &targetp); if (e) return e; } else { targetp = p; } lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */ e = ksched_getscheduler(&uap->sysmsg_result, ksched, lp); return e; } int sys_sched_yield(struct sched_yield_args *uap) { return ksched_yield(&uap->sysmsg_result, ksched); } int sys_sched_get_priority_max(struct sched_get_priority_max_args *uap) { return ksched_get_priority_max(&uap->sysmsg_result, ksched, uap->policy); } int sys_sched_get_priority_min(struct sched_get_priority_min_args *uap) { return ksched_get_priority_min(&uap->sysmsg_result, ksched, uap->policy); } int sys_sched_rr_get_interval(struct sched_rr_get_interval_args *uap) { int e; struct proc *p = curproc; struct lwp *lp = curthread->td_lwp; if ((e = p31b_proc(p, uap->pid, &p)) == 0) { e = ksched_rr_get_interval(&uap->sysmsg_result, ksched, lp, uap->interval); } return e; } #endif static void p31binit(void *notused) { (void) sched_attach(); p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE); } SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);