/* * 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 $ */ /* p1003_1b: Real Time common code. */ #include #include #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 #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 sys_##SC (struct sysmsg *sysmsg, const 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 /* * p31b_proc: Look up a proc from a PID. If proc is 0 it is * my own proc. * * Returns a held process in *pp. */ static int p31b_proc(pid_t pid, struct proc **pp) { int ret = 0; struct proc *p = curproc; struct proc *other_proc; if (pid == 0) { other_proc = p; if (other_proc) PHOLD(other_proc); } else { other_proc = pfind(pid); /* ref from pfind() */ } if (other_proc) { /* Enforce permission policy. */ if (CAN_AFFECT(p, p->p_ucred, other_proc)) { *pp = other_proc; lwkt_gettoken(&other_proc->p_token); } else { *pp = NULL; ret = EPERM; PRELE(other_proc); } } else { *pp = NULL; ret = ESRCH; } return ret; } static void p31b_proc_done(struct proc *other_proc) { if (other_proc) { lwkt_reltoken(&other_proc->p_token); PRELE(other_proc); } } /* 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 sysmsg *sysmsg, const struct sched_setparam_args *uap) { struct proc *p; struct lwp *lp; struct sched_param sched_param; int e; copyin(uap->param, &sched_param, sizeof(sched_param)); if ((e = p31b_proc(uap->pid, &p)) == 0) { lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ if (lp) { LWPHOLD(lp); lwkt_gettoken(&lp->lwp_token); e = ksched_setparam(&sysmsg->sysmsg_reg, ksched, lp, (const struct sched_param *)&sched_param); lwkt_reltoken(&lp->lwp_token); LWPRELE(lp); } else { e = ESRCH; } p31b_proc_done(p); } return e; } int sys_sched_getparam(struct sysmsg *sysmsg, const struct sched_getparam_args *uap) { struct proc *targetp; struct lwp *lp; struct sched_param sched_param; int e; if ((e = p31b_proc(uap->pid, &targetp)) == 0) { lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */ if (lp) { LWPHOLD(lp); lwkt_gettoken(&lp->lwp_token); e = ksched_getparam(&sysmsg->sysmsg_reg, ksched, lp, &sched_param); lwkt_reltoken(&lp->lwp_token); LWPRELE(lp); } else { e = ESRCH; } p31b_proc_done(targetp); } if (e == 0) copyout(&sched_param, uap->param, sizeof(sched_param)); return e; } int sys_sched_setscheduler(struct sysmsg *sysmsg, const struct sched_setscheduler_args *uap) { struct proc *p; struct lwp *lp; int e; struct sched_param sched_param; copyin(uap->param, &sched_param, sizeof(sched_param)); if ((e = p31b_proc(uap->pid, &p)) == 0) { lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ if (lp) { LWPHOLD(lp); lwkt_gettoken(&lp->lwp_token); e = ksched_setscheduler(&sysmsg->sysmsg_reg, ksched, lp, uap->policy, (const struct sched_param *)&sched_param); lwkt_reltoken(&lp->lwp_token); LWPRELE(lp); } else { e = ESRCH; } p31b_proc_done(p); } return e; } int sys_sched_getscheduler(struct sysmsg *sysmsg, const struct sched_getscheduler_args *uap) { struct proc *targetp; struct lwp *lp; int e; if ((e = p31b_proc(uap->pid, &targetp)) == 0) { lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */ if (lp) { LWPHOLD(lp); lwkt_gettoken(&lp->lwp_token); e = ksched_getscheduler(&sysmsg->sysmsg_reg, ksched, lp); lwkt_reltoken(&lp->lwp_token); LWPRELE(lp); } else { e = ESRCH; } p31b_proc_done(targetp); } return e; } /* * MPSAFE */ int sys_sched_yield(struct sysmsg *sysmsg, const struct sched_yield_args *uap) { return ksched_yield(&sysmsg->sysmsg_reg, ksched); } /* * MPSAFE */ int sys_sched_get_priority_max(struct sysmsg *sysmsg, const struct sched_get_priority_max_args *uap) { return ksched_get_priority_max(&sysmsg->sysmsg_reg, ksched, uap->policy); } /* * MPSAFE */ int sys_sched_get_priority_min(struct sysmsg *sysmsg, const struct sched_get_priority_min_args *uap) { return ksched_get_priority_min(&sysmsg->sysmsg_reg, ksched, uap->policy); } int sys_sched_rr_get_interval(struct sysmsg *sysmsg, const struct sched_rr_get_interval_args *uap) { int e; struct proc *p; struct lwp *lp; struct timespec ts; if ((e = p31b_proc(uap->pid, &p)) == 0) { lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ if (lp) { LWPHOLD(lp); lwkt_gettoken(&lp->lwp_token); e = ksched_rr_get_interval(&sysmsg->sysmsg_reg, ksched, lp, &ts); if (e == 0) e = copyout(&ts, uap->interval, sizeof(ts)); lwkt_reltoken(&lp->lwp_token); LWPRELE(lp); } else { e = ESRCH; } p31b_proc_done(p); } return e; } #endif static void p31binit(void *notused) { sched_attach(); p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, -1); p31b_setcfg(CTL_P1003_1B_FSYNC, _POSIX_FSYNC); p31b_setcfg(CTL_P1003_1B_MAPPED_FILES, _POSIX_MAPPED_FILES); p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING); p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE); p31b_setcfg(CTL_P1003_1B_SEMAPHORES, _POSIX_SEMAPHORES); p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, 256); p31b_setcfg(CTL_P1003_1B_SHARED_MEMORY_OBJECTS, _POSIX_SHARED_MEMORY_OBJECTS); #if 0 /* XXX missing */ p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, _POSIX_ASYNCHRONOUS_IO); p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0); p31b_setcfg(CTL_P1003_1B_AIO_MAX, 0); p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, 0); p31b_setcfg(CTL_P1003_1B_DELAYTIMER_MAX, 0); p31b_setcfg(CTL_P1003_1B_MEMLOCK, 0); p31b_setcfg(CTL_P1003_1B_MEMLOCK_RANGE, 0); p31b_setcfg(CTL_P1003_1B_MEMORY_PROTECTION, 0); p31b_setcfg(CTL_P1003_1B_PRIORITIZED_IO, _POSIX_PRIORITIZED_IO); p31b_setcfg(CTL_P1003_1B_REALTIME_SIGNALS, _POSIX_REALTIME_SIGNALS); p31b_setcfg(CTL_P1003_1B_RTSIG_MAX, SIGRTMAX - SIGRTMIN + 1); p31b_setcfg(CTL_P1003_1B_SIGQUEUE_MAX, 0); p31b_setcfg(CTL_P1003_1B_SYNCHRONIZED_IO, _POSIX_SYNCHRONIZED_IO); p31b_setcfg(CTL_P1003_1B_TIMERS, _POSIX_TIMERS); p31b_setcfg(CTL_P1003_1B_TIMER_MAX, 0); #endif } SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);