p1003_1b.c revision 76166
1/* 2 * Copyright (c) 1996, 1997, 1998 3 * HD Associates, Inc. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by HD Associates, Inc 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: head/sys/kern/p1003_1b.c 76166 2001-05-01 08:13:21Z markm $ 33 */ 34 35/* p1003_1b: Real Time common code. 36 */ 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/kernel.h> 41#include <sys/lock.h> 42#include <sys/module.h> 43#include <sys/mutex.h> 44#include <sys/proc.h> 45#include <sys/sysctl.h> 46#include <sys/sysent.h> 47#include <sys/syslog.h> 48#include <sys/sysproto.h> 49 50#include <posix4/posix4.h> 51 52MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B"); 53 54/* p31b_proc: Return a proc struct corresponding to a pid to operate on. 55 * 56 * Enforce permission policy. 57 * 58 * The policy is the same as for sending signals except there 59 * is no notion of process groups. 60 * 61 * pid == 0 means my process. 62 * 63 * This is disabled until I've got a permission gate in again: 64 * only root can do this. 65 */ 66 67#if 0 68/* 69 * This is stolen from CANSIGNAL in kern_sig: 70 * 71 * Can process p, with pcred pc, do "write flavor" operations to process q? 72 */ 73#define CAN_AFFECT(p, pc, q) \ 74 ((pc)->pc_ucred->cr_uid == 0 || \ 75 (pc)->p_ruid == (q)->p_cred->p_ruid || \ 76 (pc)->pc_ucred->cr_uid == (q)->p_cred->p_ruid || \ 77 (pc)->p_ruid == (q)->p_ucred->cr_uid || \ 78 (pc)->pc_ucred->cr_uid == (q)->p_ucred->cr_uid) 79#else 80#define CAN_AFFECT(p, pc, q) ((pc)->pc_ucred->cr_uid == 0) 81#endif 82 83/* 84 * p31b_proc: Look up a proc from a PID. If proc is 0 it is 85 * my own proc. 86 */ 87int p31b_proc(struct proc *p, pid_t pid, struct proc **pp) 88{ 89 int ret = 0; 90 struct proc *other_proc = 0; 91 92 if (pid == 0) { 93 other_proc = p; 94 PROC_LOCK(p); 95 } else 96 other_proc = pfind(pid); 97 98 if (other_proc) 99 { 100 /* Enforce permission policy. 101 */ 102 if (CAN_AFFECT(p, p->p_cred, other_proc)) 103 *pp = other_proc; 104 else 105 ret = EPERM; 106 PROC_UNLOCK(other_proc); 107 } 108 else 109 ret = ESRCH; 110 111 return ret; 112} 113 114/* The system calls return ENOSYS if an entry is called that is 115 * not run-time supported. I am also logging since some programs 116 * start to use this when they shouldn't. That will be removed if annoying. 117 */ 118int 119syscall_not_present(struct proc *p, const char *s, struct nosys_args *uap) 120{ 121 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n", 122 p->p_comm, p->p_pid, s); 123 124 /* a " return nosys(p, uap); " here causes a core dump. 125 */ 126 127 return ENOSYS; 128} 129 130#if !defined(_KPOSIX_PRIORITY_SCHEDULING) 131 132/* Not configured but loadable via a module: 133 */ 134 135static int sched_attach(void) 136{ 137 return 0; 138} 139 140SYSCALL_NOT_PRESENT_GEN(sched_setparam) 141SYSCALL_NOT_PRESENT_GEN(sched_getparam) 142SYSCALL_NOT_PRESENT_GEN(sched_setscheduler) 143SYSCALL_NOT_PRESENT_GEN(sched_getscheduler) 144SYSCALL_NOT_PRESENT_GEN(sched_yield) 145SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max) 146SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min) 147SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval) 148 149#else 150 151/* Configured in kernel version: 152 */ 153static struct ksched *ksched; 154 155static int sched_attach(void) 156{ 157 int ret = ksched_attach(&ksched); 158 159 if (ret == 0) 160 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1); 161 162 return ret; 163} 164 165int sched_setparam(struct proc *p, 166 struct sched_setparam_args *uap) 167{ 168 int e; 169 170 struct sched_param sched_param; 171 copyin(uap->param, &sched_param, sizeof(sched_param)); 172 173 (void) (0 174 || (e = p31b_proc(p, uap->pid, &p)) 175 || (e = ksched_setparam(&p->p_retval[0], ksched, p, 176 (const struct sched_param *)&sched_param)) 177 ); 178 179 return e; 180} 181 182int sched_getparam(struct proc *p, 183 struct sched_getparam_args *uap) 184{ 185 int e; 186 struct sched_param sched_param; 187 188 (void) (0 189 || (e = p31b_proc(p, uap->pid, &p)) 190 || (e = ksched_getparam(&p->p_retval[0], ksched, p, &sched_param)) 191 ); 192 193 if (!e) 194 copyout(&sched_param, uap->param, sizeof(sched_param)); 195 196 return e; 197} 198int sched_setscheduler(struct proc *p, 199 struct sched_setscheduler_args *uap) 200{ 201 int e; 202 203 struct sched_param sched_param; 204 copyin(uap->param, &sched_param, sizeof(sched_param)); 205 206 (void) (0 207 || (e = p31b_proc(p, uap->pid, &p)) 208 || (e = ksched_setscheduler(&p->p_retval[0], 209 ksched, p, uap->policy, 210 (const struct sched_param *)&sched_param)) 211 ); 212 213 return e; 214} 215int sched_getscheduler(struct proc *p, 216 struct sched_getscheduler_args *uap) 217{ 218 int e; 219 (void) (0 220 || (e = p31b_proc(p, uap->pid, &p)) 221 || (e = ksched_getscheduler(&p->p_retval[0], ksched, p)) 222 ); 223 224 return e; 225} 226int sched_yield(struct proc *p, 227 struct sched_yield_args *uap) 228{ 229 return ksched_yield(&p->p_retval[0], ksched); 230} 231int sched_get_priority_max(struct proc *p, 232 struct sched_get_priority_max_args *uap) 233{ 234 return ksched_get_priority_max(&p->p_retval[0], 235 ksched, uap->policy); 236} 237int sched_get_priority_min(struct proc *p, 238 struct sched_get_priority_min_args *uap) 239{ 240 return ksched_get_priority_min(&p->p_retval[0], 241 ksched, uap->policy); 242} 243int sched_rr_get_interval(struct proc *p, 244 struct sched_rr_get_interval_args *uap) 245{ 246 int e; 247 248 (void) (0 249 || (e = p31b_proc(p, uap->pid, &p)) 250 || (e = ksched_rr_get_interval(&p->p_retval[0], ksched, 251 p, uap->interval)) 252 ); 253 254 return e; 255} 256 257#endif 258 259static void p31binit(void *notused) 260{ 261 (void) sched_attach(); 262 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE); 263} 264 265SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL); 266