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: src/sys/posix4/p1003_1b.c,v 1.5.2.2 2003/03/25 06:13:35 rwatson Exp $ 33 * $DragonFly: src/sys/kern/kern_p1003_1b.c,v 1.4 2003/07/26 18:12:45 dillon Exp $ 34 */ 35 36 /* p1003_1b: Real Time common code. 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/sysent.h> 43 #include <sys/proc.h> 44 #include <sys/syslog.h> 45 #include <sys/module.h> 46 #include <sys/sysproto.h> 47 #include <sys/sysctl.h> 48 49 #include <posix4/posix4.h> 50 51 MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B"); 52 53 /* p31b_proc: Return a proc struct corresponding to a pid to operate on. 54 * 55 * Enforce permission policy. 56 * 57 * The policy is the same as for sending signals except there 58 * is no notion of process groups. 59 * 60 * pid == 0 means my process. 61 * 62 * This is disabled until I've got a permission gate in again: 63 * only root can do this. 64 */ 65 66 #if 0 67 /* 68 * This is stolen from CANSIGNAL in kern_sig: 69 * 70 * Can process p, with pcred pc, do "write flavor" operations to process q? 71 */ 72 #define CAN_AFFECT(p, cr, q) \ 73 ((cr)->cr_uid == 0 || \ 74 (cr)->cr_ruid == (q)->p_ucred->cr_ruid || \ 75 (cr)->cr_uid == (q)->p_ucred->cr_ruid || \ 76 (cr)->cr_ruid == (q)->p_ucred->cr_uid || \ 77 (cr)->cr_uid == (q)->p_ucred->cr_uid) 78 #else 79 #define CAN_AFFECT(p, cr, q) ((cr)->cr_uid == 0) 80 #endif 81 82 /* 83 * p31b_proc: Look up a proc from a PID. If proc is 0 it is 84 * my own proc. 85 */ 86 int p31b_proc(struct proc *p, pid_t pid, struct proc **pp) 87 { 88 int ret = 0; 89 struct proc *other_proc = 0; 90 91 if (pid == 0) 92 other_proc = p; 93 else 94 other_proc = pfind(pid); 95 96 if (other_proc) 97 { 98 /* Enforce permission policy. 99 */ 100 if (CAN_AFFECT(p, p->p_ucred, other_proc)) 101 *pp = other_proc; 102 else 103 ret = EPERM; 104 } 105 else 106 ret = ESRCH; 107 108 return ret; 109 } 110 111 /* The system calls return ENOSYS if an entry is called that is 112 * not run-time supported. I am also logging since some programs 113 * start to use this when they shouldn't. That will be removed if annoying. 114 */ 115 int 116 syscall_not_present(struct proc *p, const char *s, struct nosys_args *uap) 117 { 118 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n", 119 p->p_comm, p->p_pid, s); 120 121 /* a " return nosys(p, uap); " here causes a core dump. 122 */ 123 124 return ENOSYS; 125 } 126 127 #if !defined(_KPOSIX_PRIORITY_SCHEDULING) 128 129 /* Not configured but loadable via a module: 130 */ 131 132 static int sched_attach(void) 133 { 134 return 0; 135 } 136 137 SYSCALL_NOT_PRESENT_GEN(sched_setparam) 138 SYSCALL_NOT_PRESENT_GEN(sched_getparam) 139 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler) 140 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler) 141 SYSCALL_NOT_PRESENT_GEN(sched_yield) 142 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max) 143 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min) 144 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval) 145 146 #else 147 148 /* Configured in kernel version: 149 */ 150 static struct ksched *ksched; 151 152 static int sched_attach(void) 153 { 154 int ret = ksched_attach(&ksched); 155 156 if (ret == 0) 157 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1); 158 159 return ret; 160 } 161 162 int 163 sched_setparam(struct sched_setparam_args *uap) 164 { 165 struct proc *p = curproc; 166 int e; 167 168 struct sched_param sched_param; 169 copyin(uap->param, &sched_param, sizeof(sched_param)); 170 171 if ((e = p31b_proc(p, uap->pid, &p)) == 0) { 172 e = ksched_setparam(&uap->lmsg.u.ms_result, ksched, p, 173 (const struct sched_param *)&sched_param); 174 } 175 return e; 176 } 177 178 int 179 sched_getparam(struct sched_getparam_args *uap) 180 { 181 struct proc *p = curproc; 182 struct proc *targetp; 183 struct sched_param sched_param; 184 int e; 185 186 if (uap->pid != 0 && uap->pid != p->p_pid) { 187 e = p31b_proc(p, uap->pid, &targetp); 188 if (e) 189 return e; 190 } else { 191 targetp = p; 192 } 193 194 e = ksched_getparam(&uap->lmsg.u.ms_result, ksched, targetp, &sched_param); 195 196 if (!e) 197 copyout(&sched_param, uap->param, sizeof(sched_param)); 198 199 return e; 200 } 201 202 int 203 sched_setscheduler(struct sched_setscheduler_args *uap) 204 { 205 struct proc *p = curproc; 206 int e; 207 208 struct sched_param sched_param; 209 copyin(uap->param, &sched_param, sizeof(sched_param)); 210 211 if ((e = p31b_proc(p, uap->pid, &p)) == 0) { 212 e = ksched_setscheduler(&uap->lmsg.u.ms_result, ksched, p, 213 uap->policy, (const struct sched_param *)&sched_param); 214 } 215 return e; 216 } 217 218 int 219 sched_getscheduler(struct sched_getscheduler_args *uap) 220 { 221 struct proc *p = curproc; 222 struct proc *targetp; 223 int e; 224 225 if (uap->pid != 0 && uap->pid != p->p_pid) { 226 e = p31b_proc(p, uap->pid, &targetp); 227 if (e) 228 return e; 229 } else { 230 targetp = p; 231 } 232 233 e = ksched_getscheduler(&uap->lmsg.u.ms_result, ksched, targetp); 234 235 return e; 236 } 237 238 int 239 sched_yield(struct sched_yield_args *uap) 240 { 241 return ksched_yield(&uap->lmsg.u.ms_result, ksched); 242 } 243 244 int 245 sched_get_priority_max(struct sched_get_priority_max_args *uap) 246 { 247 return ksched_get_priority_max(&uap->lmsg.u.ms_result, ksched, uap->policy); 248 } 249 250 int 251 sched_get_priority_min(struct sched_get_priority_min_args *uap) 252 { 253 return ksched_get_priority_min(&uap->lmsg.u.ms_result, ksched, uap->policy); 254 } 255 256 int 257 sched_rr_get_interval(struct sched_rr_get_interval_args *uap) 258 { 259 int e; 260 struct proc *p = curproc; 261 262 if ((e = p31b_proc(p, uap->pid, &p)) == 0) { 263 e = ksched_rr_get_interval(&uap->lmsg.u.ms_result, ksched, 264 p, uap->interval); 265 } 266 return e; 267 } 268 269 #endif 270 271 static void p31binit(void *notused) 272 { 273 (void) sched_attach(); 274 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE); 275 } 276 277 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL); 278