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 1.9 2007/02/03 17:05:57 corecode 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.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 } 110 111 112 #if !defined(_KPOSIX_PRIORITY_SCHEDULING) 113 114 int syscall_not_present(const char *s); 115 116 /* The system calls return ENOSYS if an entry is called that is 117 * not run-time supported. I am also logging since some programs 118 * start to use this when they shouldn't. That will be removed if annoying. 119 */ 120 int syscall_not_present(const char *s) 121 { 122 struct proc *p = curproc; 123 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n", 124 p->p_comm, p->p_pid, s); 125 126 /* a " return nosys(p, uap); " here causes a core dump. 127 */ 128 129 return ENOSYS; 130 } 131 132 /* Not configured but loadable via a module: 133 */ 134 135 static int sched_attach(void) 136 { 137 return 0; 138 } 139 140 #define SYSCALL_NOT_PRESENT_GEN(SC) \ 141 int SC (struct SC##_args *uap) \ 142 { \ 143 return syscall_not_present(#SC); \ 144 } 145 146 SYSCALL_NOT_PRESENT_GEN(sched_setparam) 147 SYSCALL_NOT_PRESENT_GEN(sched_getparam) 148 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler) 149 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler) 150 SYSCALL_NOT_PRESENT_GEN(sched_yield) 151 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max) 152 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min) 153 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval) 154 155 #else 156 157 /* Configured in kernel version: 158 */ 159 static struct ksched *ksched; 160 161 static int sched_attach(void) 162 { 163 int ret = ksched_attach(&ksched); 164 165 if (ret == 0) 166 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1); 167 168 return ret; 169 } 170 171 int 172 sys_sched_setparam(struct sched_setparam_args *uap) 173 { 174 struct proc *p = curproc; 175 struct lwp *lp; 176 int e; 177 178 struct sched_param sched_param; 179 copyin(uap->param, &sched_param, sizeof(sched_param)); 180 181 if ((e = p31b_proc(p, uap->pid, &p)) == 0) { 182 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ 183 e = ksched_setparam(&uap->sysmsg_result, ksched, lp, 184 (const struct sched_param *)&sched_param); 185 } 186 return e; 187 } 188 189 int 190 sys_sched_getparam(struct sched_getparam_args *uap) 191 { 192 struct proc *p = curproc; 193 struct proc *targetp; 194 struct lwp *lp; 195 struct sched_param sched_param; 196 int e; 197 198 if (uap->pid != 0 && uap->pid != p->p_pid) { 199 e = p31b_proc(p, uap->pid, &targetp); 200 if (e) 201 return e; 202 } else { 203 targetp = p; 204 } 205 206 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */ 207 e = ksched_getparam(&uap->sysmsg_result, ksched, lp, &sched_param); 208 209 if (!e) 210 copyout(&sched_param, uap->param, sizeof(sched_param)); 211 212 return e; 213 } 214 215 int 216 sys_sched_setscheduler(struct sched_setscheduler_args *uap) 217 { 218 struct proc *p = curproc; 219 struct lwp *lp; 220 int e; 221 222 struct sched_param sched_param; 223 copyin(uap->param, &sched_param, sizeof(sched_param)); 224 225 if ((e = p31b_proc(p, uap->pid, &p)) == 0) { 226 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ 227 e = ksched_setscheduler(&uap->sysmsg_result, ksched, lp, 228 uap->policy, (const struct sched_param *)&sched_param); 229 } 230 return e; 231 } 232 233 int 234 sys_sched_getscheduler(struct sched_getscheduler_args *uap) 235 { 236 struct proc *p = curproc; 237 struct proc *targetp; 238 struct lwp *lp; 239 int e; 240 241 if (uap->pid != 0 && uap->pid != p->p_pid) { 242 e = p31b_proc(p, uap->pid, &targetp); 243 if (e) 244 return e; 245 } else { 246 targetp = p; 247 } 248 249 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */ 250 e = ksched_getscheduler(&uap->sysmsg_result, ksched, lp); 251 252 return e; 253 } 254 255 int 256 sys_sched_yield(struct sched_yield_args *uap) 257 { 258 return ksched_yield(&uap->sysmsg_result, ksched); 259 } 260 261 int 262 sys_sched_get_priority_max(struct sched_get_priority_max_args *uap) 263 { 264 return ksched_get_priority_max(&uap->sysmsg_result, ksched, uap->policy); 265 } 266 267 int 268 sys_sched_get_priority_min(struct sched_get_priority_min_args *uap) 269 { 270 return ksched_get_priority_min(&uap->sysmsg_result, ksched, uap->policy); 271 } 272 273 int 274 sys_sched_rr_get_interval(struct sched_rr_get_interval_args *uap) 275 { 276 int e; 277 struct proc *p = curproc; 278 struct lwp *lp = curthread->td_lwp; 279 280 if ((e = p31b_proc(p, uap->pid, &p)) == 0) { 281 e = ksched_rr_get_interval(&uap->sysmsg_result, ksched, 282 lp, uap->interval); 283 } 284 return e; 285 } 286 287 #endif 288 289 static void p31binit(void *notused) 290 { 291 (void) sched_attach(); 292 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE); 293 } 294 295 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL); 296