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