Initial import from FreeBSD RELENG_4:
[dragonfly.git] / sys / kern / kern_p1003_1b.c
CommitLineData
984263bc
MD
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 */
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
50MALLOC_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 */
85int 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 */
114int
115syscall_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
131static int sched_attach(void)
132{
133 return 0;
134}
135
136SYSCALL_NOT_PRESENT_GEN(sched_setparam)
137SYSCALL_NOT_PRESENT_GEN(sched_getparam)
138SYSCALL_NOT_PRESENT_GEN(sched_setscheduler)
139SYSCALL_NOT_PRESENT_GEN(sched_getscheduler)
140SYSCALL_NOT_PRESENT_GEN(sched_yield)
141SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max)
142SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min)
143SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval)
144
145#else
146
147/* Configured in kernel version:
148 */
149static struct ksched *ksched;
150
151static 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
161int 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
178int sched_getparam(struct proc *p,
179 struct sched_getparam_args *uap)
180{
181 struct proc *targetp;
182 struct sched_param sched_param;
183 int e;
184
185 if (uap->pid != 0 && uap->pid != p->p_pid) {
186 e = p31b_proc(p, uap->pid, &targetp);
187 if (e)
188 return e;
189 } else
190 targetp = p;
191
192 e = ksched_getparam(&p->p_retval[0], ksched, targetp, &sched_param);
193
194 if (!e)
195 copyout(&sched_param, uap->param, sizeof(sched_param));
196
197 return e;
198}
199int sched_setscheduler(struct proc *p,
200 struct sched_setscheduler_args *uap)
201{
202 int e;
203
204 struct sched_param sched_param;
205 copyin(uap->param, &sched_param, sizeof(sched_param));
206
207 (void) (0
208 || (e = p31b_proc(p, uap->pid, &p))
209 || (e = ksched_setscheduler(&p->p_retval[0],
210 ksched, p, uap->policy,
211 (const struct sched_param *)&sched_param))
212 );
213
214 return e;
215}
216int sched_getscheduler(struct proc *p,
217 struct sched_getscheduler_args *uap)
218{
219 struct proc *targetp;
220 int e;
221
222 if (uap->pid != 0 && uap->pid != p->p_pid) {
223 e = p31b_proc(p, uap->pid, &targetp);
224 if (e)
225 return e;
226 } else
227 targetp = p;
228
229 e = ksched_getscheduler(&p->p_retval[0], ksched, targetp);
230
231 return e;
232}
233int sched_yield(struct proc *p,
234 struct sched_yield_args *uap)
235{
236 return ksched_yield(&p->p_retval[0], ksched);
237}
238int sched_get_priority_max(struct proc *p,
239 struct sched_get_priority_max_args *uap)
240{
241 return ksched_get_priority_max(&p->p_retval[0],
242 ksched, uap->policy);
243}
244int sched_get_priority_min(struct proc *p,
245 struct sched_get_priority_min_args *uap)
246{
247 return ksched_get_priority_min(&p->p_retval[0],
248 ksched, uap->policy);
249}
250int sched_rr_get_interval(struct proc *p,
251 struct sched_rr_get_interval_args *uap)
252{
253 int e;
254
255 (void) (0
256 || (e = p31b_proc(p, uap->pid, &p))
257 || (e = ksched_rr_get_interval(&p->p_retval[0], ksched,
258 p, uap->interval))
259 );
260
261 return e;
262}
263
264#endif
265
266static void p31binit(void *notused)
267{
268 (void) sched_attach();
269 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
270}
271
272SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);