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