Annotation of sys/compat/linux/linux_sched.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: linux_sched.c,v 1.5 2004/11/23 19:08:52 miod Exp $ */
2: /* $NetBSD: linux_sched.c,v 1.6 2000/05/28 05:49:05 thorpej Exp $ */
3:
4: /*-
5: * Copyright (c) 1999 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
10: * NASA Ames Research Center; by Matthias Scheler.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. All advertising materials mentioning features or use of this software
21: * must display the following acknowledgement:
22: * This product includes software developed by the NetBSD
23: * Foundation, Inc. and its contributors.
24: * 4. Neither the name of The NetBSD Foundation nor the names of its
25: * contributors may be used to endorse or promote products derived
26: * from this software without specific prior written permission.
27: *
28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38: * POSSIBILITY OF SUCH DAMAGE.
39: */
40:
41: /*
42: * Linux compatibility module. Try to deal with scheduler related syscalls.
43: */
44:
45: #include <sys/types.h>
46: #include <sys/param.h>
47: #include <sys/mount.h>
48: #include <sys/proc.h>
49: #include <sys/systm.h>
50: #include <sys/syscallargs.h>
51:
52: #include <machine/cpu.h>
53:
54: #include <compat/linux/linux_types.h>
55: #include <compat/linux/linux_sched.h>
56: #include <compat/linux/linux_signal.h>
57: #include <compat/linux/linux_syscallargs.h>
58:
59: int
60: linux_sys_clone(p, v, retval)
61: struct proc *p;
62: void *v;
63: register_t *retval;
64: {
65: struct linux_sys_clone_args /* {
66: syscallarg(int) flags;
67: syscallarg(void *) stack;
68: } */ *uap = v;
69: int flags = FORK_RFORK, sig;
70:
71: /*
72: * We don't support the Linux CLONE_PID or CLONE_PTRACE flags.
73: */
74: if (SCARG(uap, flags) & (LINUX_CLONE_PID | LINUX_CLONE_PTRACE))
75: return (EINVAL);
76:
77: if (SCARG(uap, flags) & LINUX_CLONE_VM)
78: flags |= FORK_SHAREVM;
79: /* XXX We pretend to support CLONE_FS for the moment. */
80: if (SCARG(uap, flags) & LINUX_CLONE_FILES)
81: flags |= FORK_SHAREFILES;
82: if (SCARG(uap, flags) & LINUX_CLONE_SIGHAND)
83: flags |= FORK_SIGHAND;
84: if (SCARG(uap, flags) & LINUX_CLONE_VFORK) {
85: flags |= FORK_PPWAIT;
86: }
87:
88: sig = SCARG(uap, flags) & LINUX_CLONE_CSIGNAL;
89: if (sig < 0 || sig >= LINUX__NSIG)
90: return (EINVAL);
91: sig = linux_to_bsd_sig[sig];
92:
93: /*
94: * Note that Linux does not provide a portable way of specifying
95: * the stack area; the caller must know if the stack grows up
96: * or down. So, we pass a stack size of 0, so that the code
97: * that makes this adjustment is a noop.
98: */
99: return (fork1(p, sig, flags, SCARG(uap, stack), 0, NULL, NULL, retval,
100: NULL));
101: }
102:
103: int
104: linux_sys_sched_setparam(cp, v, retval)
105: struct proc *cp;
106: void *v;
107: register_t *retval;
108: {
109: struct linux_sys_sched_setparam_args /* {
110: syscallarg(linux_pid_t) pid;
111: syscallarg(const struct linux_sched_param *) sp;
112: } */ *uap = v;
113: int error;
114: struct linux_sched_param lp;
115: struct proc *p;
116:
117: /*
118: * We only check for valid parameters and return afterwards.
119: */
120:
121: if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL)
122: return (EINVAL);
123:
124: error = copyin(SCARG(uap, sp), &lp, sizeof(lp));
125: if (error)
126: return (error);
127:
128: if (SCARG(uap, pid) != 0) {
129: struct pcred *pc = cp->p_cred;
130:
131: if ((p = pfind(SCARG(uap, pid))) == NULL)
132: return (ESRCH);
133: if (!(cp == p ||
134: pc->pc_ucred->cr_uid == 0 ||
135: pc->p_ruid == p->p_cred->p_ruid ||
136: pc->pc_ucred->cr_uid == p->p_cred->p_ruid ||
137: pc->p_ruid == p->p_ucred->cr_uid ||
138: pc->pc_ucred->cr_uid == p->p_ucred->cr_uid))
139: return (EPERM);
140: }
141:
142: return (0);
143: }
144:
145: int
146: linux_sys_sched_getparam(cp, v, retval)
147: struct proc *cp;
148: void *v;
149: register_t *retval;
150: {
151: struct linux_sys_sched_getparam_args /* {
152: syscallarg(linux_pid_t) pid;
153: syscallarg(struct linux_sched_param *) sp;
154: } */ *uap = v;
155: struct proc *p;
156: struct linux_sched_param lp;
157:
158: /*
159: * We only check for valid parameters and return a dummy priority
160: * afterwards.
161: */
162: if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL)
163: return (EINVAL);
164:
165: if (SCARG(uap, pid) != 0) {
166: struct pcred *pc = cp->p_cred;
167:
168: if ((p = pfind(SCARG(uap, pid))) == NULL)
169: return (ESRCH);
170: if (!(cp == p ||
171: pc->pc_ucred->cr_uid == 0 ||
172: pc->p_ruid == p->p_cred->p_ruid ||
173: pc->pc_ucred->cr_uid == p->p_cred->p_ruid ||
174: pc->p_ruid == p->p_ucred->cr_uid ||
175: pc->pc_ucred->cr_uid == p->p_ucred->cr_uid))
176: return (EPERM);
177: }
178:
179: lp.sched_priority = 0;
180: return (copyout(&lp, SCARG(uap, sp), sizeof lp));
181: }
182:
183: int
184: linux_sys_sched_setscheduler(cp, v, retval)
185: struct proc *cp;
186: void *v;
187: register_t *retval;
188: {
189: struct linux_sys_sched_setscheduler_args /* {
190: syscallarg(linux_pid_t) pid;
191: syscallarg(int) policy;
192: syscallarg(cont struct linux_sched_scheduler *) sp;
193: } */ *uap = v;
194: int error;
195: struct linux_sched_param lp;
196: struct proc *p;
197:
198: /*
199: * We only check for valid parameters and return afterwards.
200: */
201:
202: if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL)
203: return (EINVAL);
204:
205: error = copyin(SCARG(uap, sp), &lp, sizeof(lp));
206: if (error)
207: return (error);
208:
209: if (SCARG(uap, pid) != 0) {
210: struct pcred *pc = cp->p_cred;
211:
212: if ((p = pfind(SCARG(uap, pid))) == NULL)
213: return (ESRCH);
214: if (!(cp == p ||
215: pc->pc_ucred->cr_uid == 0 ||
216: pc->p_ruid == p->p_cred->p_ruid ||
217: pc->pc_ucred->cr_uid == p->p_cred->p_ruid ||
218: pc->p_ruid == p->p_ucred->cr_uid ||
219: pc->pc_ucred->cr_uid == p->p_ucred->cr_uid))
220: return (EPERM);
221: }
222:
223: /*
224: * We can't emulate anything but the default scheduling policy.
225: */
226: if (SCARG(uap, policy) != LINUX_SCHED_OTHER || lp.sched_priority != 0)
227: return (EINVAL);
228:
229: return (0);
230: }
231:
232: int
233: linux_sys_sched_getscheduler(cp, v, retval)
234: struct proc *cp;
235: void *v;
236: register_t *retval;
237: {
238: struct linux_sys_sched_getscheduler_args /* {
239: syscallarg(linux_pid_t) pid;
240: } */ *uap = v;
241: struct proc *p;
242:
243: *retval = -1;
244:
245: /*
246: * We only check for valid parameters and return afterwards.
247: */
248:
249: if (SCARG(uap, pid) != 0) {
250: struct pcred *pc = cp->p_cred;
251:
252: if ((p = pfind(SCARG(uap, pid))) == NULL)
253: return (ESRCH);
254: if (!(cp == p ||
255: pc->pc_ucred->cr_uid == 0 ||
256: pc->p_ruid == p->p_cred->p_ruid ||
257: pc->pc_ucred->cr_uid == p->p_cred->p_ruid ||
258: pc->p_ruid == p->p_ucred->cr_uid ||
259: pc->pc_ucred->cr_uid == p->p_ucred->cr_uid))
260: return (EPERM);
261: }
262:
263: /*
264: * We can't emulate anything but the default scheduling policy.
265: */
266: *retval = LINUX_SCHED_OTHER;
267: return (0);
268: }
269:
270: int
271: linux_sys_sched_yield(cp, v, retval)
272: struct proc *cp;
273: void *v;
274: register_t *retval;
275: {
276: need_resched(curcpu());
277: return (0);
278: }
279:
280: int
281: linux_sys_sched_get_priority_max(cp, v, retval)
282: struct proc *cp;
283: void *v;
284: register_t *retval;
285: {
286: struct linux_sys_sched_get_priority_max_args /* {
287: syscallarg(int) policy;
288: } */ *uap = v;
289:
290: /*
291: * We can't emulate anything but the default scheduling policy.
292: */
293: if (SCARG(uap, policy) != LINUX_SCHED_OTHER) {
294: *retval = -1;
295: return (EINVAL);
296: }
297:
298: *retval = 0;
299: return (0);
300: }
301:
302: int
303: linux_sys_sched_get_priority_min(cp, v, retval)
304: struct proc *cp;
305: void *v;
306: register_t *retval;
307: {
308: struct linux_sys_sched_get_priority_min_args /* {
309: syscallarg(int) policy;
310: } */ *uap = v;
311:
312: /*
313: * We can't emulate anything but the default scheduling policy.
314: */
315: if (SCARG(uap, policy) != LINUX_SCHED_OTHER) {
316: *retval = -1;
317: return (EINVAL);
318: }
319:
320: *retval = 0;
321: return (0);
322: }
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