Annotation of src/sys/rump/librump/rumpkern/signals.c, Revision 1.5
1.5 ! pooka 1: /* $NetBSD: signals.c,v 1.4 2010/11/15 20:37:22 pooka Exp $ */
1.1 pooka 2:
3: /*
4: * Copyright (c) 2010 Antti Kantee. All Rights Reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16: * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18: * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25: * SUCH DAMAGE.
26: */
27:
28: #include <sys/cdefs.h>
1.5 ! pooka 29: __KERNEL_RCSID(0, "$NetBSD: signals.c,v 1.4 2010/11/15 20:37:22 pooka Exp $");
1.1 pooka 30:
31: #include <sys/param.h>
32: #include <sys/atomic.h>
33: #include <sys/event.h>
34: #include <sys/proc.h>
35: #include <sys/signal.h>
36:
37: #include <rump/rump.h>
38: #include <rump/rumpuser.h>
39:
40: #include "rumpkern_if_priv.h"
41:
1.5 ! pooka 42: const struct filterops sig_filtops = {
! 43: .f_attach = (void *)eopnotsupp,
! 44: };
! 45:
1.2 pooka 46: sigset_t sigcantmask;
1.1 pooka 47:
48: /* RUMP_SIGMODEL_PANIC */
49:
50: static void
51: rumpsig_panic(pid_t target, int signo)
52: {
53:
54: switch (signo) {
55: case SIGSYS:
56: break;
57: default:
58: panic("unhandled signal %d", signo);
59: }
60: }
61:
62: /* RUMP_SIGMODEL_IGNORE */
63:
64: static void
65: rumpsig_ignore(pid_t target, int signo)
66: {
67:
68: return;
69: }
70:
71: /* RUMP_SIGMODEL_HOST */
72:
73: static void
74: rumpsig_host(pid_t target, int signo)
75: {
76: int error;
77:
78: rumpuser_kill(target, signo, &error);
79: }
80:
81: /* RUMP_SIGMODEL_RAISE */
82:
83: static void
84: rumpsig_raise(pid_t target, int signo)
85: {
86: int error;
87:
88: rumpuser_kill(RUMPUSER_PID_SELF, signo, &error);
89: }
90:
1.4 pooka 91: static void
92: rumpsig_record(pid_t target, int sig)
93: {
94: struct proc *p = NULL;
95: struct pgrp *pgrp = NULL;
96:
97: /* well this is a little silly */
98: mutex_enter(proc_lock);
99: if (target >= 0)
100: p = proc_find_raw(target);
101: else
102: pgrp = pgrp_find(target);
103:
104: if (p) {
105: mutex_enter(p->p_lock);
106: if (!sigismember(&p->p_sigctx.ps_sigignore, sig)) {
107: sigaddset(&p->p_sigpend.sp_set, sig);
108: }
109: mutex_exit(p->p_lock);
110: } else if (pgrp) {
111: LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
112: mutex_enter(p->p_lock);
113: if (!sigismember(&p->p_sigctx.ps_sigignore, sig)) {
114: sigaddset(&p->p_sigpend.sp_set, sig);
115: }
116: mutex_exit(p->p_lock);
117: }
118: }
119: mutex_exit(proc_lock);
120: }
121:
1.1 pooka 122: typedef void (*rumpsig_fn)(pid_t pid, int sig);
123:
124: rumpsig_fn rumpsig = rumpsig_panic;
125:
126: /*
127: * Set signal delivery model. It would be nice if we could
128: * take a functional argument. But then we'd need some
129: * OS independent way to represent a signal number and also
130: * a method for easy processing (parsing is boring).
131: *
132: * Plus, upcalls from the rump kernel into process space except
133: * via rumpuser is a somewhat gray area now.
134: */
135: void
136: rump_boot_setsigmodel(enum rump_sigmodel model)
137: {
138:
139: switch (model) {
140: case RUMP_SIGMODEL_PANIC:
1.4 pooka 141: rumpsig = rumpsig_panic;
1.1 pooka 142: break;
143: case RUMP_SIGMODEL_IGNORE:
1.4 pooka 144: rumpsig = rumpsig_ignore;
1.1 pooka 145: break;
146: case RUMP_SIGMODEL_HOST:
1.4 pooka 147: rumpsig = rumpsig_host;
1.1 pooka 148: break;
149: case RUMP_SIGMODEL_RAISE:
1.4 pooka 150: rumpsig = rumpsig_raise;
151: break;
152: case RUMP_SIGMODEL_RECORD:
153: rumpsig = rumpsig_record;
1.1 pooka 154: break;
155: }
156: }
157:
158: void
159: psignal(struct proc *p, int sig)
160: {
161:
162: rumpsig(p->p_pid, sig);
163: }
164:
165: void
166: pgsignal(struct pgrp *pgrp, int sig, int checktty)
167: {
168:
169: rumpsig(-pgrp->pg_id, sig);
170: }
171:
172: void
173: kpsignal(struct proc *p, ksiginfo_t *ksi, void *data)
174: {
175:
176: rumpsig(p->p_pid, ksi->ksi_signo);
177: }
178:
179: void
180: kpgsignal(struct pgrp *pgrp, ksiginfo_t *ksi, void *data, int checkctty)
181: {
182:
183: rumpsig(-pgrp->pg_id, ksi->ksi_signo);
184: }
185:
186: int
187: sigispending(struct lwp *l, int signo)
188: {
1.4 pooka 189: struct proc *p = l->l_proc;
190: sigset_t tset;
191:
192: tset = p->p_sigpend.sp_set;
1.1 pooka 193:
1.4 pooka 194: if (signo == 0) {
195: if (firstsig(&tset) != 0)
196: return EINTR;
197: } else if (sigismember(&tset, signo))
198: return EINTR;
1.1 pooka 199: return 0;
200: }
201:
202: void
203: sigpending1(struct lwp *l, sigset_t *ss)
204: {
1.4 pooka 205: struct proc *p = l->l_proc;
1.1 pooka 206:
1.4 pooka 207: mutex_enter(p->p_lock);
208: *ss = l->l_proc->p_sigpend.sp_set;
209: mutex_exit(p->p_lock);
1.1 pooka 210: }
211:
212: int
213: sigismasked(struct lwp *l, int sig)
214: {
215:
1.4 pooka 216: return sigismember(&l->l_proc->p_sigctx.ps_sigignore, sig);
217: }
218:
219: void
220: sigclear(sigpend_t *sp, const sigset_t *mask, ksiginfoq_t *kq)
221: {
222:
223: if (mask == NULL)
224: sigemptyset(&sp->sp_set);
225: else
226: sigminusset(mask, &sp->sp_set);
1.1 pooka 227: }
228:
229: void
230: sigclearall(struct proc *p, const sigset_t *mask, ksiginfoq_t *kq)
231: {
232:
1.4 pooka 233: /* don't assert proc lock, hence callable from user context */
234: sigclear(&p->p_sigpend, mask, kq);
1.1 pooka 235: }
236:
237: void
238: ksiginfo_queue_drain0(ksiginfoq_t *kq)
239: {
240:
241: if (!(CIRCLEQ_EMPTY(kq)))
242: panic("how did that get there?");
243: }
1.3 pooka 244:
1.4 pooka 245: int
246: sigprocmask1(struct lwp *l, int how, const sigset_t *nss, sigset_t *oss)
247: {
248: sigset_t *mask = &l->l_proc->p_sigctx.ps_sigignore;
249:
250: KASSERT(mutex_owned(l->l_proc->p_lock));
251:
252: if (oss)
253: *oss = *mask;
254:
255: if (nss) {
256: switch (how) {
257: case SIG_BLOCK:
258: sigplusset(nss, mask);
259: break;
260: case SIG_UNBLOCK:
261: sigminusset(nss, mask);
262: break;
263: case SIG_SETMASK:
264: *mask = *nss;
265: break;
266: default:
267: return EINVAL;
268: }
269: }
270:
271: return 0;
272: }
273:
1.3 pooka 274: void
275: siginit(struct proc *p)
276: {
277:
1.4 pooka 278: sigemptyset(&p->p_sigctx.ps_sigignore);
279: sigemptyset(&p->p_sigpend.sp_set);
1.3 pooka 280: }
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