1 /* $NetBSD: signals.c,v 1.7 2011/01/14 13:11:08 pooka Exp $ */ 2 3 /*- 4 * Copyright (c) 2010, 2011 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> 29 __KERNEL_RCSID(0, "$NetBSD: signals.c,v 1.7 2011/01/14 13:11:08 pooka Exp $"); 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 "rump_private.h" 41 #include "rumpkern_if_priv.h" 42 43 const struct filterops sig_filtops = { 44 .f_attach = (void *)eopnotsupp, 45 }; 46 47 sigset_t sigcantmask; 48 49 static void 50 pgrp_apply(struct pgrp *pgrp, int signo, void (*apply)(struct proc *p, int)) 51 { 52 struct proc *p; 53 54 KASSERT(mutex_owned(proc_lock)); 55 56 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) { 57 mutex_enter(p->p_lock); 58 apply(p, signo); 59 mutex_exit(p->p_lock); 60 } 61 } 62 63 /* RUMP_SIGMODEL_PANIC */ 64 65 static void 66 rumpsig_panic(struct proc *p, int signo) 67 { 68 69 switch (signo) { 70 case SIGSYS: 71 case SIGPIPE: 72 break; 73 default: 74 panic("unhandled signal %d", signo); 75 } 76 } 77 78 /* RUMP_SIGMODEL_IGNORE */ 79 80 static void 81 rumpsig_ignore(struct proc *p, int signo) 82 { 83 84 return; 85 } 86 87 /* RUMP_SIGMODEL_HOST */ 88 89 static void 90 rumpsig_host(struct proc *p, int signo) 91 { 92 int error; 93 94 rumpuser_kill(p->p_pid, signo, &error); 95 } 96 97 /* RUMP_SIGMODEL_RAISE */ 98 99 static void 100 rumpsig_raise(struct proc *p, int signo) 101 { 102 int error = 0; 103 104 if (RUMP_LOCALPROC_P(p)) { 105 rumpuser_kill(RUMPUSER_PID_SELF, signo, &error); 106 } else { 107 rumpuser_sp_raise(p->p_vmspace->vm_map.pmap, signo); 108 } 109 } 110 111 static void 112 rumpsig_record(struct proc *p, int signo) 113 { 114 115 if (!sigismember(&p->p_sigctx.ps_sigignore, signo)) { 116 sigaddset(&p->p_sigpend.sp_set, signo); 117 } 118 } 119 120 typedef void (*rumpsig_fn)(struct proc *, int); 121 122 static rumpsig_fn rumpsig = rumpsig_panic; 123 124 /* 125 * Set signal delivery model. It would be nice if we could 126 * take a functional argument. But then we'd need some 127 * OS independent way to represent a signal number and also 128 * a method for easy processing (parsing is boring). 129 * 130 * Plus, upcalls from the rump kernel into process space except 131 * via rumpuser is a somewhat gray area now. 132 */ 133 void 134 rump_boot_setsigmodel(enum rump_sigmodel model) 135 { 136 137 switch (model) { 138 case RUMP_SIGMODEL_PANIC: 139 rumpsig = rumpsig_panic; 140 break; 141 case RUMP_SIGMODEL_IGNORE: 142 rumpsig = rumpsig_ignore; 143 break; 144 case RUMP_SIGMODEL_HOST: 145 rumpsig = rumpsig_host; 146 break; 147 case RUMP_SIGMODEL_RAISE: 148 rumpsig = rumpsig_raise; 149 break; 150 case RUMP_SIGMODEL_RECORD: 151 rumpsig = rumpsig_record; 152 break; 153 } 154 } 155 156 void 157 psignal(struct proc *p, int sig) 158 { 159 160 rumpsig(p, sig); 161 } 162 163 void 164 pgsignal(struct pgrp *pgrp, int sig, int checktty) 165 { 166 167 pgrp_apply(pgrp, sig, rumpsig); 168 } 169 170 void 171 kpsignal(struct proc *p, ksiginfo_t *ksi, void *data) 172 { 173 174 rumpsig(p, ksi->ksi_signo); 175 } 176 177 void 178 kpgsignal(struct pgrp *pgrp, ksiginfo_t *ksi, void *data, int checkctty) 179 { 180 181 pgrp_apply(pgrp, ksi->ksi_signo, rumpsig); 182 } 183 184 int 185 sigispending(struct lwp *l, int signo) 186 { 187 struct proc *p = l->l_proc; 188 sigset_t tset; 189 190 tset = p->p_sigpend.sp_set; 191 192 if (signo == 0) { 193 if (firstsig(&tset) != 0) 194 return EINTR; 195 } else if (sigismember(&tset, signo)) 196 return EINTR; 197 return 0; 198 } 199 200 void 201 sigpending1(struct lwp *l, sigset_t *ss) 202 { 203 struct proc *p = l->l_proc; 204 205 mutex_enter(p->p_lock); 206 *ss = l->l_proc->p_sigpend.sp_set; 207 mutex_exit(p->p_lock); 208 } 209 210 int 211 sigismasked(struct lwp *l, int sig) 212 { 213 214 return sigismember(&l->l_proc->p_sigctx.ps_sigignore, sig); 215 } 216 217 void 218 sigclear(sigpend_t *sp, const sigset_t *mask, ksiginfoq_t *kq) 219 { 220 221 if (mask == NULL) 222 sigemptyset(&sp->sp_set); 223 else 224 sigminusset(mask, &sp->sp_set); 225 } 226 227 void 228 sigclearall(struct proc *p, const sigset_t *mask, ksiginfoq_t *kq) 229 { 230 231 /* don't assert proc lock, hence callable from user context */ 232 sigclear(&p->p_sigpend, mask, kq); 233 } 234 235 void 236 ksiginfo_queue_drain0(ksiginfoq_t *kq) 237 { 238 239 if (!(CIRCLEQ_EMPTY(kq))) 240 panic("how did that get there?"); 241 } 242 243 int 244 sigprocmask1(struct lwp *l, int how, const sigset_t *nss, sigset_t *oss) 245 { 246 sigset_t *mask = &l->l_proc->p_sigctx.ps_sigignore; 247 248 KASSERT(mutex_owned(l->l_proc->p_lock)); 249 250 if (oss) 251 *oss = *mask; 252 253 if (nss) { 254 switch (how) { 255 case SIG_BLOCK: 256 sigplusset(nss, mask); 257 break; 258 case SIG_UNBLOCK: 259 sigminusset(nss, mask); 260 break; 261 case SIG_SETMASK: 262 *mask = *nss; 263 break; 264 default: 265 return EINVAL; 266 } 267 } 268 269 return 0; 270 } 271 272 void 273 siginit(struct proc *p) 274 { 275 276 sigemptyset(&p->p_sigctx.ps_sigignore); 277 sigemptyset(&p->p_sigpend.sp_set); 278 } 279