1 /* $NetBSD: signals.c,v 1.13 2014/02/20 00:41:05 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 1.13 2014/02/20 00:41:05 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_RAISE */ 88 89 static void 90 rumpsig_raise(struct proc *p, int signo) 91 { 92 93 if (RUMP_LOCALPROC_P(p)) { 94 rumpuser_kill(p->p_pid, signo); 95 } else { 96 rumpuser_sp_raise(p->p_vmspace->vm_map.pmap, signo); 97 } 98 } 99 100 static void 101 rumpsig_record(struct proc *p, int signo) 102 { 103 104 if (!sigismember(&p->p_sigctx.ps_sigignore, signo)) { 105 sigaddset(&p->p_sigpend.sp_set, signo); 106 } 107 } 108 109 typedef void (*rumpsig_fn)(struct proc *, int); 110 111 static rumpsig_fn rumpsig = rumpsig_raise; 112 113 /* 114 * Set signal delivery model. It would be nice if we could 115 * take a functional argument. But then we'd need some 116 * OS independent way to represent a signal number and also 117 * a method for easy processing (parsing is boring). 118 * 119 * Plus, upcalls from the rump kernel into process space except 120 * via rumpuser is a somewhat gray area now. 121 */ 122 void 123 rump_boot_setsigmodel(enum rump_sigmodel model) 124 { 125 126 switch (model) { 127 case RUMP_SIGMODEL_PANIC: 128 rumpsig = rumpsig_panic; 129 break; 130 case RUMP_SIGMODEL_IGNORE: 131 rumpsig = rumpsig_ignore; 132 break; 133 case RUMP_SIGMODEL_RAISE: 134 rumpsig = rumpsig_raise; 135 break; 136 case RUMP_SIGMODEL_RECORD: 137 rumpsig = rumpsig_record; 138 break; 139 140 /* for compat, though I doubt anyone is using it */ 141 case RUMP_SIGMODEL__HOST_NOTANYMORE: 142 rumpsig = rumpsig_raise; 143 break; 144 } 145 } 146 147 void 148 psignal(struct proc *p, int sig) 149 { 150 151 rumpsig(p, sig); 152 } 153 154 void 155 pgsignal(struct pgrp *pgrp, int sig, int checktty) 156 { 157 158 pgrp_apply(pgrp, sig, rumpsig); 159 } 160 161 void 162 kpsignal(struct proc *p, ksiginfo_t *ksi, void *data) 163 { 164 165 rumpsig(p, ksi->ksi_signo); 166 } 167 168 void 169 kpgsignal(struct pgrp *pgrp, ksiginfo_t *ksi, void *data, int checkctty) 170 { 171 172 pgrp_apply(pgrp, ksi->ksi_signo, rumpsig); 173 } 174 175 int 176 sigispending(struct lwp *l, int signo) 177 { 178 struct proc *p = l->l_proc; 179 sigset_t tset; 180 181 tset = p->p_sigpend.sp_set; 182 183 if (signo == 0) { 184 if (firstsig(&tset) != 0) 185 return EINTR; 186 } else if (sigismember(&tset, signo)) 187 return EINTR; 188 return 0; 189 } 190 191 void 192 sigpending1(struct lwp *l, sigset_t *ss) 193 { 194 struct proc *p = l->l_proc; 195 196 mutex_enter(p->p_lock); 197 *ss = l->l_proc->p_sigpend.sp_set; 198 mutex_exit(p->p_lock); 199 } 200 201 int 202 sigismasked(struct lwp *l, int sig) 203 { 204 205 return sigismember(&l->l_proc->p_sigctx.ps_sigignore, sig); 206 } 207 208 void 209 sigclear(sigpend_t *sp, const sigset_t *mask, ksiginfoq_t *kq) 210 { 211 212 if (mask == NULL) 213 sigemptyset(&sp->sp_set); 214 else 215 sigminusset(mask, &sp->sp_set); 216 } 217 218 void 219 sigclearall(struct proc *p, const sigset_t *mask, ksiginfoq_t *kq) 220 { 221 222 /* don't assert proc lock, hence callable from user context */ 223 sigclear(&p->p_sigpend, mask, kq); 224 } 225 226 void 227 ksiginfo_queue_drain0(ksiginfoq_t *kq) 228 { 229 230 if (!(TAILQ_EMPTY(kq))) 231 panic("how did that get there?"); 232 } 233 234 int 235 sigprocmask1(struct lwp *l, int how, const sigset_t *nss, sigset_t *oss) 236 { 237 sigset_t *mask = &l->l_proc->p_sigctx.ps_sigignore; 238 239 KASSERT(mutex_owned(l->l_proc->p_lock)); 240 241 if (oss) 242 *oss = *mask; 243 244 if (nss) { 245 switch (how) { 246 case SIG_BLOCK: 247 sigplusset(nss, mask); 248 break; 249 case SIG_UNBLOCK: 250 sigminusset(nss, mask); 251 break; 252 case SIG_SETMASK: 253 *mask = *nss; 254 break; 255 default: 256 return EINVAL; 257 } 258 } 259 260 return 0; 261 } 262 263 void 264 siginit(struct proc *p) 265 { 266 267 sigemptyset(&p->p_sigctx.ps_sigignore); 268 sigemptyset(&p->p_sigpend.sp_set); 269 } 270 271 void 272 sigsuspendsetup(struct lwp *l, const sigset_t *ss) 273 { 274 /* XXX: Partial copy of kernel code, remove and use the kernel code. */ 275 struct proc *p = l->l_proc; 276 277 mutex_enter(p->p_lock); 278 l->l_sigrestore = 1; 279 l->l_sigoldmask = l->l_sigmask; 280 l->l_sigmask = *ss; 281 sigminusset(&sigcantmask, &l->l_sigmask); 282 mutex_exit(p->p_lock); 283 } 284 285 void 286 sigsuspendteardown(struct lwp *l) 287 { 288 /* XXX: Copy of kernel code, remove and use the kernel code. */ 289 struct proc *p = l->l_proc; 290 291 mutex_enter(p->p_lock); 292 if (l->l_sigrestore) { 293 l->l_sigrestore = 0; 294 l->l_sigmask = l->l_sigoldmask; 295 } 296 mutex_exit(p->p_lock); 297 } 298