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signals.c revision 1.1 
      1 /*	$NetBSD: signals.c,v 1.1 2010/04/21 11:38:05 pooka Exp $	*/
      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>
     29 __KERNEL_RCSID(0, "$NetBSD: signals.c,v 1.1 2010/04/21 11:38:05 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 "rumpkern_if_priv.h"
     41 
     42 const struct filterops sig_filtops;
     43 
     44 /* RUMP_SIGMODEL_PANIC */
     45 
     46 static void
     47 rumpsig_panic(pid_t target, int signo)
     48 {
     49 
     50 	switch (signo) {
     51 	case SIGSYS:
     52 		break;
     53 	default:
     54 		panic("unhandled signal %d", signo);
     55 	}
     56 }
     57 
     58 /* RUMP_SIGMODEL_IGNORE */
     59 
     60 static void
     61 rumpsig_ignore(pid_t target, int signo)
     62 {
     63 
     64 	return;
     65 }
     66 
     67 /* RUMP_SIGMODEL_HOST */
     68 
     69 static void
     70 rumpsig_host(pid_t target, int signo)
     71 {
     72 	int error;
     73 
     74 	rumpuser_kill(target, signo, &error);
     75 }
     76 
     77 /* RUMP_SIGMODEL_RAISE */
     78 
     79 static void
     80 rumpsig_raise(pid_t target, int signo)
     81 {
     82 	int error;
     83 
     84 	rumpuser_kill(RUMPUSER_PID_SELF, signo, &error);
     85 }
     86 
     87 typedef void (*rumpsig_fn)(pid_t pid, int sig);
     88 
     89 rumpsig_fn rumpsig = rumpsig_panic;
     90 
     91 /*
     92  * Set signal delivery model.  It would be nice if we could
     93  * take a functional argument.  But then we'd need some
     94  * OS independent way to represent a signal number and also
     95  * a method for easy processing (parsing is boring).
     96  *
     97  * Plus, upcalls from the rump kernel into process space except
     98  * via rumpuser is a somewhat gray area now.
     99  */
    100 void
    101 rump_boot_setsigmodel(enum rump_sigmodel model)
    102 {
    103 
    104 	switch (model) {
    105 	case RUMP_SIGMODEL_PANIC:
    106 		atomic_swap_ptr(&rumpsig, rumpsig_panic);
    107 		break;
    108 	case RUMP_SIGMODEL_IGNORE:
    109 		atomic_swap_ptr(&rumpsig, rumpsig_ignore);
    110 		break;
    111 	case RUMP_SIGMODEL_HOST:
    112 		atomic_swap_ptr(&rumpsig, rumpsig_host);
    113 		break;
    114 	case RUMP_SIGMODEL_RAISE:
    115 		atomic_swap_ptr(&rumpsig, rumpsig_raise);
    116 		break;
    117 	}
    118 }
    119 
    120 void
    121 psignal(struct proc *p, int sig)
    122 {
    123 
    124 	rumpsig(p->p_pid, sig);
    125 }
    126 
    127 void
    128 pgsignal(struct pgrp *pgrp, int sig, int checktty)
    129 {
    130 
    131 	rumpsig(-pgrp->pg_id, sig);
    132 }
    133 
    134 void
    135 kpsignal(struct proc *p, ksiginfo_t *ksi, void *data)
    136 {
    137 
    138 	rumpsig(p->p_pid, ksi->ksi_signo);
    139 }
    140 
    141 void
    142 kpgsignal(struct pgrp *pgrp, ksiginfo_t *ksi, void *data, int checkctty)
    143 {
    144 
    145 	rumpsig(-pgrp->pg_id, ksi->ksi_signo);
    146 }
    147 
    148 int
    149 sigispending(struct lwp *l, int signo)
    150 {
    151 
    152 	return 0;
    153 }
    154 
    155 void
    156 sigpending1(struct lwp *l, sigset_t *ss)
    157 {
    158 
    159 	sigemptyset(ss);
    160 }
    161 
    162 int
    163 sigismasked(struct lwp *l, int sig)
    164 {
    165 
    166 	return 0;
    167 }
    168 
    169 void
    170 sigclearall(struct proc *p, const sigset_t *mask, ksiginfoq_t *kq)
    171 {
    172 
    173 	/* nada */
    174 }
    175 
    176 void
    177 ksiginfo_queue_drain0(ksiginfoq_t *kq)
    178 {
    179 
    180 	if (!(CIRCLEQ_EMPTY(kq)))
    181 		panic("how did that get there?");
    182 }
    183