NetBSD-5.0.2/sys/compat/svr4/svr4_signal.c
/* $NetBSD: svr4_signal.c,v 1.64 2008/04/28 20:23:45 martin Exp $ */
/*-
* Copyright (c) 1994, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas and by Charles M. Hannum.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: svr4_signal.c,v 1.64 2008/04/28 20:23:45 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/malloc.h>
#include <sys/wait.h>
#include <sys/syscallargs.h>
#include <uvm/uvm_extern.h>
#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_signal.h>
#include <compat/svr4/svr4_lwp.h>
#include <compat/svr4/svr4_ucontext.h>
#include <compat/svr4/svr4_syscallargs.h>
#include <compat/svr4/svr4_util.h>
#include <compat/common/compat_sigaltstack.h>
#define svr4_sigmask(n) (1 << (((n) - 1) & 31))
#define svr4_sigword(n) (((n) - 1) >> 5)
#define svr4_sigemptyset(s) memset((s), 0, sizeof(*(s)))
#define svr4_sigismember(s, n) ((s)->bits[svr4_sigword(n)] & svr4_sigmask(n))
#define svr4_sigaddset(s, n) ((s)->bits[svr4_sigword(n)] |= svr4_sigmask(n))
static inline void svr4_sigfillset(svr4_sigset_t *);
void svr4_to_native_sigaction(const struct svr4_sigaction *,
struct sigaction *);
void native_to_svr4_sigaction(const struct sigaction *,
struct svr4_sigaction *);
extern const int native_to_svr4_signo[];
extern const int svr4_to_native_signo[];
static inline void
svr4_sigfillset(svr4_sigset_t *s)
{
int i;
svr4_sigemptyset(s);
for (i = 1; i < SVR4_NSIG; i++)
if (svr4_to_native_signo[i] != 0)
svr4_sigaddset(s, i);
}
void
svr4_to_native_sigset(const svr4_sigset_t *sss, sigset_t *bss)
{
int i, newsig;
sigemptyset(bss);
for (i = 1; i < SVR4_NSIG; i++) {
if (svr4_sigismember(sss, i)) {
newsig = svr4_to_native_signo[i];
if (newsig)
sigaddset(bss, newsig);
}
}
}
void
native_to_svr4_sigset(const sigset_t *bss, svr4_sigset_t *sss)
{
int i, newsig;
svr4_sigemptyset(sss);
for (i = 1; i < NSIG; i++) {
if (sigismember(bss, i)) {
newsig = native_to_svr4_signo[i];
if (newsig)
svr4_sigaddset(sss, newsig);
}
}
}
/*
* XXX: Only a subset of the flags is currently implemented.
*/
void
svr4_to_native_sigaction(const struct svr4_sigaction *ssa, struct sigaction *bsa)
{
bsa->sa_handler = (sig_t) ssa->svr4_sa_handler;
svr4_to_native_sigset(&ssa->svr4_sa_mask, &bsa->sa_mask);
bsa->sa_flags = 0;
if ((ssa->svr4_sa_flags & SVR4_SA_ONSTACK) != 0)
bsa->sa_flags |= SA_ONSTACK;
if ((ssa->svr4_sa_flags & SVR4_SA_RESETHAND) != 0)
bsa->sa_flags |= SA_RESETHAND;
if ((ssa->svr4_sa_flags & SVR4_SA_RESTART) != 0)
bsa->sa_flags |= SA_RESTART;
if ((ssa->svr4_sa_flags & SVR4_SA_SIGINFO) != 0)
bsa->sa_flags |= SA_SIGINFO;
if ((ssa->svr4_sa_flags & SVR4_SA_NODEFER) != 0)
bsa->sa_flags |= SA_NODEFER;
if ((ssa->svr4_sa_flags & SVR4_SA_NOCLDWAIT) != 0)
bsa->sa_flags |= SA_NOCLDWAIT;
if ((ssa->svr4_sa_flags & SVR4_SA_NOCLDSTOP) != 0)
bsa->sa_flags |= SA_NOCLDSTOP;
if ((ssa->svr4_sa_flags & ~SVR4_SA_ALLBITS) != 0) {
DPRINTF(("svr4_to_native_sigaction: extra bits %x ignored\n",
ssa->svr4_sa_flags & ~SVR4_SA_ALLBITS));
}
}
void
native_to_svr4_sigaction(const struct sigaction *bsa, struct svr4_sigaction *ssa)
{
ssa->svr4_sa_handler = (svr4_sig_t) bsa->sa_handler;
native_to_svr4_sigset(&bsa->sa_mask, &ssa->svr4_sa_mask);
ssa->svr4_sa_flags = 0;
if ((bsa->sa_flags & SA_ONSTACK) != 0)
ssa->svr4_sa_flags |= SVR4_SA_ONSTACK;
if ((bsa->sa_flags & SA_RESETHAND) != 0)
ssa->svr4_sa_flags |= SVR4_SA_RESETHAND;
if ((bsa->sa_flags & SA_RESTART) != 0)
ssa->svr4_sa_flags |= SVR4_SA_RESTART;
if ((bsa->sa_flags & SA_NODEFER) != 0)
ssa->svr4_sa_flags |= SVR4_SA_NODEFER;
if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
ssa->svr4_sa_flags |= SVR4_SA_NOCLDSTOP;
}
int
svr4_sys_sigaction(struct lwp *l, const struct svr4_sys_sigaction_args *uap, register_t *retval)
{
/* {
syscallarg(int) signum;
syscallarg(const struct svr4_sigaction *) nsa;
syscallarg(struct svr4_sigaction *) osa;
} */
struct svr4_sigaction nssa, ossa;
struct sigaction nbsa, obsa;
int error;
if (SCARG(uap, nsa)) {
error = copyin(SCARG(uap, nsa), &nssa, sizeof(nssa));
if (error)
return (error);
svr4_to_native_sigaction(&nssa, &nbsa);
}
error = sigaction1(l, svr4_to_native_signo[SVR4_SIGNO(SCARG(uap, signum))],
SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0,
NULL, 0);
if (error)
return (error);
if (SCARG(uap, osa)) {
native_to_svr4_sigaction(&obsa, &ossa);
error = copyout(&ossa, SCARG(uap, osa), sizeof(ossa));
if (error)
return (error);
}
return (0);
}
int
svr4_sys_sigaltstack(struct lwp *l, const struct svr4_sys_sigaltstack_args *uap, register_t *retval)
{
/* {
syscallarg(const struct svr4_sigaltstack *) nss;
syscallarg(struct svr4_sigaltstack *) oss;
} */
compat_sigaltstack(uap, svr4_sigaltstack,
SVR4_SS_ONSTACK, SVR4_SS_DISABLE);
}
/*
* Stolen from the ibcs2 one
*/
int
svr4_sys_signal(struct lwp *l, const struct svr4_sys_signal_args *uap, register_t *retval)
{
/* {
syscallarg(int) signum;
syscallarg(svr4_sig_t) handler;
} */
int signum = svr4_to_native_signo[SVR4_SIGNO(SCARG(uap, signum))];
struct proc *p = l->l_proc;
struct sigaction nbsa, obsa;
sigset_t ss;
int error;
if (signum <= 0 || signum >= SVR4_NSIG)
return (EINVAL);
switch (SVR4_SIGCALL(SCARG(uap, signum))) {
case SVR4_SIGDEFER_MASK:
if (SCARG(uap, handler) == SVR4_SIG_HOLD)
goto sighold;
/* FALLTHROUGH */
case SVR4_SIGNAL_MASK:
nbsa.sa_handler = (sig_t)SCARG(uap, handler);
sigemptyset(&nbsa.sa_mask);
nbsa.sa_flags = 0;
error = sigaction1(l, signum, &nbsa, &obsa, NULL, 0);
if (error)
return (error);
*retval = (u_int)(u_long)obsa.sa_handler;
return (0);
case SVR4_SIGHOLD_MASK:
sighold:
sigemptyset(&ss);
sigaddset(&ss, signum);
mutex_enter(p->p_lock);
error = sigprocmask1(l, SIG_BLOCK, &ss, 0);
mutex_exit(p->p_lock);
return error;
case SVR4_SIGRELSE_MASK:
sigemptyset(&ss);
sigaddset(&ss, signum);
mutex_enter(p->p_lock);
error = sigprocmask1(l, SIG_UNBLOCK, &ss, 0);
mutex_exit(p->p_lock);
return error;
case SVR4_SIGIGNORE_MASK:
nbsa.sa_handler = SIG_IGN;
sigemptyset(&nbsa.sa_mask);
nbsa.sa_flags = 0;
return (sigaction1(l, signum, &nbsa, 0, NULL, 0));
case SVR4_SIGPAUSE_MASK:
ss = l->l_sigmask; /* XXXAD locking */
sigdelset(&ss, signum);
return (sigsuspend1(l, &ss));
default:
return (ENOSYS);
}
}
int
svr4_sys_sigprocmask(struct lwp *l, const struct svr4_sys_sigprocmask_args *uap, register_t *retval)
{
/* {
syscallarg(int) how;
syscallarg(const svr4_sigset_t *) set;
syscallarg(svr4_sigset_t *) oset;
} */
struct proc *p = l->l_proc;
svr4_sigset_t nsss, osss;
sigset_t nbss, obss;
int how;
int error;
/*
* Initialize how to 0 to avoid a compiler warning. Note that
* this is safe because of the check in the default: case.
*/
how = 0;
switch (SCARG(uap, how)) {
case SVR4_SIG_BLOCK:
how = SIG_BLOCK;
break;
case SVR4_SIG_UNBLOCK:
how = SIG_UNBLOCK;
break;
case SVR4_SIG_SETMASK:
how = SIG_SETMASK;
break;
default:
if (SCARG(uap, set))
return EINVAL;
break;
}
if (SCARG(uap, set)) {
error = copyin(SCARG(uap, set), &nsss, sizeof(nsss));
if (error)
return error;
svr4_to_native_sigset(&nsss, &nbss);
}
mutex_enter(p->p_lock);
error = sigprocmask1(l, how,
SCARG(uap, set) ? &nbss : NULL, SCARG(uap, oset) ? &obss : NULL);
mutex_exit(p->p_lock);
if (error)
return error;
if (SCARG(uap, oset)) {
native_to_svr4_sigset(&obss, &osss);
error = copyout(&osss, SCARG(uap, oset), sizeof(osss));
if (error)
return error;
}
return 0;
}
int
svr4_sys_sigpending(struct lwp *l, const struct svr4_sys_sigpending_args *uap, register_t *retval)
{
/* {
syscallarg(int) what;
syscallarg(svr4_sigset_t *) set;
} */
sigset_t bss;
svr4_sigset_t sss;
switch (SCARG(uap, what)) {
case 1: /* sigpending */
sigpending1(l, &bss);
native_to_svr4_sigset(&bss, &sss);
break;
case 2: /* sigfillset */
svr4_sigfillset(&sss);
break;
default:
return (EINVAL);
}
return (copyout(&sss, SCARG(uap, set), sizeof(sss)));
}
int
svr4_sys_sigsuspend(struct lwp *l, const struct svr4_sys_sigsuspend_args *uap, register_t *retval)
{
/* {
syscallarg(const svr4_sigset_t *) set;
} */
svr4_sigset_t sss;
sigset_t bss;
int error;
if (SCARG(uap, set)) {
error = copyin(SCARG(uap, set), &sss, sizeof(sss));
if (error)
return (error);
svr4_to_native_sigset(&sss, &bss);
}
return (sigsuspend1(l, SCARG(uap, set) ? &bss : 0));
}
int
svr4_sys_pause(struct lwp *l, const void *v, register_t *retval)
{
return (sigsuspend1(l, 0));
}
int
svr4_sys_kill(struct lwp *l, const struct svr4_sys_kill_args *uap, register_t *retval)
{
/* {
syscallarg(int) pid;
syscallarg(int) signum;
} */
struct sys_kill_args ka;
SCARG(&ka, pid) = SCARG(uap, pid);
SCARG(&ka, signum) = svr4_to_native_signo[SVR4_SIGNO(SCARG(uap, signum))];
return sys_kill(l, &ka, retval);
}
void
svr4_getcontext(struct lwp *l, struct svr4_ucontext *uc)
{
sigset_t mask;
struct proc *p = l->l_proc;
svr4_getmcontext(l, &uc->uc_mcontext, &uc->uc_flags);
uc->uc_link = l->l_ctxlink;
/*
* The (unsupplied) definition of the `current execution stack'
* in the System V Interface Definition appears to allow returning
* the main context stack.
*/
if ((l->l_sigstk.ss_flags & SS_ONSTACK) == 0) {
uc->uc_stack.ss_sp = (void *)USRSTACK;
uc->uc_stack.ss_size = ctob(p->p_vmspace->vm_ssize);
uc->uc_stack.ss_flags = 0; /* XXX, def. is Very Fishy */
} else {
/* Simply copy alternate signal execution stack. */
uc->uc_stack.ss_sp = l->l_sigstk.ss_sp;
uc->uc_stack.ss_size = l->l_sigstk.ss_size;
uc->uc_stack.ss_flags = l->l_sigstk.ss_flags;
}
(void)sigprocmask1(l, 0, NULL, &mask);
native_to_svr4_sigset(&mask, &uc->uc_sigmask);
uc->uc_flags |= _UC_SIGMASK | _UC_STACK;
}
int
svr4_setcontext(struct lwp *l, struct svr4_ucontext *uc)
{
struct proc *p = l->l_proc;
sigset_t mask;
if (uc->uc_flags & _UC_SIGMASK) {
svr4_to_native_sigset(&uc->uc_sigmask, &mask);
mutex_enter(p->p_lock);
sigprocmask1(l, SIG_SETMASK, &mask, NULL);
mutex_exit(p->p_lock);
}
/* Ignore the stack; see comment in svr4_getcontext. */
l->l_ctxlink = uc->uc_link;
svr4_setmcontext(l, &uc->uc_mcontext, uc->uc_flags);
return EJUSTRETURN;
}
int
svr4_sys_context(struct lwp *l, const struct svr4_sys_context_args *uap, register_t *retval)
{
/* {
syscallarg(int) func;
syscallarg(struct svr4_ucontext *) uc;
} */
int error;
svr4_ucontext_t uc;
*retval = 0;
switch (SCARG(uap, func)) {
case SVR4_GETCONTEXT:
DPRINTF(("getcontext(%p)\n", SCARG(uap, uc)));
svr4_getcontext(l, &uc);
return (copyout(&uc, SCARG(uap, uc), sizeof (*SCARG(uap, uc))));
case SVR4_SETCONTEXT:
DPRINTF(("setcontext(%p)\n", SCARG(uap, uc)));
error = copyin(SCARG(uap, uc), &uc, sizeof (uc));
if (error)
return (error);
svr4_setcontext(l, &uc);
return EJUSTRETURN;
default:
DPRINTF(("context(%d, %p)\n", SCARG(uap, func),
SCARG(uap, uc)));
return ENOSYS;
}
}