freebsd-dev/sys/compat/linux/linux_signal.c
Marcel Moolenaar 06ebbe77ed Implementation of linux_rt_sigaction and linux_rt_sigprocmask syscalls. Both
functions use the new sigset_t and sigaction_t which allows support for more
than 32 signals. Only the lower 32 signals are supported for now.

linux_rt_sigaction, linux_sigaction and linux_signal use linux_do_sigaction
to do the actual work. That way unnecessary redundancy is avoided. The same
has been done for linux_rt_sigprocmask and linux_sigprocmask. They call
linux_do_sigprocmask to do the actual work.
1999-08-14 17:28:46 +00:00

467 lines
12 KiB
C

/*-
* Copyright (c) 1994-1995 Søren Schmidt
* All rights reserved.
*
* 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
* in this position and unchanged.
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $Id: linux_signal.c,v 1.16 1999/07/06 06:54:00 cracauer Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/proc.h>
#include <sys/signalvar.h>
#include <i386/linux/linux.h>
#include <i386/linux/linux_proto.h>
#include <i386/linux/linux_util.h>
static sigset_t
linux_to_bsd_sigset(linux_sigset_t mask) {
int b, l;
sigset_t new = 0;
for (l = 1; l < LINUX_NSIG; l++) {
if (mask & (1 << (l - 1))) {
if ((b = linux_to_bsd_signal[l]))
new |= (1 << (b - 1));
}
}
return new;
}
static linux_sigset_t
bsd_to_linux_sigset(sigset_t mask) {
int b, l;
sigset_t new = 0;
for (b = 1; b < NSIG; b++) {
if (mask & (1 << (b - 1))) {
if ((l = bsd_to_linux_signal[b]))
new |= (1 << (l - 1));
}
}
return new;
}
static void
linux_to_bsd_sigaction(linux_sigaction_t *lsa, struct sigaction *bsa)
{
bsa->sa_mask = linux_to_bsd_sigset(lsa->lsa_mask);
bsa->sa_handler = lsa->lsa_handler;
bsa->sa_flags = 0;
if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP)
bsa->sa_flags |= SA_NOCLDSTOP;
if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT)
bsa->sa_flags |= SA_NOCLDWAIT;
if (lsa->lsa_flags & LINUX_SA_SIGINFO)
bsa->sa_flags |= SA_SIGINFO;
if (lsa->lsa_flags & LINUX_SA_ONSTACK)
bsa->sa_flags |= SA_ONSTACK;
if (lsa->lsa_flags & LINUX_SA_RESTART)
bsa->sa_flags |= SA_RESTART;
if (lsa->lsa_flags & LINUX_SA_ONESHOT)
bsa->sa_flags |= SA_RESETHAND;
if (lsa->lsa_flags & LINUX_SA_NOMASK)
bsa->sa_flags |= SA_NODEFER;
}
static void
bsd_to_linux_sigaction(struct sigaction *bsa, linux_sigaction_t *lsa)
{
lsa->lsa_handler = bsa->sa_handler;
lsa->lsa_restorer = NULL; /* unsupported */
lsa->lsa_mask = bsd_to_linux_sigset(bsa->sa_mask);
lsa->lsa_flags = 0;
if (bsa->sa_flags & SA_NOCLDSTOP)
lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
if (bsa->sa_flags & SA_NOCLDWAIT)
lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
if (bsa->sa_flags & SA_SIGINFO)
lsa->lsa_flags |= LINUX_SA_SIGINFO;
if (bsa->sa_flags & SA_ONSTACK)
lsa->lsa_flags |= LINUX_SA_ONSTACK;
if (bsa->sa_flags & SA_RESTART)
lsa->lsa_flags |= LINUX_SA_RESTART;
if (bsa->sa_flags & SA_RESETHAND)
lsa->lsa_flags |= LINUX_SA_ONESHOT;
if (bsa->sa_flags & SA_NODEFER)
lsa->lsa_flags |= LINUX_SA_NOMASK;
}
static int
linux_do_sigaction(struct proc *p, int linux_sig, linux_sigaction_t *linux_nsa,
linux_sigaction_t *linux_osa)
{
struct sigaction *nsa, *osa, sa;
struct sigaction_args sa_args;
int error;
caddr_t sg = stackgap_init();
if (linux_sig <= 0 || linux_sig >= LINUX_NSIG)
return EINVAL;
if (linux_osa)
osa = stackgap_alloc(&sg, sizeof(struct sigaction));
else
osa = NULL;
if (linux_nsa) {
nsa = stackgap_alloc(&sg, sizeof(struct sigaction));
linux_to_bsd_sigaction(linux_nsa, &sa);
error = copyout(&sa, nsa, sizeof(struct sigaction));
if (error)
return error;
}
else
nsa = NULL;
sa_args.signum = linux_to_bsd_signal[linux_sig];
sa_args.nsa = nsa;
sa_args.osa = osa;
error = sigaction(p, &sa_args);
if (error)
return error;
if (linux_osa) {
error = copyin(osa, &sa, sizeof(struct sigaction));
if (error)
return error;
bsd_to_linux_sigaction(&sa, linux_osa);
}
return 0;
}
int
linux_sigaction(struct proc *p, struct linux_sigaction_args *args)
{
linux_sigaction_t nsa, osa;
int error;
#ifdef DEBUG
printf("Linux-emul(%ld): sigaction(%d, %p, %p)\n",
(long)p->p_pid, args->sig, (void *)args->nsa, (void *)args->osa);
#endif
if (args->nsa) {
error = copyin(args->nsa, &nsa, sizeof(linux_sigaction_t));
if (error)
return error;
}
error = linux_do_sigaction(p, args->sig,
args->nsa ? &nsa : NULL,
args->osa ? &osa : NULL);
if (error)
return error;
if (args->osa) {
error = copyout(&osa, args->osa, sizeof(linux_sigaction_t));
if (error)
return error;
}
return 0;
}
int
linux_signal(struct proc *p, struct linux_signal_args *args)
{
linux_sigaction_t nsa, osa;
int error;
#ifdef DEBUG
printf("Linux-emul(%ld): signal(%d, %p)\n",
(long)p->p_pid, args->sig, (void *)args->handler);
#endif
nsa.lsa_handler = args->handler;
nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
nsa.lsa_mask = NULL;
error = linux_do_sigaction(p, args->sig, &nsa, &osa);
p->p_retval[0] = (int)osa.lsa_handler;
return 0;
}
int
linux_rt_sigaction(struct proc *p, struct linux_rt_sigaction_args *args)
{
linux_sigaction_t nsa, osa;
linux_new_sigaction_t new_sa;
int error;
#ifdef DEBUG
printf("Linux-emul(%ld): rt_sigaction(%d, %p, %p, %d)\n",
(long)p->p_pid, args->sig, (void *)args->act,
(void *)args->oact, args->sigsetsize);
#endif
if (args->sigsetsize != sizeof(linux_new_sigset_t))
return EINVAL;
#ifdef DEBUG
if (args->sig >= LINUX_NSIG) {
printf("LINUX(%ld): rt_sigaction: 64-bit signal (%d)\n",
(long)p->p_pid, args->sig);
}
#endif
if (args->act) {
error = copyin(args->act, &new_sa, sizeof(linux_new_sigaction_t));
if (error)
return error;
nsa.lsa_handler = new_sa.lsa_handler;
nsa.lsa_mask = new_sa.lsa_mask.sig[0];
nsa.lsa_flags = new_sa.lsa_flags;
nsa.lsa_restorer = new_sa.lsa_restorer;
#ifdef DEBUG
if (new_sa.lsa_mask.sig[1] != 0)
printf("LINUX(%ld): rt_sigaction: sig[1] = 0x%08lx\n",
(long)p->p_pid, new_sa.lsa_mask.sig[1]);
#endif
}
error = linux_do_sigaction(p, args->sig,
args->act ? &nsa : NULL,
args->oact ? &osa : NULL);
if (error)
return error;
if (args->oact) {
new_sa.lsa_handler = osa.lsa_handler;
new_sa.lsa_flags = osa.lsa_flags;
new_sa.lsa_restorer = osa.lsa_restorer;
new_sa.lsa_mask.sig[0] = osa.lsa_mask;
new_sa.lsa_mask.sig[1] = 0;
error = copyout(&osa, args->oact, sizeof(linux_new_sigaction_t));
if (error)
return error;
}
return 0;
}
static int
linux_do_sigprocmask(struct proc *p, int how, linux_sigset_t *new,
linux_sigset_t *old)
{
int error = 0, s;
sigset_t mask;
p->p_retval[0] = 0;
if (old != NULL)
*old = bsd_to_linux_sigset(p->p_sigmask);
if (new != NULL) {
mask = linux_to_bsd_sigset(*new);
s = splhigh();
switch (how) {
case LINUX_SIG_BLOCK:
p->p_sigmask |= (mask & ~sigcantmask);
break;
case LINUX_SIG_UNBLOCK:
p->p_sigmask &= ~mask;
break;
case LINUX_SIG_SETMASK:
p->p_sigmask = (mask & ~sigcantmask);
break;
default:
error = EINVAL;
break;
}
splx(s);
}
return error;
}
int
linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args)
{
linux_sigset_t mask;
linux_sigset_t omask;
int error;
#ifdef DEBUG
printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how);
#endif
if (args->mask != NULL) {
error = copyin(args->mask, &mask, sizeof(linux_sigset_t));
if (error)
return error;
}
error = linux_do_sigprocmask(p, args->how,
args->mask ? &mask : NULL,
args->omask ? &omask : NULL);
if (!error && args->omask != NULL) {
error = copyout(&omask, args->omask, sizeof(linux_sigset_t));
}
return error;
}
int
linux_rt_sigprocmask(struct proc *p, struct linux_rt_sigprocmask_args *args)
{
linux_new_sigset_t new_mask;
linux_sigset_t old_mask;
int error;
#ifdef DEBUG
printf("Linux-emul(%ld): rt_sigprocmask(%d, %p, %p, %d)\n",
(long)p->p_pid, args->how, (void *)args->mask,
(void *)args->omask, args->sigsetsize);
#endif
if (args->sigsetsize != sizeof(linux_new_sigset_t))
return EINVAL;
if (args->mask != NULL) {
error = copyin(args->mask, &new_mask, sizeof(linux_new_sigset_t));
if (error)
return error;
#ifdef DEBUG
if (new_mask.sig[1] != 0)
printf("LINUX(%ld): rt_sigprocmask: sig[1] = 0x%08lx\n",
(long)p->p_pid, new_mask.sig[1]);
#endif
}
error = linux_do_sigprocmask(p, args->how,
args->mask ? new_mask.sig : NULL,
args->omask ? &old_mask : NULL);
if (!error && args->omask != NULL) {
new_mask.sig[0] = old_mask;
error = copyout(&new_mask, args->omask, sizeof(linux_new_sigset_t));
}
return error;
}
int
linux_siggetmask(struct proc *p, struct linux_siggetmask_args *args)
{
#ifdef DEBUG
printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
#endif
p->p_retval[0] = bsd_to_linux_sigset(p->p_sigmask);
return 0;
}
int
linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args)
{
int s;
sigset_t mask;
#ifdef DEBUG
printf("Linux-emul(%ld): sigsetmask(%08lx)\n",
(long)p->p_pid, (unsigned long)args->mask);
#endif
p->p_retval[0] = bsd_to_linux_sigset(p->p_sigmask);
mask = linux_to_bsd_sigset(args->mask);
s = splhigh();
p->p_sigmask = mask & ~sigcantmask;
splx(s);
return 0;
}
int
linux_sigpending(struct proc *p, struct linux_sigpending_args *args)
{
linux_sigset_t linux_sig;
#ifdef DEBUG
printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
#endif
linux_sig = bsd_to_linux_sigset(p->p_siglist & p->p_sigmask);
return copyout(&linux_sig, args->mask, sizeof(linux_sig));
}
/*
* Linux has two extra args, restart and oldmask. We dont use these,
* but it seems that "restart" is actually a context pointer that
* enables the signal to happen with a different register set.
*/
int
linux_sigsuspend(struct proc *p, struct linux_sigsuspend_args *args)
{
struct sigsuspend_args tmp;
#ifdef DEBUG
printf("Linux-emul(%ld): sigsuspend(%08lx)\n",
(long)p->p_pid, (unsigned long)args->mask);
#endif
tmp.mask = linux_to_bsd_sigset(args->mask);
return sigsuspend(p, &tmp);
}
int
linux_pause(struct proc *p, struct linux_pause_args *args)
{
struct sigsuspend_args tmp;
#ifdef DEBUG
printf("Linux-emul(%d): pause()\n", p->p_pid);
#endif
tmp.mask = p->p_sigmask;
return sigsuspend(p, &tmp);
}
int
linux_kill(struct proc *p, struct linux_kill_args *args)
{
struct kill_args /* {
int pid;
int signum;
} */ tmp;
#ifdef DEBUG
printf("Linux-emul(%d): kill(%d, %d)\n",
p->p_pid, args->pid, args->signum);
#endif
if (args->signum < 0 || args->signum >= LINUX_NSIG)
return EINVAL;
tmp.pid = args->pid;
tmp.signum = linux_to_bsd_signal[args->signum];
return kill(p, &tmp);
}