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NetBSD/sys/compat/linux/linux_signal.c

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/* $NetBSD: linux_signal.c,v 1.3 1995/03/10 22:55:04 fvdl Exp $ */
/*
* Copyright (c) 1995 Frank van der Linden
* 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.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project
* by Frank van der Linden
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without 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.
*
* heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos 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/syscallargs.h>
#include <compat/linux/linux_types.h>
#include <compat/linux/linux_syscallargs.h>
#include <compat/linux/linux_util.h>
#include <compat/linux/linux_signal.h>
/*
* Most of ths stuff in this file is taken from Christos' SVR4 emul
* code. The things that need to be done are largely the same, so
* re-inventing the wheel doesn't make much sense.
*/
/*
* Some boring signal conversion functions. Just a switch() for all signals;
* return the converted signal number, 0 if not supported.
*/
int
bsd_to_linux_sig(sig)
int sig;
{
switch(sig) {
case SIGHUP:
return LINUX_SIGHUP;
case SIGINT:
return LINUX_SIGINT;
case SIGQUIT:
return LINUX_SIGQUIT;
case SIGILL:
return LINUX_SIGILL;
case SIGTRAP:
return LINUX_SIGTRAP;
case SIGABRT:
return LINUX_SIGABRT;
case SIGFPE:
return LINUX_SIGFPE;
case SIGKILL:
return LINUX_SIGKILL;
case SIGBUS:
return LINUX_SIGBUS;
case SIGSEGV:
return LINUX_SIGSEGV;
case SIGPIPE:
return LINUX_SIGPIPE;
case SIGALRM:
return LINUX_SIGALRM;
case SIGTERM:
return LINUX_SIGTERM;
case SIGURG:
return LINUX_SIGURG;
case SIGSTOP:
return LINUX_SIGSTOP;
case SIGTSTP:
return LINUX_SIGTSTP;
case SIGCONT:
return LINUX_SIGCONT;
case SIGCHLD:
return LINUX_SIGCHLD;
case SIGTTIN:
return LINUX_SIGTTIN;
case SIGTTOU:
return LINUX_SIGTTOU;
case SIGIO:
return LINUX_SIGIO;
case SIGXCPU:
return LINUX_SIGXCPU;
case SIGXFSZ:
return LINUX_SIGXFSZ;
case SIGVTALRM:
return LINUX_SIGVTALRM;
case SIGPROF:
return LINUX_SIGPROF;
case SIGWINCH:
return LINUX_SIGWINCH;
case SIGUSR1:
return LINUX_SIGUSR1;
case SIGUSR2:
return LINUX_SIGUSR2;
/* Not supported: EMT, SYS, INFO */
}
return 0;
}
int
linux_to_bsd_sig(sig)
int sig;
{
switch(sig) {
case LINUX_SIGHUP:
return SIGHUP;
case LINUX_SIGINT:
return SIGINT;
case LINUX_SIGQUIT:
return SIGQUIT;
case LINUX_SIGILL:
return SIGILL;
case LINUX_SIGTRAP:
return SIGTRAP;
case LINUX_SIGABRT:
return SIGABRT;
case LINUX_SIGBUS:
return SIGBUS;
case LINUX_SIGFPE:
return SIGFPE;
case LINUX_SIGKILL:
return SIGKILL;
case LINUX_SIGUSR1:
return SIGUSR1;
case LINUX_SIGSEGV:
return SIGSEGV;
case LINUX_SIGUSR2:
return SIGUSR2;
case LINUX_SIGPIPE:
return SIGPIPE;
case LINUX_SIGALRM:
return SIGALRM;
case LINUX_SIGTERM:
return SIGTERM;
case LINUX_SIGCHLD:
return SIGCHLD;
case LINUX_SIGCONT:
return SIGCONT;
case LINUX_SIGSTOP:
return SIGSTOP;
case LINUX_SIGTSTP:
return SIGTSTP;
case LINUX_SIGTTIN:
return SIGTTIN;
case LINUX_SIGTTOU:
return SIGTTOU;
case LINUX_SIGURG:
return SIGURG;
case LINUX_SIGXCPU:
return SIGXCPU;
case LINUX_SIGXFSZ:
return SIGXFSZ;
case LINUX_SIGVTALRM:
return SIGVTALRM;
case LINUX_SIGPROF:
return SIGPROF;
case LINUX_SIGWINCH:
return SIGWINCH;
case LINUX_SIGIO:
return SIGIO;
/* Not supported: STKFLT, PWR */
}
return 0;
}
/*
* Ok, we know that Linux and BSD signals both are just an unsigned int.
* Don't bother to use the sigismember() stuff for now.
*/
static void
linux_to_bsd_sigset(lss, bss)
const linux_sigset_t *lss;
sigset_t *bss;
{
int i, newsig;
*bss = (sigset_t) 0;
for (i = 1; i <= LINUX_NSIG; i++) {
if (*lss & sigmask(i)) {
newsig = linux_to_bsd_sig(i);
if (newsig)
*bss |= sigmask(newsig);
}
}
}
void
bsd_to_linux_sigset(bss, lss)
const sigset_t *bss;
linux_sigset_t *lss;
{
int i, newsig;
*lss = (linux_sigset_t) 0;
for (i = 1; i <= NSIG; i++) {
if (*bss & sigmask(i)) {
newsig = bsd_to_linux_sig(i);
if (newsig)
*lss |= sigmask(newsig);
}
}
}
/*
* Convert between Linux and BSD sigaction structures. Linux has
* one extra field (sa_restorer) which we don't support. The Linux
* SA_ONESHOT and SA_NOMASK flags (which together form the old
* SysV signal behavior) are silently ignored. XXX
*/
void
linux_to_bsd_sigaction(lsa, bsa)
struct linux_sigaction *lsa;
struct sigaction *bsa;
{
bsa->sa_handler = lsa->sa_handler;
linux_to_bsd_sigset(&bsa->sa_mask, &lsa->sa_mask);
bsa->sa_flags = 0;
bsa->sa_flags |= cvtto_bsd_mask(lsa->sa_flags, LINUX_SA_NOCLDSTOP,
SA_NOCLDSTOP);
bsa->sa_flags |= cvtto_bsd_mask(lsa->sa_flags, LINUX_SA_ONSTACK,
SA_ONSTACK);
bsa->sa_flags |= cvtto_bsd_mask(lsa->sa_flags, LINUX_SA_RESTART,
SA_RESTART);
}
void
bsd_to_linux_sigaction(bsa, lsa)
struct sigaction *bsa;
struct linux_sigaction *lsa;
{
lsa->sa_handler = bsa->sa_handler;
bsd_to_linux_sigset(&lsa->sa_mask, &bsa->sa_mask);
lsa->sa_flags = 0;
lsa->sa_flags |= cvtto_linux_mask(bsa->sa_flags, SA_NOCLDSTOP,
LINUX_SA_NOCLDSTOP);
lsa->sa_flags |= cvtto_linux_mask(bsa->sa_flags, SA_ONSTACK,
LINUX_SA_ONSTACK);
lsa->sa_flags |= cvtto_linux_mask(bsa->sa_flags, SA_RESTART,
LINUX_SA_RESTART);
lsa->sa_restorer = NULL;
}
/*
* The Linux sigaction() system call. Do the usual conversions,
* and just call sigaction(). Some flags and values are silently
* ignored (see above).
*/
int
linux_sigaction(p, uap, retval)
register struct proc *p;
struct linux_sigaction_args /* {
syscallarg(int) signum;
syscallarg(struct linux_sigaction *) nsa;
syscallarg(struct linux_sigaction *) osa;
} */ *uap;
register_t *retval;
{
struct sigaction *nbsda = NULL, *obsda = NULL, tmpbsda;
struct linux_sigaction *nlsa, *olsa, tmplsa;
struct sigaction_args sa;
caddr_t sg;
int error;
sg = stackgap_init();
olsa = SCARG(uap, osa);
nlsa = SCARG(uap, nsa);
if (olsa != NULL)
obsda = stackgap_alloc(&sg, sizeof (struct sigaction));
if (nlsa != NULL) {
nbsda = stackgap_alloc(&sg, sizeof (struct sigaction));
if ((error = copyin(nlsa, &tmplsa, sizeof tmplsa)))
return error;
linux_to_bsd_sigaction(&tmplsa, &tmpbsda);
if ((error = copyout(&tmpbsda, nbsda, sizeof tmpbsda)))
return error;
}
SCARG(&sa, signum) = linux_to_bsd_sig(SCARG(uap, signum));
SCARG(&sa, nsa) = nbsda;
SCARG(&sa, osa) = obsda;
if ((error = sigaction(p, &sa, retval)))
return error;
if (olsa != NULL) {
if ((error = copyin(obsda, &tmpbsda, sizeof tmpbsda)))
return error;
bsd_to_linux_sigaction(&tmpbsda, &tmplsa);
if ((error = copyout(&tmplsa, olsa, sizeof tmplsa)))
return error;
}
return 0;
}
/*
* The Linux signal() system call. I think that the signal() in the C
* library actually calls sigaction, so I doubt this one is ever used.
* But hey, it can't hurt having it here. The same restrictions as for
* sigaction() apply.
*/
int
linux_signal(p, uap, retval)
register struct proc *p;
struct linux_signal_args /* {
syscallarg(int) sig;
syscallarg(linux_handler_t) handler;
} */ *uap;
register_t *retval;
{
caddr_t sg;
struct sigaction_args sa_args;
struct sigaction *osa, *nsa, tmpsa;
int error;
sg = stackgap_init();
nsa = stackgap_alloc(&sg, sizeof *nsa);
osa = stackgap_alloc(&sg, sizeof *osa);
tmpsa.sa_handler = SCARG(uap, handler);
tmpsa.sa_mask = (sigset_t) 0;
tmpsa.sa_flags = 0;
if ((error = copyout(&tmpsa, nsa, sizeof tmpsa)))
return error;
SCARG(&sa_args, signum) = linux_to_bsd_sig(SCARG(uap, sig));
SCARG(&sa_args, osa) = osa;
SCARG(&sa_args, nsa) = nsa;
if ((error = sigaction(p, &sa_args, retval)))
return error;
if ((error = copyin(osa, &tmpsa, sizeof *osa)))
return error;
retval[0] = (register_t) tmpsa.sa_handler;
return 0;
}
/*
* This is just a copy of the svr4 compat one. I feel so creative now.
*/
int
linux_sigprocmask(p, uap, retval)
register struct proc *p;
register struct linux_sigprocmask_args /* {
syscallarg(int) how;
syscallarg(linux_sigset_t *) set;
syscallarg(linux_sigset_t * oset;
} */ *uap;
register_t *retval;
{
linux_sigset_t ss;
sigset_t bs;
int error = 0;
*retval = 0;
if (SCARG(uap, oset) != NULL) {
/* Fix the return value first if needed */
bsd_to_linux_sigset(&p->p_sigmask, &ss);
if ((error = copyout(&ss, SCARG(uap, oset), sizeof(ss))) != 0)
return error;
}
if (SCARG(uap, set) == NULL)
/* Just examine */
return 0;
if ((error = copyin(SCARG(uap, set), &ss, sizeof(ss))) != 0)
return error;
linux_to_bsd_sigset(&ss, &bs);
(void) splhigh();
switch (SCARG(uap, how)) {
case LINUX_SIG_BLOCK:
p->p_sigmask |= bs & ~sigcantmask;
break;
case LINUX_SIG_UNBLOCK:
p->p_sigmask &= ~bs;
break;
case LINUX_SIG_SETMASK:
p->p_sigmask = bs & ~sigcantmask;
break;
default:
error = EINVAL;
break;
}
(void) spl0();
return error;
}
/*
* The functions below really make no distinction between an int
* and [linux_]sigset_t. This is ok for now, but it might break
* sometime. Then again, sigset_t is trusted to be an int everywhere
* else in the kernel too.
*/
/* ARGSUSED */
int
linux_siggetmask(p, uap, retval)
struct proc *p;
void *uap;
register_t *retval;
{
bsd_to_linux_sigset(&p->p_sigmask, (linux_sigset_t *) retval);
return 0;
}
/*
* The following three functions fiddle with a process' signal mask.
* Convert the signal masks because of the different signal
* values for Linux. The need for this is the reason why
* they are here, and have not been mapped directly.
*/
int
linux_sigsetmask(p, uap, retval)
struct proc *p;
struct linux_sigsetmask_args /* {
syscallarg(linux_sigset_t) mask;
} */ *uap;
register_t *retval;
{
linux_sigset_t mask;
sigset_t bsdsig;
bsd_to_linux_sigset(&p->p_sigmask, (linux_sigset_t *) retval);
mask = SCARG(uap, mask);
bsd_to_linux_sigset(&mask, &bsdsig);
splhigh();
p->p_sigmask = bsdsig & ~sigcantmask;
spl0();
return 0;
}
int
linux_sigpending(p, uap, retval)
struct proc *p;
struct linux_sigpending_args /* {
syscallarg(linux_sigset_t *) mask;
} */ *uap;
register_t *retval;
{
sigset_t bsdsig;
linux_sigset_t linuxsig;
bsdsig = p->p_siglist & p->p_sigmask;
bsd_to_linux_sigset(&bsdsig, &linuxsig);
return copyout(&linuxsig, SCARG(uap, mask), sizeof linuxsig);
}
int
linux_sigsuspend(p, uap, retval)
struct proc *p;
struct linux_sigsuspend_args /* {
syscallarg(caddr_t) restart;
syscallarg(int) oldmask;
syscallarg(int) mask;
} */ *uap;
register_t *retval;
{
struct sigsuspend_args ssa;
linux_to_bsd_sigset(&SCARG(uap, mask), &SCARG(&ssa, mask));
return sigsuspend(p, &ssa, retval);
}
/*
* The deprecated pause(2), which is really just an instance
* of sigsuspend(2).
*/
int
linux_pause(p, uap, retval)
struct proc *p;
void *uap;
register_t *retval;
{
struct sigsuspend_args bsa;
SCARG(&bsa, mask) = p->p_sigmask;
return sigsuspend(p, &bsa, retval);
}
/*
* Once more: only a signal conversion is needed.
*/
int
linux_kill(p, uap, retval)
struct proc *p;
struct linux_kill_args /* {
syscallarg(int) pid;
syscallarg(int) signum;
} */ *uap;
register_t *retval;
{
SCARG(uap, signum) = linux_to_bsd_sig(SCARG(uap, signum));
return kill(p, (struct kill_args *) uap, retval);
}
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