NetBSD/sys/compat/linux/linux_signal.c

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/* $NetBSD: linux_signal.c,v 1.7 1995/08/14 01:12:15 mycroft Exp $ */
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/*
* 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>
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#include <compat/linux/linux_signal.h>
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#include <compat/linux/linux_syscallargs.h>
#include <compat/linux/linux_util.h>
#define sigemptyset(s) bzero((s), sizeof(*(s)))
#define sigismember(s, n) (*(s) & sigmask(n))
#define sigaddset(s, n) (*(s) |= sigmask(n))
#define linux_sigmask(n) (1 << ((n) - 1))
#define linux_sigemptyset(s) bzero((s), sizeof(*(s)))
#define linux_sigismember(s, n) (*(s) & linux_sigmask(n))
#define linux_sigaddset(s, n) (*(s) |= linux_sigmask(n))
int bsd_to_linux_sig[] = {
0,
LINUX_SIGHUP,
LINUX_SIGINT,
LINUX_SIGQUIT,
LINUX_SIGILL,
LINUX_SIGTRAP,
LINUX_SIGABRT,
0,
LINUX_SIGFPE,
LINUX_SIGKILL,
LINUX_SIGBUS,
LINUX_SIGSEGV,
0,
LINUX_SIGPIPE,
LINUX_SIGALRM,
LINUX_SIGTERM,
LINUX_SIGURG,
LINUX_SIGSTOP,
LINUX_SIGTSTP,
LINUX_SIGCONT,
LINUX_SIGCHLD,
LINUX_SIGTTIN,
LINUX_SIGTTOU,
LINUX_SIGIO,
LINUX_SIGXCPU,
LINUX_SIGXFSZ,
LINUX_SIGVTALRM,
LINUX_SIGPROF,
LINUX_SIGWINCH,
0,
LINUX_SIGUSR1,
LINUX_SIGUSR2,
};
int linux_to_bsd_sig[] = {
0,
SIGHUP,
SIGINT,
SIGQUIT,
SIGILL,
SIGTRAP,
SIGABRT,
SIGBUS,
SIGFPE,
SIGKILL,
SIGUSR1,
SIGSEGV,
SIGUSR2,
SIGPIPE,
SIGALRM,
SIGTERM,
0,
SIGCHLD,
SIGCONT,
SIGSTOP,
SIGTSTP,
SIGTTIN,
SIGTTOU,
SIGURG,
SIGXCPU,
SIGXFSZ,
SIGVTALRM,
SIGPROF,
SIGWINCH,
SIGIO,
0,
0,
};
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/*
* Ok, we know that Linux and BSD signals both are just an unsigned int.
* Don't bother to use the sigismember() stuff for now.
*/
void
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linux_to_bsd_sigset(lss, bss)
const linux_sigset_t *lss;
sigset_t *bss;
{
int i, newsig;
sigemptyset(bss);
for (i = 1; i < LINUX_NSIG; i++) {
if (linux_sigismember(lss, i)) {
newsig = linux_to_bsd_sig[i];
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if (newsig)
sigaddset(bss, newsig);
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}
}
}
void
bsd_to_linux_sigset(bss, lss)
const sigset_t *bss;
linux_sigset_t *lss;
{
int i, newsig;
linux_sigemptyset(lss);
for (i = 1; i < NSIG; i++) {
if (sigismember(bss, i)) {
newsig = bsd_to_linux_sig[i];
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if (newsig)
linux_sigaddset(lss, newsig);
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}
}
}
/*
* Convert between Linux and BSD sigaction structures. Linux has
* one extra field (sa_restorer) which we don't support.
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*/
void
linux_to_bsd_sigaction(lsa, bsa)
struct linux_sigaction *lsa;
struct sigaction *bsa;
{
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bsa->sa_handler = lsa->sa_handler;
linux_to_bsd_sigset(&bsa->sa_mask, &lsa->sa_mask);
bsa->sa_flags = 0;
if ((lsa->sa_flags & LINUX_SA_ONSTACK) != 0)
bsa->sa_flags |= SA_ONSTACK;
if ((lsa->sa_flags & LINUX_SA_RESTART) != 0)
bsa->sa_flags |= SA_RESTART;
if ((lsa->sa_flags & LINUX_SA_ONESHOT) != 0)
bsa->sa_flags |= SA_RESETHAND;
if ((lsa->sa_flags & LINUX_SA_NOCLDSTOP) != 0)
bsa->sa_flags |= SA_NOCLDSTOP;
if ((lsa->sa_flags & LINUX_SA_NOMASK) != 0)
bsa->sa_flags |= SA_NODEFER;
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}
void
bsd_to_linux_sigaction(bsa, lsa)
struct sigaction *bsa;
struct linux_sigaction *lsa;
{
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lsa->sa_handler = bsa->sa_handler;
bsd_to_linux_sigset(&lsa->sa_mask, &bsa->sa_mask);
lsa->sa_flags = 0;
if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
lsa->sa_flags |= LINUX_SA_NOCLDSTOP;
if ((bsa->sa_flags & SA_ONSTACK) != 0)
lsa->sa_flags |= LINUX_SA_ONSTACK;
if ((bsa->sa_flags & SA_RESTART) != 0)
lsa->sa_flags |= LINUX_SA_RESTART;
if ((bsa->sa_flags & SA_NODEFER) != 0)
lsa->sa_flags |= LINUX_SA_NOMASK;
if ((bsa->sa_flags & SA_RESETHAND) != 0)
lsa->sa_flags |= LINUX_SA_ONESHOT;
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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 linux_sigaction *nlsa, *olsa, tmplsa;
struct sigaction *nbsa, *obsa, tmpbsa;
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struct sigaction_args sa;
caddr_t sg;
int error;
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sg = stackgap_init(p->p_emul);
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nlsa = SCARG(uap, nsa);
olsa = SCARG(uap, osa);
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if (olsa != NULL)
obsa = stackgap_alloc(&sg, sizeof(struct sigaction));
else
obsa = NULL;
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if (nlsa != NULL) {
nbsa = stackgap_alloc(&sg, sizeof(struct sigaction));
if ((error = copyin(nlsa, &tmplsa, sizeof(tmplsa))) != 0)
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return error;
linux_to_bsd_sigaction(&tmplsa, &tmpbsa);
if ((error = copyout(&tmpbsa, nbsa, sizeof(tmpbsa))) != 0)
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return error;
} else
nbsa = NULL;
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SCARG(&sa, signum) = linux_to_bsd_sig[SCARG(uap, signum)];
SCARG(&sa, nsa) = nbsa;
SCARG(&sa, osa) = obsa;
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if ((error = sigaction(p, &sa, retval)) != 0)
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return error;
if (olsa != NULL) {
if ((error = copyin(obsa, &tmpbsa, sizeof(tmpbsa))) != 0)
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return error;
bsd_to_linux_sigaction(&tmpbsa, &tmplsa);
if ((error = copyout(&tmplsa, olsa, sizeof(tmplsa))) != 0)
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return error;
}
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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;
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sg = stackgap_init(p->p_emul);
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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 = SA_RESETHAND | SA_NODEFER;
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if ((error = copyout(&tmpsa, nsa, sizeof tmpsa)))
return error;
SCARG(&sa_args, signum) = linux_to_bsd_sig[SCARG(uap, sig)];
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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;
struct linux_sigprocmask_args /* {
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syscallarg(int) how;
syscallarg(linux_sigset_t *) set;
syscallarg(linux_sigset_t *) oset;
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} */ *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)
register struct proc *p;
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void *uap;
register_t *retval;
{
bsd_to_linux_sigset(&p->p_sigmask, (linux_sigset_t *)retval);
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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)
register struct proc *p;
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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);
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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)
register struct proc *p;
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struct linux_sigpending_args /* {
syscallarg(linux_sigset_t *) mask;
} */ *uap;
register_t *retval;
{
sigset_t bs;
linux_sigset_t ls;
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bs = p->p_siglist & p->p_sigmask;
bsd_to_linux_sigset(&bs, &ls);
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return copyout(&ls, SCARG(uap, mask), sizeof(ls));
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}
int
linux_sigsuspend(p, uap, retval)
register struct proc *p;
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struct linux_sigsuspend_args /* {
syscallarg(caddr_t) restart;
syscallarg(int) oldmask;
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syscallarg(int) mask;
} */ *uap;
register_t *retval;
{
struct sigsuspend_args sa;
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linux_to_bsd_sigset(&SCARG(uap, mask), &SCARG(&sa, mask));
return sigsuspend(p, &sa, retval);
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}
/*
* The deprecated pause(2), which is really just an instance
* of sigsuspend(2).
*/
int
linux_pause(p, uap, retval)
register struct proc *p;
void *uap;
register_t *retval;
{
struct sigsuspend_args bsa;
SCARG(&bsa, mask) = p->p_sigmask;
return sigsuspend(p, &bsa, retval);
}
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/*
* Once more: only a signal conversion is needed.
*/
int
linux_kill(p, uap, retval)
register struct proc *p;
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struct linux_kill_args /* {
syscallarg(int) pid;
syscallarg(int) signum;
} */ *uap;
register_t *retval;
{
struct kill_args ka;
SCARG(&ka, pid) = SCARG(uap, pid);
SCARG(&ka, signum) = linux_to_bsd_sig[SCARG(uap, signum)];
return kill(p, &ka, retval);
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}