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NetBSD/sys/compat/ibcs2/ibcs2_signal.c
mycroft fb526e055c Substantial signal handling changes: 
* Increase the size of sigset_t to accomodate 128 signals -- adding new
  versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
  sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
  sys_sigpending() and sys_sigsuspend() into separate functions, and call them
  from all the emulations rather than hard-coding everything.  (Avoids uses
  the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
  pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
  bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
  in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified.  Other ports and
emulations need to be updated.
1998-09-11 12:50:05 +00:00

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/* $NetBSD: ibcs2_signal.c,v 1.10 1998/09/11 12:50:08 mycroft Exp $ */
/*
* Copyright (c) 1995 Scott Bartram
* 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. 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.
*/
#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/ibcs2/ibcs2_types.h>
#include <compat/ibcs2/ibcs2_signal.h>
#include <compat/ibcs2/ibcs2_syscallargs.h>
#include <compat/ibcs2/ibcs2_util.h>
#define ibcs2_sigmask(n) (1 << ((n) - 1))
#define ibcs2_sigemptyset(s) memset((s), 0, sizeof(*(s)))
#define ibcs2_sigismember(s, n) (*(s) & ibcs2_sigmask(n))
#define ibcs2_sigaddset(s, n) (*(s) |= ibcs2_sigmask(n))
int native_to_ibcs2_sig[NSIG] = {
0, /* 0 */
IBCS2_SIGHUP, /* 1 */
IBCS2_SIGINT, /* 2 */
IBCS2_SIGQUIT, /* 3 */
IBCS2_SIGILL, /* 4 */
IBCS2_SIGTRAP, /* 5 */
IBCS2_SIGABRT, /* 6 */
IBCS2_SIGEMT, /* 7 */
IBCS2_SIGFPE, /* 8 */
IBCS2_SIGKILL, /* 9 */
IBCS2_SIGBUS, /* 10 */
IBCS2_SIGSEGV, /* 11 */
IBCS2_SIGSYS, /* 12 */
IBCS2_SIGPIPE, /* 13 */
IBCS2_SIGALRM, /* 14 */
IBCS2_SIGTERM, /* 15 */
0, /* 16 - SIGURG */
IBCS2_SIGSTOP, /* 17 */
IBCS2_SIGTSTP, /* 18 */
IBCS2_SIGCONT, /* 19 */
IBCS2_SIGCLD, /* 20 */
IBCS2_SIGTTIN, /* 21 */
IBCS2_SIGTTOU, /* 22 */
IBCS2_SIGPOLL, /* 23 */
IBCS2_SIGXCPU, /* 24 */
IBCS2_SIGXFSZ, /* 25 */
IBCS2_SIGVTALRM, /* 26 */
IBCS2_SIGPROF, /* 27 */
IBCS2_SIGWINCH, /* 28 */
0, /* 29 - SIGINFO */
IBCS2_SIGUSR1, /* 30 */
IBCS2_SIGUSR2, /* 31 */
IBCS2_SIGPWR, /* 32 */
};
int ibcs2_to_native_sig[IBCS2_NSIG] = {
0, /* 0 */
SIGHUP, /* 1 */
SIGINT, /* 2 */
SIGQUIT, /* 3 */
SIGILL, /* 4 */
SIGTRAP, /* 5 */
SIGABRT, /* 6 */
SIGEMT, /* 7 */
SIGFPE, /* 8 */
SIGKILL, /* 9 */
SIGBUS, /* 10 */
SIGSEGV, /* 11 */
SIGSYS, /* 12 */
SIGPIPE, /* 13 */
SIGALRM, /* 14 */
SIGTERM, /* 15 */
SIGUSR1, /* 16 */
SIGUSR2, /* 17 */
SIGCHLD, /* 18 */
SIGPWR, /* 19 */
SIGWINCH, /* 20 */
0, /* 21 - SIGPHONE */
SIGIO, /* 22 */
SIGSTOP, /* 23 */
SIGTSTP, /* 24 */
SIGCONT, /* 25 */
SIGTTIN, /* 26 */
SIGTTOU, /* 27 */
SIGVTALRM, /* 28 */
SIGPROF, /* 29 */
SIGXCPU, /* 30 */
SIGXFSZ, /* 31 */
};
void ibcs2_to_native_sigaction __P((const struct ibcs2_sigaction *, struct sigaction *));
void native_to_ibcs2_sigaction __P((const struct sigaction *, struct ibcs2_sigaction *));
void ibcs2_to_native_sigaltstack __P((const struct ibcs2_sigaltstack *, struct sigaltstack *));
void native_to_ibcs2_sigaltstack __P((const struct sigaltstack *, struct ibcs2_sigaltstack *));
void
ibcs2_to_native_sigset(iss, bss)
const ibcs2_sigset_t *iss;
sigset_t *bss;
{
int i, newsig;
sigemptyset(bss);
for (i = 1; i < IBCS2_NSIG; i++) {
if (ibcs2_sigismember(iss, i)) {
newsig = ibcs2_to_native_sig[i];
if (newsig)
sigaddset(bss, newsig);
}
}
}
void
native_to_ibcs2_sigset(bss, iss)
const sigset_t *bss;
ibcs2_sigset_t *iss;
{
int i, newsig;
ibcs2_sigemptyset(iss);
for (i = 1; i < NSIG; i++) {
if (sigismember(bss, i)) {
newsig = native_to_ibcs2_sig[i];
if (newsig)
ibcs2_sigaddset(iss, newsig);
}
}
}
void
ibcs2_to_native_sigaction(isa, bsa)
const struct ibcs2_sigaction *isa;
struct sigaction *bsa;
{
bsa->sa_handler = isa->sa_handler;
ibcs2_to_native_sigset(&isa->sa_mask, &bsa->sa_mask);
bsa->sa_flags = 0;
if ((isa->sa_flags & IBCS2_SA_NOCLDSTOP) != 0)
bsa->sa_flags |= SA_NOCLDSTOP;
if ((isa->sa_flags & IBCS2_SA_RESETHAND) != 0)
bsa->sa_flags |= SA_RESETHAND;
if ((isa->sa_flags & IBCS2_SA_RESTART) != 0)
bsa->sa_flags |= SA_RESTART;
if ((isa->sa_flags & IBCS2_SA_SIGINFO) != 0)
/*XXX*/ printf("ibcs2_to_native_sigaction: SA_SIGINFO ignored\n");
if ((isa->sa_flags & IBCS2_SA_NODEFER) != 0)
bsa->sa_flags |= SA_NODEFER;
if ((isa->sa_flags & IBCS2_SA_ONSTACK) != 0)
bsa->sa_flags |= SA_ONSTACK;
if ((isa->sa_flags & IBCS2_SA_NOCLDWAIT) != 0)
/*XXX*/ printf("ibcs2_to_native_sigaction: SA_NOCLDWAIT ignored\n");
if ((isa->sa_flags & ~IBCS2_SA_ALLBITS) != 0)
/*XXX*/ printf("ibcs2_to_native_sigaction: extra bits ignored\n");
}
void
native_to_ibcs2_sigaction(bsa, isa)
const struct sigaction *bsa;
struct ibcs2_sigaction *isa;
{
isa->sa_handler = bsa->sa_handler;
native_to_ibcs2_sigset(&bsa->sa_mask, &isa->sa_mask);
isa->sa_flags = 0;
if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
isa->sa_flags |= IBCS2_SA_NOCLDSTOP;
if ((bsa->sa_flags & SA_RESETHAND) != 0)
isa->sa_flags |= IBCS2_SA_RESETHAND;
if ((bsa->sa_flags & SA_RESTART) != 0)
isa->sa_flags |= IBCS2_SA_RESTART;
if ((bsa->sa_flags & SA_NODEFER) != 0)
isa->sa_flags |= IBCS2_SA_NODEFER;
if ((bsa->sa_flags & SA_ONSTACK) != 0)
isa->sa_flags |= IBCS2_SA_ONSTACK;
}
void
ibcs2_to_native_sigaltstack(sss, bss)
const struct ibcs2_sigaltstack *sss;
struct sigaltstack *bss;
{
bss->ss_sp = sss->ss_sp;
bss->ss_size = sss->ss_size;
bss->ss_flags = 0;
if ((sss->ss_flags & IBCS2_SS_DISABLE) != 0)
bss->ss_flags |= SS_DISABLE;
if ((sss->ss_flags & IBCS2_SS_ONSTACK) != 0)
bss->ss_flags |= SS_ONSTACK;
if ((sss->ss_flags & ~IBCS2_SS_ALLBITS) != 0)
/*XXX*/ printf("ibcs2_to_native_sigaltstack: extra bits ignored\n");
}
void
native_to_ibcs2_sigaltstack(bss, sss)
const struct sigaltstack *bss;
struct ibcs2_sigaltstack *sss;
{
sss->ss_sp = bss->ss_sp;
sss->ss_size = bss->ss_size;
sss->ss_flags = 0;
if ((bss->ss_flags & SS_DISABLE) != 0)
sss->ss_flags |= IBCS2_SS_DISABLE;
if ((bss->ss_flags & SS_ONSTACK) != 0)
sss->ss_flags |= IBCS2_SS_ONSTACK;
}
int
ibcs2_sys_sigaction(p, v, retval)
register struct proc *p;
void *v;
register_t *retval;
{
struct ibcs2_sys_sigaction_args /* {
syscallarg(int) signum;
syscallarg(const struct ibcs2_sigaction *) nsa;
syscallarg(struct ibcs2_sigaction *) osa;
} */ *uap = v;
struct ibcs2_sigaction nisa, oisa;
struct sigaction nbsa, obsa;
int error;
if (SCARG(uap, nsa)) {
error = copyin(SCARG(uap, nsa), &nisa, sizeof(nisa));
if (error)
return (error);
ibcs2_to_native_sigaction(&nisa, &nbsa);
}
error = sigaction1(p, ibcs2_to_native_sig[SCARG(uap, signum)],
SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0);
if (error)
return (error);
if (SCARG(uap, osa)) {
native_to_ibcs2_sigaction(&obsa, &oisa);
error = copyout(&oisa, SCARG(uap, osa), sizeof(oisa));
if (error)
return (error);
}
return (0);
}
int
ibcs2_sys_sigaltstack(p, v, retval)
register struct proc *p;
void *v;
register_t *retval;
{
struct ibcs2_sys_sigaltstack_args /* {
syscallarg(const struct ibcs2_sigaltstack *) nss;
syscallarg(struct ibcs2_sigaltstack *) oss;
} */ *uap = v;
struct ibcs2_sigaltstack nsss, osss;
struct sigaltstack nbss, obss;
int error;
if (SCARG(uap, nss)) {
error = copyin(SCARG(uap, nss), &nsss, sizeof(nsss));
if (error)
return (error);
ibcs2_to_native_sigaltstack(&nsss, &nbss);
}
error = sigaltstack1(p,
SCARG(uap, nss) ? &nbss : 0, SCARG(uap, oss) ? &obss : 0);
if (error)
return (error);
if (SCARG(uap, oss)) {
native_to_ibcs2_sigaltstack(&obss, &osss);
error = copyout(&osss, SCARG(uap, oss), sizeof(osss));
if (error)
return (error);
}
return (0);
}
int
ibcs2_sys_sigsys(p, v, retval)
register struct proc *p;
void *v;
register_t *retval;
{
struct ibcs2_sys_sigsys_args /* {
syscallarg(int) sig;
syscallarg(ibcs2_sig_t) fp;
} */ *uap = v;
int signum = ibcs2_to_native_sig[IBCS2_SIGNO(SCARG(uap, sig))];
struct sigaction nbsa, obsa;
sigset_t ss;
int error;
if (signum <= 0 || signum >= IBCS2_NSIG)
return (EINVAL);
switch (IBCS2_SIGCALL(SCARG(uap, sig))) {
case IBCS2_SIGSET_MASK:
if (SCARG(uap, fp) == IBCS2_SIG_HOLD)
goto sighold;
/* FALLTHROUGH */
case IBCS2_SIGNAL_MASK:
nbsa.sa_handler = (sig_t)SCARG(uap, fp);
sigemptyset(&nbsa.sa_mask);
nbsa.sa_flags = 0;
error = sigaction1(p, signum, &nbsa, &obsa);
if (error)
return (error);
*retval = (int)obsa.sa_handler;
return (0);
case IBCS2_SIGHOLD_MASK:
sighold:
sigemptyset(&ss);
sigaddset(&ss, signum);
return (sigprocmask1(p, SIG_BLOCK, &ss, 0));
case IBCS2_SIGRELSE_MASK:
sigemptyset(&ss);
sigaddset(&ss, signum);
return (sigprocmask1(p, SIG_UNBLOCK, &ss, 0));
case IBCS2_SIGIGNORE_MASK:
nbsa.sa_handler = SIG_IGN;
sigemptyset(&nbsa.sa_mask);
nbsa.sa_flags = 0;
return (sigaction1(p, signum, &nbsa, 0));
case IBCS2_SIGPAUSE_MASK:
ss = p->p_sigmask;
sigdelset(&ss, signum);
return (sigsuspend1(p, &ss));
default:
return (ENOSYS);
}
}
int
ibcs2_sys_sigprocmask(p, v, retval)
register struct proc *p;
void *v;
register_t *retval;
{
struct ibcs2_sys_sigprocmask_args /* {
syscallarg(int) how;
syscallarg(const ibcs2_sigset_t *) set;
syscallarg(ibcs2_sigset_t *) oset;
} */ *uap = v;
ibcs2_sigset_t niss, oiss;
sigset_t nbss, obss;
int how;
int error;
switch (SCARG(uap, how)) {
case IBCS2_SIG_BLOCK:
how = SIG_BLOCK;
break;
case IBCS2_SIG_UNBLOCK:
how = SIG_UNBLOCK;
break;
case IBCS2_SIG_SETMASK:
how = SIG_SETMASK;
break;
default:
return (EINVAL);
}
if (SCARG(uap, set)) {
error = copyin(SCARG(uap, set), &niss, sizeof(niss));
if (error)
return (error);
ibcs2_to_native_sigset(&niss, &nbss);
}
error = sigprocmask1(p, how,
SCARG(uap, set) ? &nbss : 0, SCARG(uap, oset) ? &obss : 0);
if (error)
return (error);
if (SCARG(uap, oset)) {
native_to_ibcs2_sigset(&obss, &oiss);
error = copyout(&oiss, SCARG(uap, oset), sizeof(oiss));
if (error)
return (error);
}
return (0);
}
int
ibcs2_sys_sigpending(p, v, retval)
register struct proc *p;
void *v;
register_t *retval;
{
struct ibcs2_sys_sigpending_args /* {
syscallarg(ibcs2_sigset_t *) set;
} */ *uap = v;
sigset_t bss;
ibcs2_sigset_t iss;
sigpending1(p, &bss);
native_to_ibcs2_sigset(&bss, &iss);
return (copyout(&iss, SCARG(uap, set), sizeof(iss)));
}
int
ibcs2_sys_sigsuspend(p, v, retval)
register struct proc *p;
void *v;
register_t *retval;
{
struct ibcs2_sys_sigsuspend_args /* {
syscallarg(const ibcs2_sigset_t *) set;
} */ *uap = v;
ibcs2_sigset_t sss;
sigset_t bss;
int error;
if (SCARG(uap, set)) {
error = copyin(SCARG(uap, set), &sss, sizeof(sss));
if (error)
return (error);
ibcs2_to_native_sigset(&sss, &bss);
}
return (sigsuspend1(p, SCARG(uap, set) ? &bss : 0));
}
int
ibcs2_sys_pause(p, v, retval)
register struct proc *p;
void *v;
register_t *retval;
{
return (sigsuspend1(p, 0));
}
int
ibcs2_sys_kill(p, v, retval)
register struct proc *p;
void *v;
register_t *retval;
{
struct ibcs2_sys_kill_args /* {
syscallarg(int) pid;
syscallarg(int) signo;
} */ *uap = v;
struct sys_kill_args ka;
SCARG(&ka, pid) = SCARG(uap, pid);
SCARG(&ka, signum) = ibcs2_to_native_sig[SCARG(uap, signo)];
return sys_kill(p, &ka, retval);
}
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