initial import of NetBSD tree

1 files changed, 501 insertions, 0 deletions

diff --git a/sys/compat/linux/linux_signal.c b/sys/compat/linux/linux_signal.c
new file mode 100644
index 00000000000..212a0f254ee
--- /dev/null
+++ b/sys/compat/linux/linux_signal.c
@@ -0,0 +1,501 @@
+/*	$NetBSD: linux_signal.c,v 1.9 1995/10/07 06:27:12 mycroft 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_signal.h>
+#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,
+};
+
+/*
+ * 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
+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];
+			if (newsig)
+				sigaddset(bss, newsig);
+		}
+	}
+}
+
+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];
+			if (newsig)
+				linux_sigaddset(lss, newsig);
+		}
+	}
+}
+
+/*
+ * Convert between Linux and BSD sigaction structures. Linux has
+ * one extra field (sa_restorer) which we don't support.
+ */
+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;
+	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;
+}
+
+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;
+	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;
+	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_sys_sigaction(p, v, retval)
+	register struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct linux_sys_sigaction_args /* {
+		syscallarg(int) signum;
+		syscallarg(struct linux_sigaction *) nsa;
+		syscallarg(struct linux_sigaction *) osa;
+	} */ *uap = v;
+	struct linux_sigaction *nlsa, *olsa, tmplsa;
+	struct sigaction *nbsa, *obsa, tmpbsa;
+	struct sys_sigaction_args sa;
+	caddr_t sg;
+	int error;
+
+	sg = stackgap_init(p->p_emul);
+	nlsa = SCARG(uap, nsa);
+	olsa = SCARG(uap, osa);
+
+	if (olsa != NULL)
+		obsa = stackgap_alloc(&sg, sizeof(struct sigaction));
+	else
+		obsa = NULL;
+
+	if (nlsa != NULL) {
+		nbsa = stackgap_alloc(&sg, sizeof(struct sigaction));
+		if ((error = copyin(nlsa, &tmplsa, sizeof(tmplsa))) != 0)
+			return error;
+		linux_to_bsd_sigaction(&tmplsa, &tmpbsa);
+		if ((error = copyout(&tmpbsa, nbsa, sizeof(tmpbsa))) != 0)
+			return error;
+	} else
+		nbsa = NULL;
+
+	SCARG(&sa, signum) = linux_to_bsd_sig[SCARG(uap, signum)];
+	SCARG(&sa, nsa) = nbsa;
+	SCARG(&sa, osa) = obsa;
+
+	if ((error = sys_sigaction(p, &sa, retval)) != 0)
+		return error;
+
+	if (olsa != NULL) {
+		if ((error = copyin(obsa, &tmpbsa, sizeof(tmpbsa))) != 0)
+			return error;
+		bsd_to_linux_sigaction(&tmpbsa, &tmplsa);
+		if ((error = copyout(&tmplsa, olsa, sizeof(tmplsa))) != 0)
+			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_sys_signal(p, v, retval)
+	register struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct linux_sys_signal_args /* {
+		syscallarg(int) sig;
+		syscallarg(linux_handler_t) handler;
+	} */ *uap = v;
+	caddr_t sg;
+	struct sys_sigaction_args sa_args;
+	struct sigaction *osa, *nsa, tmpsa;
+	int error;
+
+	sg = stackgap_init(p->p_emul);
+	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;
+	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 = sys_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_sys_sigprocmask(p, v, retval)
+	register struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct linux_sys_sigprocmask_args /* {
+		syscallarg(int) how;
+		syscallarg(linux_sigset_t *) set;
+		syscallarg(linux_sigset_t *) oset;
+	} */ *uap = v;
+	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_sys_siggetmask(p, v, retval)
+	register struct proc *p;
+	void *v;
+	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_sys_sigsetmask(p, v, retval)
+	register struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct linux_sys_sigsetmask_args /* {
+		syscallarg(linux_sigset_t) mask;
+	} */ *uap = v;
+	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_sys_sigpending(p, v, retval)
+	register struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct linux_sys_sigpending_args /* {
+		syscallarg(linux_sigset_t *) mask;
+	} */ *uap = v;
+	sigset_t bs;
+	linux_sigset_t ls;
+
+	bs = p->p_siglist & p->p_sigmask;
+	bsd_to_linux_sigset(&bs, &ls);
+
+	return copyout(&ls, SCARG(uap, mask), sizeof(ls));
+}
+
+int
+linux_sys_sigsuspend(p, v, retval)
+	register struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct linux_sys_sigsuspend_args /* {
+		syscallarg(caddr_t) restart;
+		syscallarg(int) oldmask;
+		syscallarg(int) mask;
+	} */ *uap = v;
+	struct sys_sigsuspend_args sa;
+
+	linux_to_bsd_sigset(&SCARG(uap, mask), &SCARG(&sa, mask));
+	return sys_sigsuspend(p, &sa, retval);
+}
+
+/*
+ * The deprecated pause(2), which is really just an instance
+ * of sigsuspend(2).
+ */
+int
+linux_sys_pause(p, v, retval)
+	register struct proc *p;
+	void *v;	
+	register_t *retval;
+{	
+	struct sys_sigsuspend_args bsa;
+
+	SCARG(&bsa, mask) = p->p_sigmask;
+	return sys_sigsuspend(p, &bsa, retval);
+}
+
+/*
+ * Once more: only a signal conversion is needed.
+ */
+int
+linux_sys_kill(p, v, retval)
+	register struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct linux_sys_kill_args /* {
+		syscallarg(int) pid;
+		syscallarg(int) signum;
+	} */ *uap = v;
+	struct sys_kill_args ka;
+
+	SCARG(&ka, pid) = SCARG(uap, pid);
+	SCARG(&ka, signum) = linux_to_bsd_sig[SCARG(uap, signum)];
+	return sys_kill(p, &ka, retval);
+}