/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/systm.h>
#include <sys/user.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/fault.h>
#include <sys/signal.h>
#include <sys/siginfo.h>
#include <sys/debug.h>

int
sigaction(int sig, struct sigaction *actp, struct sigaction *oactp)
{
        struct sigaction act;
        struct sigaction oact;
        k_sigset_t set;
        proc_t *p;
        user_t *ua;
        int sigcld_look = 0;

        if (sig <= 0 || sig >= NSIG ||
            (actp != NULL && sigismember(&cantmask, sig)))
                return (set_errno(EINVAL));

        /*
         * act and oact might be the same address, so copyin act first.
         */
        if (actp) {
#if defined(__sparc)
                void (*handler)();
#endif
                if (copyin(actp, &act, sizeof (act)))
                        return (set_errno(EFAULT));
#if defined(__sparc)
                /*
                 * Check alignment of handler
                 */
                handler = act.sa_handler;
                if (handler != SIG_IGN && handler != SIG_DFL &&
                    ((uintptr_t)handler & 0x3) != 0)
                        return (set_errno(EINVAL));
#endif
        }

        p = curproc;
        ua = PTOU(p);
        mutex_enter(&p->p_lock);

        if (oactp) {
                int flags;
                void (*disp)();

                disp = ua->u_signal[sig - 1];

                flags = 0;
                if (disp != SIG_DFL && disp != SIG_IGN) {
                        set = ua->u_sigmask[sig-1];
                        if (sigismember(&p->p_siginfo, sig))
                                flags |= SA_SIGINFO;
                        if (sigismember(&ua->u_sigrestart, sig))
                                flags |= SA_RESTART;
                        if (sigismember(&ua->u_sigonstack, sig))
                                flags |= SA_ONSTACK;
                        if (sigismember(&ua->u_sigresethand, sig))
                                flags |= SA_RESETHAND;
                        if (sigismember(&ua->u_signodefer, sig))
                                flags |= SA_NODEFER;
                } else
                        sigemptyset(&set);

                if (sig == SIGCLD) {
                        if (p->p_flag & SNOWAIT)
                                flags |= SA_NOCLDWAIT;
                        if (!(p->p_flag & SJCTL))
                                flags |= SA_NOCLDSTOP;
                }

                oact.sa_handler = disp;
                oact.sa_flags = flags;
                sigktou(&set, &oact.sa_mask);
        }

        if (actp) {
                if (sig == SIGCLD)
                        sigcld_look = 1;
                sigutok(&act.sa_mask, &set);
                setsigact(sig, act.sa_handler, &set, act.sa_flags);
        }

        mutex_exit(&p->p_lock);

        if (sigcld_look)
                sigcld_repost();

        if (oactp &&
            copyout(&oact, oactp, sizeof (oact)))
                return (set_errno(EFAULT));

        return (0);
}

#ifdef _SYSCALL32_IMPL

int
sigaction32(int sig, struct sigaction32 *actp, struct sigaction32 *oactp)
{
        struct sigaction32 act32;
        struct sigaction32 oact32;
        k_sigset_t set;
        proc_t *p;
        user_t *ua;
        int sigcld_look = 0;

        if (sig <= 0 || sig >= NSIG ||
            (actp != NULL && sigismember(&cantmask, sig)))
                return (set_errno(EINVAL));

        /*
         * act and oact might be the same address, so copyin act first.
         */
        if (actp) {
#if defined(__sparc)
                void (*handler)();
#endif
                if (copyin(actp, &act32, sizeof (act32)))
                        return (set_errno(EFAULT));
#if defined(__sparc)
                /*
                 * Check alignment of handler
                 */
                handler = (void (*)())(uintptr_t)act32.sa_handler;
                if (handler != SIG_IGN && handler != SIG_DFL &&
                    ((uintptr_t)handler & 0x3) != 0)
                        return (set_errno(EINVAL));
#endif
        }

        p = curproc;
        ua = PTOU(p);
        mutex_enter(&p->p_lock);

        if (oactp) {
                int flags;
                void (*disp)();

                disp = ua->u_signal[sig - 1];

                flags = 0;
                if (disp != SIG_DFL && disp != SIG_IGN) {
                        set = ua->u_sigmask[sig-1];
                        if (sigismember(&p->p_siginfo, sig))
                                flags |= SA_SIGINFO;
                        if (sigismember(&ua->u_sigrestart, sig))
                                flags |= SA_RESTART;
                        if (sigismember(&ua->u_sigonstack, sig))
                                flags |= SA_ONSTACK;
                        if (sigismember(&ua->u_sigresethand, sig))
                                flags |= SA_RESETHAND;
                        if (sigismember(&ua->u_signodefer, sig))
                                flags |= SA_NODEFER;
                } else
                        sigemptyset(&set);

                if (sig == SIGCLD) {
                        if (p->p_flag & SNOWAIT)
                                flags |= SA_NOCLDWAIT;
                        if (!(p->p_flag & SJCTL))
                                flags |= SA_NOCLDSTOP;
                }

                oact32.sa_handler = (caddr32_t)(uintptr_t)disp;
                oact32.sa_flags = flags;
                sigktou(&set, &oact32.sa_mask);
        }

        if (actp) {
                if (sig == SIGCLD)
                        sigcld_look = 1;
                sigutok(&act32.sa_mask, &set);
                setsigact(sig, (void (*)())(uintptr_t)act32.sa_handler, &set,
                    act32.sa_flags);
        }

        mutex_exit(&p->p_lock);

        if (sigcld_look)
                sigcld_repost();

        if (oactp &&
            copyout(&oact32, oactp, sizeof (oact32)))
                return (set_errno(EFAULT));

        return (0);
}
#endif /* _SYSCALL32_IMPL */