/*
 * 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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/bitmap.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/procset.h>
#include <sys/signal.h>
#include <sys/siginfo.h>
#include <sys/time.h>
#include <sys/kmem.h>
#include <sys/schedctl.h>
#include <sys/debug.h>
#include <sys/condvar_impl.h>
#include <sys/model.h>
#include <sys/sdt.h>
#include <sys/zone.h>

static int
copyout_siginfo(model_t datamodel, k_siginfo_t *ksip, void *uaddr)
{
        zoneid_t zoneid = getzoneid();

        if (datamodel == DATAMODEL_NATIVE) {
                if (SI_FROMUSER(ksip) && zoneid != GLOBAL_ZONEID &&
                    zoneid != ksip->si_zoneid) {
                        k_siginfo_t sani_sip = *ksip;
                        sani_sip.si_pid = curproc->p_zone->zone_zsched->p_pid;
                        sani_sip.si_uid = 0;
                        sani_sip.si_ctid = -1;
                        sani_sip.si_zoneid = zoneid;
                        if (copyout(&sani_sip, uaddr, sizeof (sani_sip)))
                                return (set_errno(EFAULT));
                } else {
                        if (copyout(ksip, uaddr, sizeof (*ksip)))
                                return (set_errno(EFAULT));
                }
        }
#ifdef _SYSCALL32_IMPL
        else {
                siginfo32_t si32;

                siginfo_kto32(ksip, &si32);
                if (SI_FROMUSER(ksip) && zoneid != GLOBAL_ZONEID &&
                    zoneid != ksip->si_zoneid) {
                        si32.si_pid = curproc->p_zone->zone_zsched->p_pid;
                        si32.si_uid = 0;
                        si32.si_ctid = -1;
                        si32.si_zoneid = zoneid;
                }
                if (copyout(&si32, uaddr, sizeof (si32)))
                        return (set_errno(EFAULT));
        }
#endif
        return (ksip->si_signo);
}

/*
 * Wait until a signal within a specified set is posted or until the
 * time interval 'timeout' if specified.  The signal is caught but
 * not delivered. The value of the signal is returned to the caller.
 */
int
sigtimedwait(sigset_t *setp, siginfo_t *siginfop, timespec_t *timeoutp)
{
        sigset_t set;
        k_sigset_t oldmask;
        kthread_t *t = curthread;
        klwp_t *lwp = ttolwp(t);
        proc_t *p = ttoproc(t);
        timespec_t sig_timeout;
        timespec_t *rqtp = NULL;
        int timecheck = 0;
        int ret;
        int error = 0;
        k_siginfo_t info, *infop;
        model_t datamodel = get_udatamodel();

        if (timeoutp) {
                timespec_t now;

                timecheck = timechanged;
                gethrestime(&now);
                if (datamodel == DATAMODEL_NATIVE) {
                        if (copyin(timeoutp, &sig_timeout,
                            sizeof (sig_timeout)))
                                return (set_errno(EFAULT));
                } else {
                        timespec32_t timeout32;

                        if (copyin(timeoutp, &timeout32, sizeof (timeout32)))
                                return (set_errno(EFAULT));
                        TIMESPEC32_TO_TIMESPEC(&sig_timeout, &timeout32)
                }

                if (itimerspecfix(&sig_timeout))
                        return (set_errno(EINVAL));
                /*
                 * Convert the timespec value into absolute time.
                 */
                timespecadd(&sig_timeout, &now);
                rqtp = &sig_timeout;
        }
        if (copyin(setp, &set, sizeof (set)))
                return (set_errno(EFAULT));
        sigutok(&set, &t->t_sigwait);
        if (sigisempty(&t->t_sigwait))
                return (set_errno(EINVAL));

        mutex_enter(&p->p_lock);
        /*
         * set the thread's signal mask to unmask
         * those signals in the specified set.
         */
        schedctl_finish_sigblock(t);
        oldmask = t->t_hold;
        sigdiffset(&t->t_hold, &t->t_sigwait);

        /*
         * Wait until we take a signal or until
         * the absolute future time is passed.
         */
        while ((ret = cv_waituntil_sig(&t->t_delay_cv, &p->p_lock,
            rqtp, timecheck)) > 0)
                continue;
        if (ret == -1)
                error = EAGAIN;

        /*
         * Restore thread's signal mask to its previous value.
         */
        t->t_hold = oldmask;
        t->t_sig_check = 1;     /* so post_syscall sees new t_hold mask */

        if (error) {
                mutex_exit(&p->p_lock);
                sigemptyset(&t->t_sigwait);
                return (set_errno(error));      /* timer expired */
        }
        /*
         * Don't bother with signal if it is not in request set.
         */
        if (lwp->lwp_cursig == 0 ||
            !sigismember(&t->t_sigwait, lwp->lwp_cursig)) {
                mutex_exit(&p->p_lock);
                /*
                 * lwp_cursig is zero if pokelwps() awakened cv_wait_sig().
                 * This happens if some other thread in this process called
                 * forkall() or exit().
                 */
                sigemptyset(&t->t_sigwait);
                return (set_errno(EINTR));
        }

        if (lwp->lwp_curinfo)
                infop = &lwp->lwp_curinfo->sq_info;
        else {
                infop = &info;
                bzero(infop, sizeof (info));
                infop->si_signo = lwp->lwp_cursig;
                infop->si_code = SI_NOINFO;
        }

        lwp->lwp_ru.nsignals++;
        ret = lwp->lwp_cursig;
        DTRACE_PROC2(signal__clear, int, ret, ksiginfo_t *, infop);
        lwp->lwp_cursig = 0;
        lwp->lwp_extsig = 0;
        mutex_exit(&p->p_lock);

        if (siginfop)
                ret = copyout_siginfo(datamodel, infop, siginfop);
        if (lwp->lwp_curinfo) {
                siginfofree(lwp->lwp_curinfo);
                lwp->lwp_curinfo = NULL;
        }
        sigemptyset(&t->t_sigwait);
        return (ret);
}