common/syscall/sigprocmask.c

	sigprocmask.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 (c) 1984, 1986, 1987, 1988, 1989 AT&T */


/*
 * Copyright 1994-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

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

int64_t
lwp_sigmask(int how, uint_t bits0, uint_t bits1)
{
    kthread_t *t = curthread;
    proc_t *p = ttoproc(t);
    rval_t rv;

    mutex_enter(&p->p_lock);
    schedctl_finish_sigblock(t);

    bits0 &= (FILLSET0 & ~CANTMASK0);
    bits1 &= (FILLSET1 & ~CANTMASK1);

    rv.r_val1 = t->t_hold.__sigbits[0];
    rv.r_val2 = t->t_hold.__sigbits[1];

    switch (how) {
    case SIG_BLOCK:
        t->t_hold.__sigbits[0] |= bits0;
        t->t_hold.__sigbits[1] |= bits1;
        break;
    case SIG_UNBLOCK:
        t->t_hold.__sigbits[0] &= ~bits0;
        t->t_hold.__sigbits[1] &= ~bits1;
        if (sigcheck(p, t))
            t->t_sig_check = 1;
        break;
    case SIG_SETMASK:
        t->t_hold.__sigbits[0] = bits0;
        t->t_hold.__sigbits[1] = bits1;
        if (sigcheck(p, t))
            t->t_sig_check = 1;
        break;
    }

    mutex_exit(&p->p_lock);
    return (rv.r_vals);
}

/*
 * This system call is no longer called from libc.
 * It exists solely for the benefit of statically-linked
 * binaries from the past.  It should be eliminated.
 */
int
sigprocmask(int how, sigset_t *setp, sigset_t *osetp)
{
    sigset_t set;
    k_sigset_t kset;
    rval_t rv;

    /*
     * User's oset and set might be the same address, so copyin first and
     * save before copying out.
     */
    if (setp) {
        switch (how) {
        case SIG_BLOCK:
        case SIG_UNBLOCK:
        case SIG_SETMASK:
            break;
        default:
            return (set_errno(EINVAL));
        }
        if (copyin((caddr_t)setp, (caddr_t)&set, sizeof (sigset_t)))
            return (set_errno(EFAULT));
        sigutok(&set, &kset);
    } else {
        /* none of SIG_BLOCK, SIG_UNBLOCK, SIG_SETMASK equals 0 */
        how = 0;
        sigemptyset(&kset);
    }

    rv.r_vals = lwp_sigmask(how, kset.__sigbits[0], kset.__sigbits[1]);

    if (osetp) {
        kset.__sigbits[0] = rv.r_val1;
        kset.__sigbits[1] = rv.r_val2;
        sigktou(&kset, &set);
        if (copyout((caddr_t)&set, (caddr_t)osetp, sizeof (sigset_t)))
            return (set_errno(EFAULT));
    }

    return (0);
}