common/syscall/sigprocmask.c

/*
 * 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 */

#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>

/* ARGSUSED4 */
int64_t
lwp_sigmask(int how, uint_t bits0, uint_t bits1, uint_t bits2, uint_t bits3)
{
    kthread_t *t = curthread;
    proc_t *p = ttoproc(t);
    rval_t rv;

    /*
     * We don't need to acquire p->p_lock here;
     * we are manipulating thread-private data.
     */

    schedctl_finish_sigblock(t);

    bits0 &= (FILLSET0 & ~CANTMASK0);
    bits1 &= (FILLSET1 & ~CANTMASK1);
    bits2 &= (FILLSET2 & ~CANTMASK2);

    /*
     * As a sop to the s10 brand, we continue to return
     * the first two words of the signal mask, regardless
     * of the value of 'how', even though libc doesn't use them.
     */
    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;
        t->t_hold.__sigbits[2] |= bits2;
        break;
    case SIG_UNBLOCK:
        t->t_hold.__sigbits[0] &= ~bits0;
        t->t_hold.__sigbits[1] &= ~bits1;
        t->t_hold.__sigbits[2] &= ~bits2;
        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;
        t->t_hold.__sigbits[2] = bits2;
        if (sigcheck(p, t))
            t->t_sig_check = 1;
        break;
    }

    return (rv.r_vals);
}

int
sigprocmask(int how, sigset_t *setp, sigset_t *osetp)
{
    sigset_t set;
    sigset_t oset;
    k_sigset_t kset;

    /*
     * User's osetp and setp 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);
    }

    if (osetp) {
        sigktou(&curthread->t_hold, &oset);
        if (copyout((caddr_t)&oset, (caddr_t)osetp, sizeof (sigset_t)))
            return (set_errno(EFAULT));
    }

    if (setp) {
        (void) lwp_sigmask(how,
            kset.__sigbits[0],
            kset.__sigbits[1],
            kset.__sigbits[2],
            0);
    }

    return (0);
}