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Annotation of src/lib/libc/gen/sigset.c, Revision 1.1

1.1     ! kleink      1: /*     $NetBSD$        */
        !             2:
        !             3: /*-
        !             4:  * Copyright (c) 2003 The NetBSD Foundation, Inc.
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * This code is derived from software contributed to The NetBSD Foundation
        !             8:  * by Klaus Klein.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *        This product includes software developed by the NetBSD
        !            21:  *        Foundation, Inc. and its contributors.
        !            22:  * 4. Neither the name of The NetBSD Foundation nor the names of its
        !            23:  *    contributors may be used to endorse or promote products derived
        !            24:  *    from this software without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
        !            27:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
        !            28:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        !            29:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
        !            30:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        !            31:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
        !            32:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
        !            33:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
        !            34:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
        !            35:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            36:  * POSSIBILITY OF SUCH DAMAGE.
        !            37:  */
        !            38:
        !            39: #include <sys/cdefs.h>
        !            40: #if defined(LIBC_SCCS) && !defined(lint)
        !            41: __RCSID("$NetBSD$");
        !            42: #endif
        !            43:
        !            44: #include "namespace.h"
        !            45: #include <errno.h>
        !            46: #include <signal.h>
        !            47: #include <stddef.h>
        !            48:
        !            49: sig_t
        !            50: sigset(int sig, void (*disp)(int))
        !            51: {
        !            52:        sigset_t set, oset;
        !            53:        struct sigaction sa, osa;
        !            54:
        !            55:        osa.sa_handler = SIG_ERR;
        !            56:
        !            57:        if (disp == SIG_HOLD) {
        !            58:                /* Add sig to current signal mask. */
        !            59:                if (sigemptyset(&set) != 0)
        !            60:                        goto out;
        !            61:                if (sigaddset(&set, sig) != 0)
        !            62:                        goto out;
        !            63:                if (sigprocmask(SIG_BLOCK, &set, &oset) != 0)
        !            64:                        goto out;
        !            65:
        !            66:                if (sigismember(&oset, sig)) {
        !            67:                        /* Had been masked before, return SIG_HOLD. */
        !            68:                        osa.sa_handler = SIG_HOLD;
        !            69:                } else {
        !            70:                        /* Return previous disposition. */
        !            71:                        (void)sigaction(sig, NULL, &osa);
        !            72:                }
        !            73:        } else if (disp == SIG_ERR) {
        !            74:                errno = EINVAL;
        !            75:        } else {
        !            76:                /* Set up and install new disposition. */
        !            77:                sa.sa_handler = disp;
        !            78:                if (sigemptyset(&sa.sa_mask) != 0)
        !            79:                        goto out;
        !            80:                sa.sa_flags = 0;
        !            81:
        !            82:                if (sigaction(sig, &sa, &osa) != 0) {
        !            83:                        osa.sa_handler = SIG_ERR;
        !            84:                        goto out;
        !            85:                }
        !            86:
        !            87:                /* Delete sig from current signal mask. */
        !            88:                if (sigemptyset(&set) != 0)
        !            89:                        return (SIG_ERR);
        !            90:                if (sigaddset(&set, sig) != 0)
        !            91:                        return (SIG_ERR);
        !            92:                if (sigprocmask(SIG_UNBLOCK, &set, &oset) != 0)
        !            93:                        return (SIG_ERR);
        !            94:
        !            95:                /* If had been masked before, return SIG_HOLD. */
        !            96:                if (sigismember(&oset, sig))
        !            97:                        osa.sa_handler = SIG_HOLD;
        !            98:        }
        !            99:
        !           100:  out:
        !           101:        return (osa.sa_handler);
        !           102: }

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