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Annotation of src/lib/libc/gen/sigset.c, Revision 1.2

1.2     ! martin      1: /*     $NetBSD: sigset.c,v 1.1 2003/01/15 23:55:43 kleink Exp $        */
1.1       kleink      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:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     20:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     21:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     22:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     23:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     24:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     25:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     26:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     27:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     28:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     29:  * POSSIBILITY OF SUCH DAMAGE.
                     30:  */
                     31:
                     32: #include <sys/cdefs.h>
                     33: #if defined(LIBC_SCCS) && !defined(lint)
1.2     ! martin     34: __RCSID("$NetBSD: sigset.c,v 1.1 2003/01/15 23:55:43 kleink Exp $");
1.1       kleink     35: #endif
                     36:
                     37: #include "namespace.h"
                     38: #include <errno.h>
                     39: #include <signal.h>
                     40: #include <stddef.h>
                     41:
                     42: sig_t
                     43: sigset(int sig, void (*disp)(int))
                     44: {
                     45:        sigset_t set, oset;
                     46:        struct sigaction sa, osa;
                     47:
                     48:        osa.sa_handler = SIG_ERR;
                     49:
                     50:        if (disp == SIG_HOLD) {
                     51:                /* Add sig to current signal mask. */
                     52:                if (sigemptyset(&set) != 0)
                     53:                        goto out;
                     54:                if (sigaddset(&set, sig) != 0)
                     55:                        goto out;
                     56:                if (sigprocmask(SIG_BLOCK, &set, &oset) != 0)
                     57:                        goto out;
                     58:
                     59:                if (sigismember(&oset, sig)) {
                     60:                        /* Had been masked before, return SIG_HOLD. */
                     61:                        osa.sa_handler = SIG_HOLD;
                     62:                } else {
                     63:                        /* Return previous disposition. */
                     64:                        (void)sigaction(sig, NULL, &osa);
                     65:                }
                     66:        } else if (disp == SIG_ERR) {
                     67:                errno = EINVAL;
                     68:        } else {
                     69:                /* Set up and install new disposition. */
                     70:                sa.sa_handler = disp;
                     71:                if (sigemptyset(&sa.sa_mask) != 0)
                     72:                        goto out;
                     73:                sa.sa_flags = 0;
                     74:
                     75:                if (sigaction(sig, &sa, &osa) != 0) {
                     76:                        osa.sa_handler = SIG_ERR;
                     77:                        goto out;
                     78:                }
                     79:
                     80:                /* Delete sig from current signal mask. */
                     81:                if (sigemptyset(&set) != 0)
                     82:                        return (SIG_ERR);
                     83:                if (sigaddset(&set, sig) != 0)
                     84:                        return (SIG_ERR);
                     85:                if (sigprocmask(SIG_UNBLOCK, &set, &oset) != 0)
                     86:                        return (SIG_ERR);
                     87:
                     88:                /* If had been masked before, return SIG_HOLD. */
                     89:                if (sigismember(&oset, sig))
                     90:                        osa.sa_handler = SIG_HOLD;
                     91:        }
                     92:
                     93:  out:
                     94:        return (osa.sa_handler);
                     95: }