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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