usr/src/lib/libc/port/gen/sigsetops.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 /*
  33  * POSIX signal manipulation functions.
  34  */
  35 #pragma weak _sigfillset = sigfillset
  36 #pragma weak _sigemptyset = sigemptyset
  37 #pragma weak _sigaddset = sigaddset
  38 #pragma weak _sigdelset = sigdelset
  39 #pragma weak _sigismember = sigismember
  40
  41 #include "lint.h"
  42 #include <sys/types.h>
  43 #include <stdio.h>
  44 #include <sys/param.h>
  45 #include <sys/signal.h>
  46 #include <errno.h>
  47 #include "libc.h"
  48
  49 #define SIGSETSIZE      4
  50 #define MAXBITNO (NBPW*8)
  51
  52 static sigset_t sigs;
  53 static int sigsinit;
  54
  55 #define sigword(n) ((n-1)/MAXBITNO)
  56 #define bitmask(n) (1L<<((n-1)%MAXBITNO))
  57
  58 static int
  59 sigvalid(int sig)
  60 {
  61         if (sig <= 0 || sig > (MAXBITNO * SIGSETSIZE))
  62                 return (0);
  63
  64         if (!sigsinit) {
  65                 (void) __sigfillset(&sigs);
  66                 sigsinit++;
  67         }
  68
  69         return ((sigs.__sigbits[sigword(sig)] & bitmask(sig)) != 0);
  70 }
  71
  72 int
  73 sigfillset(sigset_t *set)
  74 {
  75         if (!sigsinit) {
  76                 (void) __sigfillset(&sigs);
  77                 sigsinit++;
  78         }
  79
  80         *set = sigs;
  81         return (0);
  82 }
  83
  84 int
  85 sigemptyset(sigset_t *set)
  86 {
  87         set->__sigbits[0] = 0;
  88         set->__sigbits[1] = 0;
  89         set->__sigbits[2] = 0;
  90         set->__sigbits[3] = 0;
  91         return (0);
  92 }
  93
  94 int
  95 sigaddset(sigset_t *set, int sig)
  96 {
  97         if (!sigvalid(sig)) {
  98                 errno = EINVAL;
  99                 return (-1);
 100         }
 101         set->__sigbits[sigword(sig)] |= bitmask(sig);
 102         return (0);
 103 }
 104
 105 int
 106 sigdelset(sigset_t *set, int sig)
 107 {
 108         if (!sigvalid(sig)) {
 109                 errno = EINVAL;
 110                 return (-1);
 111         }
 112         set->__sigbits[sigword(sig)] &= ~bitmask(sig);
 113         return (0);
 114 }
 115
 116 int
 117 sigismember(const sigset_t *set, int sig)
 118 {
 119         if (!sigvalid(sig)) {
 120                 errno = EINVAL;
 121                 return (-1);
 122         }
 123         return ((set->__sigbits[sigword(sig)] & bitmask(sig)) != 0);
 124 }