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 /*
31 * POSIX signal manipulation functions.
32 */
33 #pragma weak _sigfillset = sigfillset
34 #pragma weak _sigemptyset = sigemptyset
35 #pragma weak _sigaddset = sigaddset
36 #pragma weak _sigdelset = sigdelset
37 #pragma weak _sigismember = sigismember
38
39 #include "lint.h"
40 #include <sys/types.h>
41 #include <stdio.h>
42 #include <sys/param.h>
43 #include <sys/signal.h>
44 #include <errno.h>
45 #include "libc.h"
46
47 #define SIGSETSIZE 4
48 #define MAXBITNO (NBPW*8)
49
50 static sigset_t sigs;
51 static int sigsinit;
52
53 #define sigword(n) ((n-1)/MAXBITNO)
54 #define bitmask(n) (1L<<((n-1)%MAXBITNO))
55
56 static int
sigvalid(int sig)57 sigvalid(int sig)
58 {
59 if (sig <= 0 || sig > (MAXBITNO * SIGSETSIZE))
60 return (0);
61
62 if (!sigsinit) {
63 (void) __sigfillset(&sigs);
64 sigsinit++;
65 }
66
67 return ((sigs.__sigbits[sigword(sig)] & bitmask(sig)) != 0);
68 }
69
70 int
sigfillset(sigset_t * set)71 sigfillset(sigset_t *set)
72 {
73 if (!sigsinit) {
74 (void) __sigfillset(&sigs);
75 sigsinit++;
76 }
77
78 *set = sigs;
79 return (0);
80 }
81
82 int
sigemptyset(sigset_t * set)83 sigemptyset(sigset_t *set)
84 {
85 set->__sigbits[0] = 0;
86 set->__sigbits[1] = 0;
87 set->__sigbits[2] = 0;
88 set->__sigbits[3] = 0;
89 return (0);
90 }
91
92 int
sigaddset(sigset_t * set,int sig)93 sigaddset(sigset_t *set, int sig)
94 {
95 if (!sigvalid(sig)) {
96 errno = EINVAL;
97 return (-1);
98 }
99 set->__sigbits[sigword(sig)] |= bitmask(sig);
100 return (0);
101 }
102
103 int
sigdelset(sigset_t * set,int sig)104 sigdelset(sigset_t *set, int sig)
105 {
106 if (!sigvalid(sig)) {
107 errno = EINVAL;
108 return (-1);
109 }
110 set->__sigbits[sigword(sig)] &= ~bitmask(sig);
111 return (0);
112 }
113
114 int
sigismember(const sigset_t * set,int sig)115 sigismember(const sigset_t *set, int sig)
116 {
117 if (!sigvalid(sig)) {
118 errno = EINVAL;
119 return (-1);
120 }
121 return ((set->__sigbits[sigword(sig)] & bitmask(sig)) != 0);
122 }
123