1 /* sigset.c - signal set manipulation functions */
2
3 /* Copyright 2002, Red Hat Inc. */
4
5 /* Note: these are currently grouped together in one file so that
6 it will override the default version in the libc/unix
7 directory which has grouped all functions in one file. */
8
9 /* sigaddset function */
10
11 #include <signal.h>
12 #include <bits/sigset.h>
13 #include <errno.h>
14 #include <string.h>
15 #include <machine/weakalias.h>
16
17 int
sigaddset(sigset_t * set,const int signo)18 sigaddset (sigset_t *set, const int signo)
19 {
20 int index, mask;
21 __sigset_t *st = (__sigset_t *)set;
22
23 if (signo > NSIG)
24 {
25 errno = EINVAL;
26 return -1;
27 }
28
29 index = (signo - 1) / (8 * sizeof(long));
30 mask = 1 << ((signo - 1) % (8 * sizeof(long)));
31
32 st->__val[index] |= mask;
33 return 0;
34 }
35
36 /* sigdelset function */
37
38 int
sigdelset(sigset_t * set,const int signo)39 sigdelset (sigset_t *set, const int signo)
40 {
41 int index, mask;
42 __sigset_t *st = (__sigset_t *)set;
43
44 if (signo > NSIG)
45 {
46 errno = EINVAL;
47 return -1;
48 }
49
50 index = (signo - 1) / (8 * sizeof(long));
51 mask = 1 << ((signo - 1) % (8 * sizeof(long)));
52
53 st->__val[index] &= ~mask;
54 return 0;
55 }
56
57 /* sigemptyset function */
58
59 int
sigemptyset(sigset_t * set)60 sigemptyset (sigset_t *set)
61 {
62 int size = NSIG / 8;
63 __sigset_t *st = (__sigset_t *)set;
64 memset (st->__val, 0, size);
65 return 0;
66 }
67
68 /* sigfillset function */
69
70 int
sigfillset(sigset_t * set)71 sigfillset (sigset_t *set)
72 {
73 int size = NSIG / 8;
74 __sigset_t *st = (__sigset_t *)set;
75 memset (st->__val, 0xff, size);
76 return 0;
77 }
78
79 /* sigismember function */
80
81 int
sigismember(const sigset_t * set,int signo)82 sigismember (const sigset_t *set, int signo)
83 {
84 int index, mask;
85 __sigset_t *st = (__sigset_t *)set;
86
87 if (signo > NSIG)
88 {
89 errno = EINVAL;
90 return -1;
91 }
92
93 index = (signo - 1) / (8 * sizeof(long));
94 mask = 1 << ((signo - 1) % (8 * sizeof(long)));
95
96 return (st->__val[index] & mask) != 0;
97 }
98
99