1 /* __sigset_t manipulators.  Generic/BSD version.
2    Copyright (C) 1991-2022 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, see
17    <https://www.gnu.org/licenses/>.  */
18 
19 #ifndef _SIGSETOPS_H
20 #define _SIGSETOPS_H 1
21 
22 #include <signal.h>
23 
24 /* Return a mask that includes SIG only.  The cast to `sigset_t' avoids
25    overflow if `sigset_t' is wider than `int'.  */
26 # define __sigmask(sig) (((__sigset_t) 1) << ((sig) - 1))
27 
28 #define __sigemptyset(set)			\
29   (__extension__ ({				\
30     *(set) = (__sigset_t) 0;			\
31     0;						\
32   }))
33 #define __sigfillset(set)			\
34   (__extension__ ({				\
35     *(set) = ~(__sigset_t) 0;			\
36     0;						\
37   }))
38 
39 # define __sigisemptyset(set)			\
40   (*(set) == (__sigset_t) 0)
41 
42 # define __sigandset(dest, left, right)		\
43   (__extension__ ({				\
44     *(dest) = *(left) & *(right);		\
45     0;						\
46   }))
47 
48 # define __sigorset(dest, left, right)		\
49   (__extension__ ({				\
50     *(dest) = *(left) | *(right);		\
51     0;						\
52   }))
53 
54 /* These macros needn't check for a bogus signal number;
55    checking is done in the non-__ versions.  */
56 # define __sigismember(set, sig)		\
57   (__extension__ ({				\
58     __sigset_t __mask = __sigmask (sig);	\
59     *(set) & __mask ? 1 : 0;			\
60   }))
61 
62 # define __sigaddset(set, sig)			\
63   (__extension__ ({				\
64     __sigset_t __mask = __sigmask (sig);	\
65     *(set) |= __mask;				\
66     0;						\
67   }))
68 
69 # define __sigdelset(set, sig)			\
70   (__extension__ ({				\
71     __sigset_t __mask = __sigmask (sig);	\
72     *(set) &= ~__mask;				\
73     0;						\
74   }))
75 
76 #endif
77