1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef __ASM_GENERIC_SIGNAL_DEFS_H
3#define __ASM_GENERIC_SIGNAL_DEFS_H
4
5#include <linux/compiler.h>
6
7/*
8 * SA_FLAGS values:
9 *
10 * SA_NOCLDSTOP flag to turn off SIGCHLD when children stop.
11 * SA_NOCLDWAIT flag on SIGCHLD to inhibit zombies.
12 * SA_SIGINFO delivers the signal with SIGINFO structs.
13 * SA_ONSTACK indicates that a registered stack_t will be used.
14 * SA_RESTART flag to get restarting signals (which were the default long ago)
15 * SA_NODEFER prevents the current signal from being masked in the handler.
16 * SA_RESETHAND clears the handler when the signal is delivered.
17 * SA_UNSUPPORTED is a flag bit that will never be supported. Kernels from
18 * before the introduction of SA_UNSUPPORTED did not clear unknown bits from
19 * sa_flags when read using the oldact argument to sigaction and rt_sigaction,
20 * so this bit allows flag bit support to be detected from userspace while
21 * allowing an old kernel to be distinguished from a kernel that supports every
22 * flag bit.
23 * SA_EXPOSE_TAGBITS exposes an architecture-defined set of tag bits in
24 * siginfo.si_addr.
25 *
26 * SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single
27 * Unix names RESETHAND and NODEFER respectively.
28 */
29#ifndef SA_NOCLDSTOP
30#define SA_NOCLDSTOP 0x00000001
31#endif
32#ifndef SA_NOCLDWAIT
33#define SA_NOCLDWAIT 0x00000002
34#endif
35#ifndef SA_SIGINFO
36#define SA_SIGINFO 0x00000004
37#endif
38/* 0x00000008 used on alpha, mips, parisc */
39/* 0x00000010 used on alpha, parisc */
40/* 0x00000020 used on alpha, parisc, sparc */
41/* 0x00000040 used on alpha, parisc */
42/* 0x00000080 used on parisc */
43/* 0x00000100 used on sparc */
44/* 0x00000200 used on sparc */
45#define SA_UNSUPPORTED 0x00000400
46#define SA_EXPOSE_TAGBITS 0x00000800
47/* 0x00010000 used on mips */
48/* 0x00800000 used for internal SA_IMMUTABLE */
49/* 0x01000000 used on x86 */
50/* 0x02000000 used on x86 */
51/*
52 * New architectures should not define the obsolete
53 * SA_RESTORER 0x04000000
54 */
55#ifndef SA_ONSTACK
56#define SA_ONSTACK 0x08000000
57#endif
58#ifndef SA_RESTART
59#define SA_RESTART 0x10000000
60#endif
61#ifndef SA_NODEFER
62#define SA_NODEFER 0x40000000
63#endif
64#ifndef SA_RESETHAND
65#define SA_RESETHAND 0x80000000
66#endif
67
68#define SA_NOMASK SA_NODEFER
69#define SA_ONESHOT SA_RESETHAND
70
71#ifndef SIG_BLOCK
72#define SIG_BLOCK 0 /* for blocking signals */
73#endif
74#ifndef SIG_UNBLOCK
75#define SIG_UNBLOCK 1 /* for unblocking signals */
76#endif
77#ifndef SIG_SETMASK
78#define SIG_SETMASK 2 /* for setting the signal mask */
79#endif
80
81#ifndef __ASSEMBLY__
82typedef void __signalfn_t(int);
83typedef __signalfn_t __user *__sighandler_t;
84
85typedef void __restorefn_t(void);
86typedef __restorefn_t __user *__sigrestore_t;
87
88#define SIG_DFL ((__force __sighandler_t)0) /* default signal handling */
89#define SIG_IGN ((__force __sighandler_t)1) /* ignore signal */
90#define SIG_ERR ((__force __sighandler_t)-1) /* error return from signal */
91#endif
92
93#endif /* __ASM_GENERIC_SIGNAL_DEFS_H */
94