1/* The proper definitions for Linux/MIPS's sigaction.
 2   Copyright (C) 1993-2025 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 _BITS_SIGACTION_H
20#define _BITS_SIGACTION_H 1
21
22#ifndef _SIGNAL_H
23# error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
24#endif
25
26/* Structure describing the action to be taken when a signal arrives.  */
27struct sigaction
28  {
29    /* Special flags.  */
30    int sa_flags;
31
32    /* Signal handler.  */
33#if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
34    union
35      {
36	/* Used if SA_SIGINFO is not set.  */
37	__sighandler_t sa_handler;
38	/* Used if SA_SIGINFO is set.  */
39	void (*sa_sigaction) (int, siginfo_t *, void *);
40      }
41    __sigaction_handler;
42# define sa_handler    __sigaction_handler.sa_handler
43# define sa_sigaction  __sigaction_handler.sa_sigaction
44#else
45    __sighandler_t sa_handler;
46#endif
47    /* Additional set of signals to be blocked.  */
48    __sigset_t sa_mask;
49
50    /* The ABI says here are two unused ints following. */
51    /* Restore handler.  */
52    void (*sa_restorer) (void);
53
54#if _MIPS_SZPTR < 64
55    int sa_resv[1];
56#endif
57  };
58
59/* Bits in `sa_flags'.  */
60/* Please note that some Linux kernels versions use different values for these
61   flags which is a bug in those kernel versions.  */
62#define SA_NOCLDSTOP  0x00000001 /* Don't send SIGCHLD when children stop.  */
63#define SA_NOCLDWAIT  0x00010000 /* Don't create zombie on child death.  */
64#define SA_SIGINFO    0x00000008 /* Invoke signal-catching function with
65				    three arguments instead of one.  */
66#if defined __USE_XOPEN_EXTENDED || defined __USE_MISC
67# define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
68#endif
69#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
70# define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
71# define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
72# define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
73				    its handler is being executed.  */
74#endif
75#ifdef __USE_MISC
76# define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
77
78/* Some aliases for the SA_ constants.  */
79# define SA_NOMASK    SA_NODEFER
80# define SA_ONESHOT   SA_RESETHAND
81# define SA_STACK     SA_ONSTACK
82#endif
83
84/* Values for the HOW argument to `sigprocmask'.  */
85#define SIG_NOP	      0		/* 0 is unused to catch errors */
86#define	SIG_BLOCK     1		/* Block signals.  */
87#define	SIG_UNBLOCK   2		/* Unblock signals.  */
88#define	SIG_SETMASK   3		/* Set the set of blocked signals.  */
89#ifdef __USE_MISC
90# define SIG_SETMASK32 256	/* Goodie from SGI for BSD compatibility:
91				   set only the low 32 bit of the sigset.  */
92#endif
93
94#endif