blob: 74d18c0e583e6dcb71a3b677796c2bbfc262a328 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
// Copyright © Tavian Barnes <tavianator@tavianator.com>
// SPDX-License-Identifier: 0BSD
/**
* Signal hooks.
*/
#ifndef BFS_SIGHOOK_H
#define BFS_SIGHOOK_H
#include <signal.h>
/**
* A dynamic signal hook.
*/
struct sighook;
/**
* Signal hook flags.
*/
enum sigflags {
/** Suppress the default action for this signal. */
SH_CONTINUE = 1 << 0,
};
/**
* A signal hook callback. Hooks are executed from a signal handler, so must
* only call async-signal-safe functions.
*
* @param sig
* The signal number.
* @param info
* Additional information about the signal.
* @param arg
* An arbitrary pointer passed to the hook.
*/
typedef void sighook_fn(int sig, siginfo_t *info, void *arg);
/**
* Install a hook for a signal.
*
* @param sig
* The signal to hook.
* @param fn
* The function to call.
* @param arg
* An argument passed to the function.
* @param flags
* Flags for the new hook.
* @return
* The installed hook, or NULL on failure.
*/
struct sighook *sighook(int sig, sighook_fn *fn, void *arg, enum sigflags flags);
/**
* On a best-effort basis, invoke the given hook just before the program is
* abnormally terminated by a signal.
*
* @param fn
* The function to call.
* @param arg
* An argument passed to the function.
* @return
* The installed hook, or NULL on failure.
*/
struct sighook *atsigexit(sighook_fn *fn, void *arg);
/**
* Remove a signal hook.
*/
void sigunhook(struct sighook *hook);
#endif // BFS_SIGHOOK_H
|
