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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/*@ S-nail - a mail user agent derived from Berkeley Mail.
*@ Signal handling and commands heavily related with signals.
*
* Copyright (c) 2012 - 2020 Steffen (Daode) Nurpmeso <steffen@sdaoden.eu>.
* SPDX-License-Identifier: ISC
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef mx_SIGS_H
#define mx_SIGS_H
#include <mx/nail.h>
/* TODO FAKE */
#define mx_HEADER
#include <su/code-in.h>
typedef void (*n_sighdl_t)(int);
/* This is somewhat temporary for pre v15 */
struct n_sigman{
u32 sm_flags; /* enum n_sigman_flags */
int sm_signo;
struct n_sigman *sm_outer;
n_sighdl_t sm_ohup;
n_sighdl_t sm_oint;
n_sighdl_t sm_oquit;
n_sighdl_t sm_oterm;
n_sighdl_t sm_opipe;
sigjmp_buf sm_jump;
};
/* `sleep' */
EXPORT int c_sleep(void *v);
/* */
EXPORT void n_raise(int signo);
/* Provide BSD-like signal() on all systems TODO v15 -> SysV -> n_signal() */
EXPORT n_sighdl_t safe_signal(int signum, n_sighdl_t handler);
/* Provide reproducible non-restartable signal handler installation */
EXPORT n_sighdl_t n_signal(int signo, n_sighdl_t hdl);
/* Block all signals except some fatal trap ones and SIGCHLD.
* sigadjust starts an optional 0 terminated list of signal adjustments:
* a positive one will be sigdelset()ted, a negative one will be added.
* Adjusts the list if already active */
EXPORT void mx_sigs_all_hold(s32 sigadjust, ...);
#define mx_sigs_all_holdx() mx_sigs_all_hold(0)
EXPORT void mx_sigs_all_rele(void);
/* Hold HUP/QUIT/INT */
EXPORT void hold_sigs(void);
EXPORT void rele_sigs(void);
/* Call _ENTER_SWITCH() with the according flags, it'll take care for the rest
* and also set the jump buffer - it returns 0 if anything went fine and
* a signal number if a jump occurred, in which case all handlers requested in
* flags are temporarily SIG_IGN.
* _cleanup_ping() informs the condome that no jumps etc. shall be performed
* until _leave() is called in the following -- to be (optionally) called right
* before the local jump label is reached which is jumped to after a long jump
* occurred, straight code flow provided, e.g., to avoid destructors to be
* called twice. _leave() must always be called last, reraise_flags will be
* used to decide how signal handling has to continue */
#define n_SIGMAN_ENTER_SWITCH(S,F) do{\
int __x__;\
hold_sigs();\
if(sigsetjmp((S)->sm_jump, 1))\
__x__ = -1;\
else\
__x__ = F;\
n__sigman_enter(S, __x__);\
}while(0); switch((S)->sm_signo)
EXPORT int n__sigman_enter(struct n_sigman *self, int flags);
EXPORT void n_sigman_cleanup_ping(struct n_sigman *self);
EXPORT void n_sigman_leave(struct n_sigman *self, enum n_sigman_flags flags);
/* Pending signal or 0? */
EXPORT int n_sigman_peek(void);
EXPORT void n_sigman_consume(void);
/* Not-Yet-Dead debug information (handler installation in main.c).
* Does not crash for SIGUSR2 */
#if su_DVLOR(1, 0)
EXPORT void mx__nyd_oncrash(int signo);
#endif
#include <su/code-ou.h>
#endif /* mx_SIGS_H */
/* s-it-mode */
|
