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1 | /* trap.h -- data structures used in the trap mechanism. */ | |
2 | ||
3 | /* Copyright (C) 1993-2013 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
7 | Bash is free software: you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | Bash is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #if !defined (_TRAP_H_) | |
22 | #define _TRAP_H_ | |
23 | ||
24 | #include "stdc.h" | |
25 | ||
26 | #if !defined (SIG_DFL) | |
27 | #include "bashtypes.h" | |
28 | #include <signal.h> | |
29 | #endif /* SIG_DFL */ | |
30 | ||
31 | #if !defined (NSIG) | |
32 | #define NSIG 64 | |
33 | #endif /* !NSIG */ | |
34 | ||
35 | #define NO_SIG -1 | |
36 | #define DEFAULT_SIG SIG_DFL | |
37 | #define IGNORE_SIG SIG_IGN | |
38 | ||
39 | /* Special shell trap names. */ | |
40 | #define DEBUG_TRAP NSIG | |
41 | #define ERROR_TRAP NSIG+1 | |
42 | #define RETURN_TRAP NSIG+2 | |
43 | #define EXIT_TRAP 0 | |
44 | ||
45 | /* system signals plus special bash traps */ | |
46 | #define BASH_NSIG NSIG+3 | |
47 | ||
48 | /* Flags values for decode_signal() */ | |
49 | #define DSIG_SIGPREFIX 0x01 /* don't allow `SIG' PREFIX */ | |
50 | #define DSIG_NOCASE 0x02 /* case-insensitive comparison */ | |
51 | ||
52 | /* A value which can never be the target of a trap handler. */ | |
53 | #define IMPOSSIBLE_TRAP_HANDLER (SigHandler *)initialize_traps | |
54 | ||
55 | #define signal_object_p(x,f) (decode_signal (x,f) != NO_SIG) | |
56 | ||
57 | #define TRAP_STRING(s) \ | |
58 | (signal_is_trapped (s) && signal_is_ignored (s) == 0) ? trap_list[s] \ | |
59 | : (char *)NULL | |
60 | ||
61 | extern char *trap_list[]; | |
62 | ||
63 | extern int trapped_signal_received; | |
64 | extern int wait_signal_received; | |
65 | extern int running_trap; | |
66 | extern int trap_saved_exit_value; | |
67 | ||
68 | /* Externally-visible functions declared in trap.c. */ | |
69 | extern void initialize_traps __P((void)); | |
70 | ||
71 | extern void run_pending_traps __P((void)); | |
72 | ||
73 | extern void queue_sigchld_trap __P((int)); | |
74 | extern void maybe_set_sigchld_trap __P((char *)); | |
75 | extern void set_impossible_sigchld_trap __P((void)); | |
76 | extern void set_sigchld_trap __P((char *)); | |
77 | ||
78 | extern void set_debug_trap __P((char *)); | |
79 | extern void set_error_trap __P((char *)); | |
80 | extern void set_return_trap __P((char *)); | |
81 | ||
82 | extern void maybe_set_debug_trap __P((char *)); | |
83 | extern void maybe_set_error_trap __P((char *)); | |
84 | extern void maybe_set_return_trap __P((char *)); | |
85 | ||
86 | extern void set_sigint_trap __P((char *)); | |
87 | extern void set_signal __P((int, char *)); | |
88 | ||
89 | extern void restore_default_signal __P((int)); | |
90 | extern void ignore_signal __P((int)); | |
91 | extern int run_exit_trap __P((void)); | |
92 | extern void run_trap_cleanup __P((int)); | |
93 | extern int run_debug_trap __P((void)); | |
94 | extern void run_error_trap __P((void)); | |
95 | extern void run_return_trap __P((void)); | |
96 | ||
97 | extern void free_trap_strings __P((void)); | |
98 | extern void reset_signal_handlers __P((void)); | |
99 | extern void restore_original_signals __P((void)); | |
100 | ||
101 | extern void get_original_signal __P((int)); | |
102 | extern void get_all_original_signals __P((void)); | |
103 | ||
104 | extern char *signal_name __P((int)); | |
105 | ||
106 | extern int decode_signal __P((char *, int)); | |
107 | extern void run_interrupt_trap __P((int)); | |
108 | extern int maybe_call_trap_handler __P((int)); | |
109 | extern int signal_is_special __P((int)); | |
110 | extern int signal_is_trapped __P((int)); | |
111 | extern int signal_is_pending __P((int)); | |
112 | extern int signal_is_ignored __P((int)); | |
113 | extern int signal_is_hard_ignored __P((int)); | |
114 | extern void set_signal_hard_ignored __P((int)); | |
115 | extern void set_signal_ignored __P((int)); | |
116 | extern int signal_in_progress __P((int)); | |
117 | ||
118 | extern int first_pending_trap __P((void)); | |
119 | extern int any_signals_trapped __P((void)); | |
120 | extern void check_signals __P((void)); | |
121 | extern void check_signals_and_traps __P((void)); | |
122 | ||
123 | #endif /* _TRAP_H_ */ |