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1 | /* sig.h -- header file for signal handler definitions. */ |
2 | ||
74091dd4 | 3 | /* Copyright (C) 1994-2021 Free Software Foundation, Inc. |
ccc6cda3 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
3185942a JA |
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. | |
ccc6cda3 | 11 | |
3185942a JA |
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. | |
ccc6cda3 | 16 | |
3185942a JA |
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 | */ | |
ccc6cda3 JA |
20 | |
21 | /* Make sure that this is included *after* config.h! */ | |
22 | ||
23 | #if !defined (_SIG_H_) | |
24 | # define _SIG_H_ | |
25 | ||
26 | #include "stdc.h" | |
27 | ||
a0c0a00f | 28 | #include <signal.h> /* for sig_atomic_t */ |
ac50fbac | 29 | |
ccc6cda3 JA |
30 | #if !defined (SIGABRT) && defined (SIGIOT) |
31 | # define SIGABRT SIGIOT | |
32 | #endif | |
33 | ||
74091dd4 CR |
34 | #define sighandler void |
35 | typedef void SigHandler PARAMS((int)); | |
ccc6cda3 | 36 | |
74091dd4 | 37 | #define SIGRETURN(n) return |
ccc6cda3 JA |
38 | |
39 | /* Here is a definition for set_signal_handler () which simply expands to | |
40 | a call to signal () for non-Posix systems. The code for set_signal_handler | |
41 | in the Posix case resides in general.c. */ | |
42 | #if !defined (HAVE_POSIX_SIGNALS) | |
43 | # define set_signal_handler(sig, handler) (SigHandler *)signal (sig, handler) | |
44 | #else | |
8868edaf | 45 | extern SigHandler *set_signal_handler PARAMS((int, SigHandler *)); /* in sig.c */ |
ccc6cda3 JA |
46 | #endif /* _POSIX_VERSION */ |
47 | ||
ccc6cda3 JA |
48 | #if !defined (SIGCHLD) && defined (SIGCLD) |
49 | # define SIGCHLD SIGCLD | |
50 | #endif | |
51 | ||
52 | #if !defined (HAVE_POSIX_SIGNALS) && !defined (sigmask) | |
53 | # define sigmask(x) (1 << ((x)-1)) | |
54 | #endif /* !HAVE_POSIX_SIGNALS && !sigmask */ | |
55 | ||
56 | #if !defined (HAVE_POSIX_SIGNALS) | |
57 | # if !defined (SIG_BLOCK) | |
58 | # define SIG_BLOCK 2 | |
59 | # define SIG_SETMASK 3 | |
60 | # endif /* SIG_BLOCK */ | |
61 | ||
62 | /* sigset_t defined in config.h */ | |
63 | ||
64 | /* Make sure there is nothing inside the signal set. */ | |
65 | # define sigemptyset(set) (*(set) = 0) | |
66 | ||
67 | /* Initialize the signal set to hold all signals. */ | |
68 | # define sigfillset(set) (*set) = sigmask (NSIG) - 1 | |
69 | ||
70 | /* Add SIG to the contents of SET. */ | |
71 | # define sigaddset(set, sig) *(set) |= sigmask (sig) | |
72 | ||
73 | /* Delete SIG from signal set SET. */ | |
74 | # define sigdelset(set, sig) *(set) &= ~sigmask (sig) | |
75 | ||
76 | /* Is SIG a member of the signal set SET? */ | |
77 | # define sigismember(set, sig) ((*(set) & sigmask (sig)) != 0) | |
78 | ||
79 | /* Suspend the process until the reception of one of the signals | |
80 | not present in SET. */ | |
81 | # define sigsuspend(set) sigpause (*(set)) | |
82 | #endif /* !HAVE_POSIX_SIGNALS */ | |
83 | ||
84 | /* These definitions are used both in POSIX and non-POSIX implementations. */ | |
85 | ||
86 | #define BLOCK_SIGNAL(sig, nvar, ovar) \ | |
7117c2d2 | 87 | do { \ |
ccc6cda3 JA |
88 | sigemptyset (&nvar); \ |
89 | sigaddset (&nvar, sig); \ | |
90 | sigemptyset (&ovar); \ | |
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91 | sigprocmask (SIG_BLOCK, &nvar, &ovar); \ |
92 | } while (0) | |
ccc6cda3 | 93 | |
ac50fbac CR |
94 | #define UNBLOCK_SIGNAL(ovar) sigprocmask (SIG_SETMASK, &ovar, (sigset_t *) NULL) |
95 | ||
ccc6cda3 | 96 | #if defined (HAVE_POSIX_SIGNALS) |
ac50fbac CR |
97 | # define BLOCK_CHILD(nvar, ovar) BLOCK_SIGNAL (SIGCHLD, nvar, ovar) |
98 | # define UNBLOCK_CHILD(ovar) UNBLOCK_SIGNAL(ovar) | |
ccc6cda3 JA |
99 | #else /* !HAVE_POSIX_SIGNALS */ |
100 | # define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD)) | |
101 | # define UNBLOCK_CHILD(ovar) sigsetmask (ovar) | |
102 | #endif /* !HAVE_POSIX_SIGNALS */ | |
103 | ||
95732b49 | 104 | /* Extern variables */ |
ac50fbac CR |
105 | extern volatile sig_atomic_t sigwinch_received; |
106 | extern volatile sig_atomic_t sigterm_received; | |
95732b49 | 107 | |
ac50fbac | 108 | extern int interrupt_immediately; /* no longer used */ |
0628567a JA |
109 | extern int terminate_immediately; |
110 | ||
ccc6cda3 | 111 | /* Functions from sig.c. */ |
8868edaf CR |
112 | extern sighandler termsig_sighandler PARAMS((int)); |
113 | extern void termsig_handler PARAMS((int)); | |
114 | extern sighandler sigint_sighandler PARAMS((int)); | |
115 | extern void initialize_signals PARAMS((int)); | |
116 | extern void initialize_terminating_signals PARAMS((void)); | |
117 | extern void reset_terminating_signals PARAMS((void)); | |
118 | extern void top_level_cleanup PARAMS((void)); | |
119 | extern void throw_to_top_level PARAMS((void)); | |
120 | extern void jump_to_top_level PARAMS((int)) __attribute__((__noreturn__)); | |
121 | extern void restore_sigmask PARAMS((void)); | |
122 | ||
123 | extern sighandler sigwinch_sighandler PARAMS((int)); | |
124 | extern void set_sigwinch_handler PARAMS((void)); | |
125 | extern void unset_sigwinch_handler PARAMS((void)); | |
126 | ||
127 | extern sighandler sigterm_sighandler PARAMS((int)); | |
ac50fbac | 128 | |
ccc6cda3 | 129 | /* Functions defined in trap.c. */ |
8868edaf CR |
130 | extern SigHandler *set_sigint_handler PARAMS((void)); |
131 | extern SigHandler *trap_to_sighandler PARAMS((int)); | |
132 | extern sighandler trap_handler PARAMS((int)); | |
ccc6cda3 | 133 | |
8868edaf CR |
134 | extern int block_trapped_signals PARAMS((sigset_t *, sigset_t *)); |
135 | extern int unblock_trapped_signals PARAMS((sigset_t *)); | |
ccc6cda3 | 136 | #endif /* _SIG_H_ */ |