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1 | /* sig.h -- header file for signal handler definitions. */ |
2 | ||
3 | /* Copyright (C) 1994 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 it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
11 | ||
12 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License along | |
18 | with Bash; see the file COPYING. If not, write to the Free Software | |
19 | Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
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 | ||
28 | #if !defined (SIGABRT) && defined (SIGIOT) | |
29 | # define SIGABRT SIGIOT | |
30 | #endif | |
31 | ||
32 | #define sighandler RETSIGTYPE | |
33 | typedef RETSIGTYPE SigHandler (); | |
34 | ||
35 | #if defined (VOID_SIGHANDLER) | |
36 | # define SIGRETURN(n) return | |
37 | #else | |
38 | # define SIGRETURN(n) return(n) | |
39 | #endif /* !VOID_SIGHANDLER */ | |
40 | ||
41 | /* Here is a definition for set_signal_handler () which simply expands to | |
42 | a call to signal () for non-Posix systems. The code for set_signal_handler | |
43 | in the Posix case resides in general.c. */ | |
44 | #if !defined (HAVE_POSIX_SIGNALS) | |
45 | # define set_signal_handler(sig, handler) (SigHandler *)signal (sig, handler) | |
46 | #else | |
47 | extern SigHandler *set_signal_handler (); /* in sig.c */ | |
48 | #endif /* _POSIX_VERSION */ | |
49 | ||
50 | /* Definitions used by the job control code. */ | |
51 | #if defined (JOB_CONTROL) | |
52 | ||
53 | #if !defined (SIGCHLD) && defined (SIGCLD) | |
54 | # define SIGCHLD SIGCLD | |
55 | #endif | |
56 | ||
57 | #if !defined (HAVE_POSIX_SIGNALS) && !defined (sigmask) | |
58 | # define sigmask(x) (1 << ((x)-1)) | |
59 | #endif /* !HAVE_POSIX_SIGNALS && !sigmask */ | |
60 | ||
61 | #if !defined (HAVE_POSIX_SIGNALS) | |
62 | # if !defined (SIG_BLOCK) | |
63 | # define SIG_BLOCK 2 | |
64 | # define SIG_SETMASK 3 | |
65 | # endif /* SIG_BLOCK */ | |
66 | ||
67 | /* sigset_t defined in config.h */ | |
68 | ||
69 | /* Make sure there is nothing inside the signal set. */ | |
70 | # define sigemptyset(set) (*(set) = 0) | |
71 | ||
72 | /* Initialize the signal set to hold all signals. */ | |
73 | # define sigfillset(set) (*set) = sigmask (NSIG) - 1 | |
74 | ||
75 | /* Add SIG to the contents of SET. */ | |
76 | # define sigaddset(set, sig) *(set) |= sigmask (sig) | |
77 | ||
78 | /* Delete SIG from signal set SET. */ | |
79 | # define sigdelset(set, sig) *(set) &= ~sigmask (sig) | |
80 | ||
81 | /* Is SIG a member of the signal set SET? */ | |
82 | # define sigismember(set, sig) ((*(set) & sigmask (sig)) != 0) | |
83 | ||
84 | /* Suspend the process until the reception of one of the signals | |
85 | not present in SET. */ | |
86 | # define sigsuspend(set) sigpause (*(set)) | |
87 | #endif /* !HAVE_POSIX_SIGNALS */ | |
88 | ||
89 | /* These definitions are used both in POSIX and non-POSIX implementations. */ | |
90 | ||
91 | #define BLOCK_SIGNAL(sig, nvar, ovar) \ | |
92 | sigemptyset (&nvar); \ | |
93 | sigaddset (&nvar, sig); \ | |
94 | sigemptyset (&ovar); \ | |
95 | sigprocmask (SIG_BLOCK, &nvar, &ovar) | |
96 | ||
97 | #if defined (HAVE_POSIX_SIGNALS) | |
98 | # define BLOCK_CHILD(nvar, ovar) \ | |
99 | BLOCK_SIGNAL (SIGCHLD, nvar, ovar) | |
100 | # define UNBLOCK_CHILD(ovar) \ | |
101 | sigprocmask (SIG_SETMASK, &ovar, (sigset_t *) NULL) | |
102 | #else /* !HAVE_POSIX_SIGNALS */ | |
103 | # define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD)) | |
104 | # define UNBLOCK_CHILD(ovar) sigsetmask (ovar) | |
105 | #endif /* !HAVE_POSIX_SIGNALS */ | |
106 | ||
107 | #endif /* JOB_CONTROL */ | |
108 | ||
109 | /* Functions from sig.c. */ | |
110 | extern sighandler termination_unwind_protect __P((int)); | |
111 | extern sighandler sigint_sighandler __P((int)); | |
112 | extern void initialize_signals __P((void)); | |
113 | extern void reinitialize_signals __P((void)); | |
114 | extern void reset_terminating_signals __P((void)); | |
115 | extern void throw_to_top_level __P((void)); | |
116 | extern void jump_to_top_level __P((int)); | |
117 | ||
118 | /* Functions defined in trap.c. */ | |
119 | extern SigHandler *set_sigint_handler __P((void)); | |
120 | ||
121 | #endif /* _SIG_H_ */ |