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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/* sig.h -- header file for signal handler definitions. */
/* Copyright (C) 1994-2013 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
/* Make sure that this is included *after* config.h! */
#if !defined (_SIG_H_)
# define _SIG_H_
#include "stdc.h"
#include <signal.h> /* for sig_atomic_t */
#if !defined (SIGABRT) && defined (SIGIOT)
# define SIGABRT SIGIOT
#endif
#define sighandler RETSIGTYPE
typedef RETSIGTYPE SigHandler PARAMS((int));
#if defined (VOID_SIGHANDLER)
# define SIGRETURN(n) return
#else
# define SIGRETURN(n) return(n)
#endif /* !VOID_SIGHANDLER */
/* Here is a definition for set_signal_handler () which simply expands to
a call to signal () for non-Posix systems. The code for set_signal_handler
in the Posix case resides in general.c. */
#if !defined (HAVE_POSIX_SIGNALS)
# define set_signal_handler(sig, handler) (SigHandler *)signal (sig, handler)
#else
extern SigHandler *set_signal_handler PARAMS((int, SigHandler *)); /* in sig.c */
#endif /* _POSIX_VERSION */
#if !defined (SIGCHLD) && defined (SIGCLD)
# define SIGCHLD SIGCLD
#endif
#if !defined (HAVE_POSIX_SIGNALS) && !defined (sigmask)
# define sigmask(x) (1 << ((x)-1))
#endif /* !HAVE_POSIX_SIGNALS && !sigmask */
#if !defined (HAVE_POSIX_SIGNALS)
# if !defined (SIG_BLOCK)
# define SIG_BLOCK 2
# define SIG_SETMASK 3
# endif /* SIG_BLOCK */
/* sigset_t defined in config.h */
/* Make sure there is nothing inside the signal set. */
# define sigemptyset(set) (*(set) = 0)
/* Initialize the signal set to hold all signals. */
# define sigfillset(set) (*set) = sigmask (NSIG) - 1
/* Add SIG to the contents of SET. */
# define sigaddset(set, sig) *(set) |= sigmask (sig)
/* Delete SIG from signal set SET. */
# define sigdelset(set, sig) *(set) &= ~sigmask (sig)
/* Is SIG a member of the signal set SET? */
# define sigismember(set, sig) ((*(set) & sigmask (sig)) != 0)
/* Suspend the process until the reception of one of the signals
not present in SET. */
# define sigsuspend(set) sigpause (*(set))
#endif /* !HAVE_POSIX_SIGNALS */
/* These definitions are used both in POSIX and non-POSIX implementations. */
#define BLOCK_SIGNAL(sig, nvar, ovar) \
do { \
sigemptyset (&nvar); \
sigaddset (&nvar, sig); \
sigemptyset (&ovar); \
sigprocmask (SIG_BLOCK, &nvar, &ovar); \
} while (0)
#define UNBLOCK_SIGNAL(ovar) sigprocmask (SIG_SETMASK, &ovar, (sigset_t *) NULL)
#if defined (HAVE_POSIX_SIGNALS)
# define BLOCK_CHILD(nvar, ovar) BLOCK_SIGNAL (SIGCHLD, nvar, ovar)
# define UNBLOCK_CHILD(ovar) UNBLOCK_SIGNAL(ovar)
#else /* !HAVE_POSIX_SIGNALS */
# define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD))
# define UNBLOCK_CHILD(ovar) sigsetmask (ovar)
#endif /* !HAVE_POSIX_SIGNALS */
/* Extern variables */
extern volatile sig_atomic_t sigwinch_received;
extern volatile sig_atomic_t sigterm_received;
extern int interrupt_immediately; /* no longer used */
extern int terminate_immediately;
/* Functions from sig.c. */
extern sighandler termsig_sighandler PARAMS((int));
extern void termsig_handler PARAMS((int));
extern sighandler sigint_sighandler PARAMS((int));
extern void initialize_signals PARAMS((int));
extern void initialize_terminating_signals PARAMS((void));
extern void reset_terminating_signals PARAMS((void));
extern void top_level_cleanup PARAMS((void));
extern void throw_to_top_level PARAMS((void));
extern void jump_to_top_level PARAMS((int)) __attribute__((__noreturn__));
extern void restore_sigmask PARAMS((void));
extern sighandler sigwinch_sighandler PARAMS((int));
extern void set_sigwinch_handler PARAMS((void));
extern void unset_sigwinch_handler PARAMS((void));
extern sighandler sigterm_sighandler PARAMS((int));
/* Functions defined in trap.c. */
extern SigHandler *set_sigint_handler PARAMS((void));
extern SigHandler *trap_to_sighandler PARAMS((int));
extern sighandler trap_handler PARAMS((int));
extern int block_trapped_signals PARAMS((sigset_t *, sigset_t *));
extern int unblock_trapped_signals PARAMS((sigset_t *));
#endif /* _SIG_H_ */
|
