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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/* Copyright (C) 1991, 92, 94, 95, 96 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <signal.h>
#include <errno.h>
#include <stddef.h>
/* We use a wrapper handler to support SV_RESETHAND. */
static __sighandler_t wrapped_handlers[NSIG];
static sigset_t wrapped_masks[NSIG];
static void wrapper_handler __P ((int sig));
static inline int convert_mask __P ((sigset_t *set, const int mask));
static void
wrapper_handler (sig)
int sig;
{
int save;
struct sigaction act;
act.sa_handler = SIG_DFL;
act.sa_mask = wrapped_masks[sig];
act.sa_flags = 0;
save = errno;
(void) __sigaction (sig, &act, (struct sigaction *) NULL);
__set_errno (save);
(*wrapped_handlers[sig]) (sig);
}
static inline int
convert_mask (set, mask)
sigset_t *set;
const int mask;
{
register int sig;
if (sizeof (*set) == sizeof (mask))
*(int *) set = mask;
else if (sizeof (*set) == sizeof (unsigned long int))
*(unsigned long int *) set = (unsigned int) mask;
else
{
if (__sigemptyset (set) < 0)
return -1;
for (sig = 1; sig < NSIG; ++sig)
if ((mask & sigmask (sig)) && __sigaddset (set, sig) < 0)
return -1;
}
return 0;
}
/* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
of VEC. The signals in `sv_mask' will be blocked while the handler runs.
If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
it is filled in with the old information for SIG. */
int
__sigvec (sig, vec, ovec)
int sig;
const struct sigvec *vec;
struct sigvec *ovec;
{
struct sigaction old;
if (vec == NULL || !(vec->sv_flags & SV_RESETHAND))
{
struct sigaction new, *n;
if (vec == NULL)
n = NULL;
else
{
n = &new;
n->sa_handler = vec->sv_handler;
if (convert_mask (&n->sa_mask, vec->sv_mask) < 0)
return -1;
n->sa_flags = 0;
if (vec->sv_flags & SV_ONSTACK)
{
#ifdef SA_ONSTACK
n->sa_flags |= SA_ONSTACK;
#else
__set_errno (ENOSYS);
return -1;
#endif
}
#ifdef SA_RESTART
if (!(vec->sv_flags & SV_INTERRUPT))
n->sa_flags |= SA_RESTART;
#endif
}
if (__sigaction (sig, n, &old) < 0)
return -1;
}
else
{
struct sigaction wrapper;
wrapper.sa_handler = wrapper_handler;
wrapped_handlers[sig] = vec->sv_handler;
if (convert_mask (&wrapped_masks[sig], vec->sv_mask) < 0)
return -1;
if (__sigaction (sig, &wrapper, &old) < 0)
return -1;
}
if (ovec != NULL)
{
register int i;
int mask = 0;
if (sizeof (int) == sizeof (sigset_t))
mask = *(int *) &old.sa_mask;
else if (sizeof (unsigned long int) == sizeof (sigset_t))
mask = *(unsigned long int *) &old.sa_mask;
else
for (i = 1; i < NSIG; ++i)
if (__sigismember(&old.sa_mask, i))
mask |= sigmask(i);
ovec->sv_mask = mask;
ovec->sv_flags = 0;
#ifdef SA_ONSTACK
if (old.sa_flags & SA_ONSTACK)
ovec->sv_flags |= SV_ONSTACK;
#endif
#ifdef SA_RESTART
if (!(old.sa_flags & SA_RESTART))
#endif
ovec->sv_flags |= SV_INTERRUPT;
if (old.sa_handler == wrapper_handler)
{
ovec->sv_flags |= SV_RESETHAND;
ovec->sv_handler = wrapped_handlers[sig];
}
else
ovec->sv_handler = old.sa_handler;
}
return 0;
}
weak_alias (__sigvec, sigvec)
|
