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
|
/* Copyright (C) 1997,1998,1999,2000,2002,2003 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.
Totally hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
*/
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <sys/syscall.h>
#include <bits/kernel_sigaction.h>
#define SA_RESTORER 0x04000000
extern void __default_sa_restorer(void);
extern void __default_rt_sa_restorer(void);
/* When RT signals are in use we need to use a different return stub. */
#ifdef __NR_rt_sigreturn
#define choose_restorer(flags) \
(flags & SA_SIGINFO) ? __default_rt_sa_restorer \
: __default_sa_restorer
#else
#define choose_restorer(flags) \
__default_sa_restorer
#endif
#ifdef __NR_rt_sigaction
/* If ACT is not NULL, change the action for SIG to *ACT.
If OACT is not NULL, put the old action for SIG in *OACT. */
int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
{
int result;
struct kernel_sigaction kact, koact;
if (act) {
kact.k_sa_handler = act->sa_handler;
__memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
kact.sa_flags = act->sa_flags;
# ifdef HAVE_SA_RESTORER
/* If the user specified SA_ONSTACK this means she is trying to
use the old-style stack switching. Unfortunately this
requires the sa_restorer field so we cannot install our own
handler. (In fact the user is likely to be out of luck anyway
since the kernel currently only supports stack switching via
the X/Open sigaltstack interface, but we allow for the
possibility that this might change in the future.) */
if (kact.sa_flags & (SA_RESTORER | SA_ONSTACK)) {
kact.sa_restorer = act->sa_restorer;
} else {
kact.sa_restorer = choose_restorer (kact.sa_flags);
kact.sa_flags |= SA_RESTORER;
}
# endif
}
/* XXX The size argument hopefully will have to be changed to the
real size of the user-level sigset_t. */
result = __syscall_rt_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
oact ? __ptrvalue (&koact) : NULL, _NSIG / 8);
if (oact && result >= 0) {
oact->sa_handler = koact.k_sa_handler;
__memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
oact->sa_flags = koact.sa_flags;
# ifdef HAVE_SA_RESTORER
oact->sa_restorer = koact.sa_restorer;
# endif
}
return result;
}
#else
/* If ACT is not NULL, change the action for SIG to *ACT.
If OACT is not NULL, put the old action for SIG in *OACT. */
int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
{
int result;
struct old_kernel_sigaction kact, koact;
if (act) {
kact.k_sa_handler = act->sa_handler;
kact.sa_mask = act->sa_mask.__val[0];
kact.sa_flags = act->sa_flags;
# ifdef HAVE_SA_RESTORER
/* See the comments above for why we test SA_ONSTACK. */
if (kact.sa_flags & (SA_RESTORER | SA_ONSTACK)) {
kact.sa_restorer = act->sa_restorer;
} else {
kact.sa_restorer = choose_restorer (kact.sa_flags);
kact.sa_flags |= SA_RESTORER;
}
# endif
}
result = __syscall_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
oact ? __ptrvalue (&koact) : NULL);
if (oact && result >= 0) {
oact->sa_handler = koact.k_sa_handler;
oact->sa_mask.__val[0] = koact.sa_mask;
oact->sa_flags = koact.sa_flags;
# ifdef HAVE_SA_RESTORER
oact->sa_restorer = koact.sa_restorer;
# endif
}
return result;
}
#endif
hidden_weak_alias(__libc_sigaction,__sigaction)
weak_alias(__libc_sigaction,sigaction)
|
