1 /* Copyright (C) 1997-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library. If not, see
16 <http://www.gnu.org/licenses/>. */
23 #include <sys/syscall.h>
25 /* The difference here is that the sigaction structure used in the
26 kernel is not the same as we use in the libc. Therefore we must
28 #include <kernel_sigaction.h>
30 #define SA_RESTORER 0x04000000
32 extern void __default_sa_restorer (void);
33 extern void __default_rt_sa_restorer (void);
35 /* When RT signals are in use we need to use a different return stub. */
36 #define choose_restorer(flags) \
37 (flags & SA_SIGINFO) ? __default_rt_sa_restorer \
38 : __default_sa_restorer
40 /* If ACT is not NULL, change the action for SIG to *ACT.
41 If OACT is not NULL, put the old action for SIG in *OACT. */
43 __libc_sigaction (sig
, act
, oact
)
45 const struct sigaction
*act
;
46 struct sigaction
*oact
;
50 struct kernel_sigaction kact
, koact
;
54 kact
.k_sa_handler
= act
->sa_handler
;
55 memcpy (&kact
.sa_mask
, &act
->sa_mask
, sizeof (sigset_t
));
56 kact
.sa_flags
= act
->sa_flags
;
57 #ifdef HAVE_SA_RESTORER
58 if (kact
.sa_flags
& SA_RESTORER
)
59 kact
.sa_restorer
= act
->sa_restorer
;
62 kact
.sa_restorer
= choose_restorer (kact
.sa_flags
);
63 kact
.sa_flags
|= SA_RESTORER
;
68 /* XXX The size argument hopefully will have to be changed to the
69 real size of the user-level sigset_t. */
70 result
= INLINE_SYSCALL (rt_sigaction
, 4, sig
,
72 oact
? &koact
: NULL
, _NSIG
/ 8);
74 if (oact
&& result
>= 0)
76 oact
->sa_handler
= koact
.k_sa_handler
;
77 memcpy (&oact
->sa_mask
, &koact
.sa_mask
, sizeof (sigset_t
));
78 oact
->sa_flags
= koact
.sa_flags
;
79 #ifdef HAVE_SA_RESTORER
80 oact
->sa_restorer
= koact
.sa_restorer
;
85 libc_hidden_def (__libc_sigaction
)
87 #include <nptl/sigaction.c>