1 /* Copyright (C) 1997, 1998, 1999, 2000, 2002 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, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 #include <sys/syscall.h>
26 #include "kernel-features.h"
28 /* The difference here is that the sigaction structure used in the
29 kernel is not the same as we use in the libc. Therefore we must
31 #include <kernel_sigaction.h>
33 #if __ASSUME_REALTIME_SIGNALS == 0
34 /* The variable is shared between all wrappers around signal handling
35 functions which have RT equivalents. This is the definition. */
36 int __libc_missing_rt_sigs
;
38 extern int __syscall_sigaction (int, const struct old_kernel_sigaction
*__unbounded
,
39 struct old_kernel_sigaction
*__unbounded
);
41 extern int __syscall_rt_sigaction (int, const struct kernel_sigaction
*__unbounded
,
42 struct kernel_sigaction
*__unbounded
, size_t);
45 /* If ACT is not NULL, change the action for SIG to *ACT.
46 If OACT is not NULL, put the old action for SIG in *OACT. */
48 __libc_sigaction (sig
, act
, oact
)
50 const struct sigaction
*act
;
51 struct sigaction
*oact
;
53 #if __ASSUME_REALTIME_SIGNALS == 0
54 struct old_kernel_sigaction k_sigact
, k_osigact
;
58 #if defined __NR_rt_sigaction || __ASSUME_REALTIME_SIGNALS > 0
59 /* First try the RT signals. */
60 # if __ASSUME_REALTIME_SIGNALS == 0
61 if (!__libc_missing_rt_sigs
)
64 struct kernel_sigaction kact
, koact
;
65 /* Save the current error value for later. We need not do this
66 if we are guaranteed to have realtime signals. */
67 # if __ASSUME_REALTIME_SIGNALS == 0
68 int saved_errno
= errno
;
73 kact
.k_sa_handler
= act
->sa_handler
;
74 memcpy (&kact
.sa_mask
, &act
->sa_mask
, sizeof (sigset_t
));
75 kact
.sa_flags
= act
->sa_flags
;
76 # ifdef HAVE_SA_RESTORER
77 kact
.sa_restorer
= act
->sa_restorer
;
81 /* XXX The size argument hopefully will have to be changed to the
82 real size of the user-level sigset_t. */
83 result
= INLINE_SYSCALL (rt_sigaction
, 4, sig
,
84 act
? __ptrvalue (&kact
) : NULL
,
85 oact
? __ptrvalue (&koact
) : NULL
, _NSIG
/ 8);
87 # if __ASSUME_REALTIME_SIGNALS == 0
88 if (result
>= 0 || errno
!= ENOSYS
)
91 if (oact
&& result
>= 0)
93 oact
->sa_handler
= koact
.k_sa_handler
;
94 memcpy (&oact
->sa_mask
, &koact
.sa_mask
, sizeof (sigset_t
));
95 oact
->sa_flags
= koact
.sa_flags
;
96 # ifdef HAVE_SA_RESTORER
97 oact
->sa_restorer
= koact
.sa_restorer
;
103 # if __ASSUME_REALTIME_SIGNALS == 0
104 __set_errno (saved_errno
);
105 __libc_missing_rt_sigs
= 1;
110 #if __ASSUME_REALTIME_SIGNALS == 0
113 k_sigact
.k_sa_handler
= act
->sa_handler
;
114 k_sigact
.sa_mask
= act
->sa_mask
.__val
[0];
115 k_sigact
.sa_flags
= act
->sa_flags
;
116 # ifdef HAVE_SA_RESTORER
117 k_sigact
.sa_restorer
= act
->sa_restorer
;
120 result
= INLINE_SYSCALL (sigaction
, 3, sig
,
121 act
? __ptrvalue (&k_sigact
) : NULL
,
122 oact
? __ptrvalue (&k_osigact
) : NULL
);
123 if (oact
&& result
>= 0)
125 oact
->sa_handler
= k_osigact
.k_sa_handler
;
126 oact
->sa_mask
.__val
[0] = k_osigact
.sa_mask
;
127 oact
->sa_flags
= k_osigact
.sa_flags
;
128 # ifdef HAVE_SA_RESTORER
129 oact
->sa_restorer
= k_osigact
.sa_restorer
;
137 weak_alias (__libc_sigaction
, __sigaction
)
138 libc_hidden_weak (__sigaction
)
139 weak_alias (__libc_sigaction
, sigaction
)
142 __sigaction (sig
, act
, oact
)
144 const struct sigaction
*act
;
145 struct sigaction
*oact
;
147 if (sig
== SIGCANCEL
)
149 __set_errno (EINVAL
);
153 return __libc_sigaction (sig
, act
, oact
);
155 libc_hidden_weak (__sigaction
)
156 weak_alias (__sigaction
, sigaction
)