1 /* Copyright (C) 1997,1998,1999,2000,2002,2003 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/>.
18 Totally hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
24 #include <sys/syscall.h>
25 #include <bits/kernel_sigaction.h>
27 #define SA_RESTORER 0x04000000
28 extern void __default_sa_restorer(void);
29 extern void __default_rt_sa_restorer(void);
31 /* When RT signals are in use we need to use a different return stub. */
32 #ifdef __NR_rt_sigreturn
33 #define choose_restorer(flags) \
34 (flags & SA_SIGINFO) ? __default_rt_sa_restorer \
35 : __default_sa_restorer
37 #define choose_restorer(flags) \
42 #ifdef __NR_rt_sigaction
44 /* If ACT is not NULL, change the action for SIG to *ACT.
45 If OACT is not NULL, put the old action for SIG in *OACT. */
46 int __libc_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
48 struct sigaction kact;
49 if (act && !(act->sa_flags & SA_RESTORER)) {
50 memcpy(&kact, act, sizeof(kact));
51 kact.sa_restorer = choose_restorer(kact.sa_flags);
52 kact.sa_flags |= SA_RESTORER;
55 /* NB: kernel (as of 2.6.25) will return EINVAL
56 * if sizeof(act->sa_mask) does not match kernel's sizeof(sigset_t) */
57 return __syscall_rt_sigaction(sig, act, oact, sizeof(act->sa_mask));
62 /* If ACT is not NULL, change the action for SIG to *ACT.
63 If OACT is not NULL, put the old action for SIG in *OACT. */
64 int __libc_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
67 struct old_kernel_sigaction kact, koact;
70 kact.k_sa_handler = act->sa_handler;
71 kact.sa_mask = act->sa_mask.__val[0];
72 kact.sa_flags = act->sa_flags;
73 if (kact.sa_flags & SA_RESTORER) {
74 kact.sa_restorer = act->sa_restorer;
76 kact.sa_restorer = choose_restorer(kact.sa_flags);
77 kact.sa_flags |= SA_RESTORER;
80 result = __syscall_sigaction(sig,
82 oact ? &koact : NULL);
83 if (oact && result >= 0) {
84 oact->sa_handler = koact.k_sa_handler;
85 oact->sa_mask.__val[0] = koact.sa_mask;
86 oact->sa_flags = koact.sa_flags;
87 oact->sa_restorer = koact.sa_restorer;
95 #ifndef LIBC_SIGACTION
96 # ifndef __UCLIBC_HAS_THREADS__
97 strong_alias(__libc_sigaction,sigaction)
98 libc_hidden_def(sigaction)
100 weak_alias(__libc_sigaction,sigaction)
101 libc_hidden_weak(sigaction)