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, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 Totally hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
25 #include <sys/syscall.h>
26 #include <bits/kernel_sigaction.h>
28 #define SA_RESTORER 0x04000000
29 extern void __default_sa_restorer(void);
30 extern void __default_rt_sa_restorer(void);
32 /* When RT signals are in use we need to use a different return stub. */
33 #ifdef __NR_rt_sigreturn
34 #define choose_restorer(flags) \
35 (flags & SA_SIGINFO) ? __default_rt_sa_restorer \
36 : __default_sa_restorer
38 #define choose_restorer(flags) \
43 #ifdef __NR_rt_sigaction
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. */
47 int __libc_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
49 struct sigaction kact;
50 if (act && !(act->sa_flags & SA_RESTORER)) {
51 memcpy(&kact, act, sizeof(kact));
52 kact.sa_restorer = choose_restorer(kact.sa_flags);
53 kact.sa_flags |= SA_RESTORER;
56 /* NB: kernel (as of 2.6.25) will return EINVAL
57 * if sizeof(act->sa_mask) does not match kernel's sizeof(sigset_t) */
58 return __syscall_rt_sigaction(sig, act, oact, sizeof(act->sa_mask));
63 /* If ACT is not NULL, change the action for SIG to *ACT.
64 If OACT is not NULL, put the old action for SIG in *OACT. */
65 int __libc_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
68 struct old_kernel_sigaction kact, koact;
71 kact.k_sa_handler = act->sa_handler;
72 kact.sa_mask = act->sa_mask.__val[0];
73 kact.sa_flags = act->sa_flags;
74 if (kact.sa_flags & SA_RESTORER) {
75 kact.sa_restorer = act->sa_restorer;
77 kact.sa_restorer = choose_restorer(kact.sa_flags);
78 kact.sa_flags |= SA_RESTORER;
81 result = __syscall_sigaction(sig,
83 oact ? &koact : NULL);
84 if (oact && result >= 0) {
85 oact->sa_handler = koact.k_sa_handler;
86 oact->sa_mask.__val[0] = koact.sa_mask;
87 oact->sa_flags = koact.sa_flags;
88 oact->sa_restorer = koact.sa_restorer;
96 #ifndef LIBC_SIGACTION
97 # ifndef __UCLIBC_HAS_THREADS__
98 strong_alias(__libc_sigaction,sigaction)
99 libc_hidden_def(sigaction)
101 weak_alias(__libc_sigaction,sigaction)
102 libc_hidden_weak(sigaction)