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 extern __typeof(sigaction) __libc_sigaction;
34 /* When RT signals are in use we need to use a different return stub. */
35 #ifdef __NR_rt_sigreturn
36 #define choose_restorer(flags) \
37 (flags & SA_SIGINFO) ? __default_rt_sa_restorer \
38 : __default_sa_restorer
40 #define choose_restorer(flags) \
44 #ifdef __NR_rt_sigaction
46 libc_hidden_proto(memcpy)
48 /* If ACT is not NULL, change the action for SIG to *ACT.
49 If OACT is not NULL, put the old action for SIG in *OACT. */
50 int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
53 struct kernel_sigaction kact, koact;
56 kact.k_sa_handler = act->sa_handler;
57 memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
58 kact.sa_flags = act->sa_flags;
59 # ifdef HAVE_SA_RESTORER
60 /* If the user specified SA_ONSTACK this means she is trying to
61 use the old-style stack switching. Unfortunately this
62 requires the sa_restorer field so we cannot install our own
63 handler. (In fact the user is likely to be out of luck anyway
64 since the kernel currently only supports stack switching via
65 the X/Open sigaltstack interface, but we allow for the
66 possibility that this might change in the future.) */
67 if (kact.sa_flags & (SA_RESTORER | SA_ONSTACK)) {
68 kact.sa_restorer = act->sa_restorer;
70 kact.sa_restorer = choose_restorer (kact.sa_flags);
71 kact.sa_flags |= SA_RESTORER;
76 /* XXX The size argument hopefully will have to be changed to the
77 real size of the user-level sigset_t. */
78 result = __syscall_rt_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
79 oact ? __ptrvalue (&koact) : NULL, _NSIG / 8);
80 if (oact && result >= 0) {
81 oact->sa_handler = koact.k_sa_handler;
82 memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
83 oact->sa_flags = koact.sa_flags;
84 # ifdef HAVE_SA_RESTORER
85 oact->sa_restorer = koact.sa_restorer;
94 /* If ACT is not NULL, change the action for SIG to *ACT.
95 If OACT is not NULL, put the old action for SIG in *OACT. */
96 int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
99 struct old_kernel_sigaction kact, koact;
102 kact.k_sa_handler = act->sa_handler;
103 kact.sa_mask = act->sa_mask.__val[0];
104 kact.sa_flags = act->sa_flags;
105 # ifdef HAVE_SA_RESTORER
106 /* See the comments above for why we test SA_ONSTACK. */
107 if (kact.sa_flags & (SA_RESTORER | SA_ONSTACK)) {
108 kact.sa_restorer = act->sa_restorer;
110 kact.sa_restorer = choose_restorer (kact.sa_flags);
111 kact.sa_flags |= SA_RESTORER;
115 result = __syscall_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
116 oact ? __ptrvalue (&koact) : NULL);
117 if (oact && result >= 0) {
118 oact->sa_handler = koact.k_sa_handler;
119 oact->sa_mask.__val[0] = koact.sa_mask;
120 oact->sa_flags = koact.sa_flags;
121 # ifdef HAVE_SA_RESTORER
122 oact->sa_restorer = koact.sa_restorer;
130 #ifndef LIBC_SIGACTION
131 libc_hidden_proto(sigaction)
132 weak_alias(__libc_sigaction,sigaction)
133 libc_hidden_def(sigaction)