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) \
44 #ifdef __NR_rt_sigaction
47 /* If ACT is not NULL, change the action for SIG to *ACT.
48 If OACT is not NULL, put the old action for SIG in *OACT. */
49 int attribute_hidden __sigaction_internal (int sig, const struct sigaction *act, struct sigaction *oact)
52 struct kernel_sigaction kact, koact;
55 kact.k_sa_handler = act->sa_handler;
56 __memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
57 kact.sa_flags = act->sa_flags;
58 # ifdef HAVE_SA_RESTORER
59 /* If the user specified SA_ONSTACK this means she is trying to
60 use the old-style stack switching. Unfortunately this
61 requires the sa_restorer field so we cannot install our own
62 handler. (In fact the user is likely to be out of luck anyway
63 since the kernel currently only supports stack switching via
64 the X/Open sigaltstack interface, but we allow for the
65 possibility that this might change in the future.) */
66 if (kact.sa_flags & (SA_RESTORER | SA_ONSTACK)) {
67 kact.sa_restorer = act->sa_restorer;
69 kact.sa_restorer = choose_restorer (kact.sa_flags);
70 kact.sa_flags |= SA_RESTORER;
75 /* XXX The size argument hopefully will have to be changed to the
76 real size of the user-level sigset_t. */
77 result = __syscall_rt_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
78 oact ? __ptrvalue (&koact) : NULL, _NSIG / 8);
79 if (oact && result >= 0) {
80 oact->sa_handler = koact.k_sa_handler;
81 __memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
82 oact->sa_flags = koact.sa_flags;
83 # ifdef HAVE_SA_RESTORER
84 oact->sa_restorer = koact.sa_restorer;
95 /* If ACT is not NULL, change the action for SIG to *ACT.
96 If OACT is not NULL, put the old action for SIG in *OACT. */
97 int __sigaction_internal (int sig, const struct sigaction *act, struct sigaction *oact)
100 struct old_kernel_sigaction kact, koact;
103 kact.k_sa_handler = act->sa_handler;
104 kact.sa_mask = act->sa_mask.__val[0];
105 kact.sa_flags = act->sa_flags;
106 # ifdef HAVE_SA_RESTORER
107 /* See the comments above for why we test SA_ONSTACK. */
108 if (kact.sa_flags & (SA_RESTORER | SA_ONSTACK)) {
109 kact.sa_restorer = act->sa_restorer;
111 kact.sa_restorer = choose_restorer (kact.sa_flags);
112 kact.sa_flags |= SA_RESTORER;
116 result = __syscall_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
117 oact ? __ptrvalue (&koact) : NULL);
118 if (oact && result >= 0) {
119 oact->sa_handler = koact.k_sa_handler;
120 oact->sa_mask.__val[0] = koact.sa_mask;
121 oact->sa_flags = koact.sa_flags;
122 # ifdef HAVE_SA_RESTORER
123 oact->sa_restorer = koact.sa_restorer;
130 strong_alias(__sigaction_internal,__libc_sigaction)
131 weak_alias(__sigaction_internal, sigaction)