1 /* POSIX.1 sigaction call for Linux/SPARC.
2 Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx), 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include <sys/signal.h>
25 #include <kernel_sigaction.h>
27 extern int __syscall_rt_sigaction (int, const struct kernel_sigaction *,
28 struct kernel_sigaction *, unsigned long,
31 static void __rt_sigreturn_stub (void);
32 static void __sigreturn_stub (void);
34 /* The variable is shared between all wrappers around signal handling
35 functions which have RT equivalents. */
36 int __libc_missing_rt_sigs;
39 __libc_sigaction (int sig, __const struct sigaction *act,
40 struct sigaction *oact)
42 struct old_kernel_sigaction k_sigact, k_osigact;
45 #ifdef __NR_rt_sigaction
46 /* First try the RT signals. */
47 if (!__libc_missing_rt_sigs)
49 struct kernel_sigaction kact, koact;
50 unsigned long stub = 0;
51 int saved_errno = errno;
55 kact.k_sa_handler = act->sa_handler;
56 memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
57 if (((kact.sa_flags = act->sa_flags) & SA_SIGINFO) != 0)
58 stub = (unsigned long) &__rt_sigreturn_stub;
60 stub = (unsigned long) &__sigreturn_stub;
62 kact.sa_restorer = NULL;
65 /* XXX The size argument hopefully will have to be changed to the
66 real size of the user-level sigset_t. */
67 ret = __syscall_rt_sigaction (sig, act ? &kact : 0,
71 if (ret >= 0 || errno != ENOSYS)
75 oact->sa_handler = koact.k_sa_handler;
76 memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
77 oact->sa_flags = koact.sa_flags;
78 oact->sa_restorer = koact.sa_restorer;
83 __set_errno (saved_errno);
84 __libc_missing_rt_sigs = 1;
88 /* Magic to tell the kernel we are using "new-style" signals, in that
89 the signal table is not kept in userspace. Not the same as the
90 really-new-style rt signals. */
95 k_sigact.k_sa_handler = act->sa_handler;
96 k_sigact.sa_mask = act->sa_mask.__val[0];
97 k_sigact.sa_flags = act->sa_flags;
98 k_sigact.sa_restorer = NULL;
102 register int r_syscallnr __asm__("%g1") = __NR_sigaction;
103 register int r_sig __asm__("%o0") = sig;
104 register struct old_kernel_sigaction *r_act __asm__("%o1");
105 register struct old_kernel_sigaction *r_oact __asm__("%o2");
107 r_act = act ? &k_sigact : NULL;
108 r_oact = oact ? &k_osigact : NULL;
110 __asm__ __volatile__("t 0x10\n\t"
113 "sub %%g0,%%o0,%%o0\n"
116 : "r"(r_syscallnr), "r"(r_act), "r"(r_oact),
126 oact->sa_handler = k_osigact.k_sa_handler;
127 oact->sa_mask.__val[0] = k_osigact.sa_mask;
128 oact->sa_flags = k_osigact.sa_flags;
129 oact->sa_restorer = NULL;
138 weak_alias (__libc_sigaction, __sigaction);
139 weak_alias (__libc_sigaction, sigaction);
142 __rt_sigreturn_stub (void)
144 __asm__ ("mov %0, %%g1\n\t"
147 : "i" (__NR_rt_sigreturn));
151 __sigreturn_stub (void)
153 __asm__ ("mov %0, %%g1\n\t"
156 : "i" (__NR_sigreturn));