| /* POSIX.1 sigaction call for Linux/SPARC. |
| Copyright (C) 1997-2000,2002,2003,2005 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx), 1997. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <string.h> |
| #include <syscall.h> |
| #include <sys/signal.h> |
| #include <errno.h> |
| #include <kernel_sigaction.h> |
| #include <sysdep.h> |
| |
| static void __rt_sigreturn_stub (void); |
| static void __sigreturn_stub (void); |
| |
| /* The variable is shared between all wrappers around signal handling |
| functions which have RT equivalents. */ |
| int __libc_missing_rt_sigs; |
| |
| int |
| __libc_sigaction (int sig, __const struct sigaction *act, |
| struct sigaction *oact) |
| { |
| struct old_kernel_sigaction k_sigact, k_osigact; |
| int ret; |
| |
| #ifdef __NR_rt_sigaction |
| /* First try the RT signals. */ |
| if (!__libc_missing_rt_sigs) |
| { |
| struct kernel_sigaction kact, koact; |
| unsigned long stub = 0; |
| int saved_errno = errno; |
| |
| if (act) |
| { |
| kact.k_sa_handler = act->sa_handler; |
| memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t)); |
| if (((kact.sa_flags = act->sa_flags) & SA_SIGINFO) != 0) |
| stub = (unsigned long) &__rt_sigreturn_stub; |
| else |
| stub = (unsigned long) &__sigreturn_stub; |
| stub -= 8; |
| kact.sa_restorer = NULL; |
| } |
| |
| /* XXX The size argument hopefully will have to be changed to the |
| real size of the user-level sigset_t. */ |
| ret = INLINE_SYSCALL (rt_sigaction, 5, sig, act ? &kact : 0, |
| oact ? &koact : 0, stub, _NSIG / 8); |
| |
| if (ret >= 0 || errno != ENOSYS) |
| { |
| if (oact && ret >= 0) |
| { |
| oact->sa_handler = koact.k_sa_handler; |
| memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t)); |
| oact->sa_flags = koact.sa_flags; |
| oact->sa_restorer = koact.sa_restorer; |
| } |
| return ret; |
| } |
| |
| __set_errno (saved_errno); |
| __libc_missing_rt_sigs = 1; |
| } |
| #endif |
| |
| /* Magic to tell the kernel we are using "new-style" signals, in that |
| the signal table is not kept in userspace. Not the same as the |
| really-new-style rt signals. */ |
| sig = -sig; |
| |
| if (act) |
| { |
| k_sigact.k_sa_handler = act->sa_handler; |
| k_sigact.sa_mask = act->sa_mask.__val[0]; |
| k_sigact.sa_flags = act->sa_flags; |
| k_sigact.sa_restorer = NULL; |
| } |
| |
| { |
| register int r_syscallnr __asm__("%g1") = __NR_sigaction; |
| register int r_sig __asm__("%o0") = sig; |
| register struct old_kernel_sigaction *r_act __asm__("%o1"); |
| register struct old_kernel_sigaction *r_oact __asm__("%o2"); |
| |
| r_act = act ? &k_sigact : NULL; |
| r_oact = oact ? &k_osigact : NULL; |
| |
| __asm__ __volatile__("t 0x10\n\t" |
| "bcc 1f\n\t" |
| " nop\n\t" |
| "sub %%g0,%%o0,%%o0\n" |
| "1:" |
| : "=r"(r_sig) |
| : "r"(r_syscallnr), "r"(r_act), "r"(r_oact), |
| "0"(r_sig)); |
| |
| ret = r_sig; |
| } |
| |
| if (ret >= 0) |
| { |
| if (oact) |
| { |
| oact->sa_handler = k_osigact.k_sa_handler; |
| oact->sa_mask.__val[0] = k_osigact.sa_mask; |
| oact->sa_flags = k_osigact.sa_flags; |
| oact->sa_restorer = NULL; |
| } |
| return ret; |
| } |
| |
| __set_errno (-ret); |
| return -1; |
| } |
| libc_hidden_def (__libc_sigaction) |
| |
| #ifdef WRAPPER_INCLUDE |
| # include WRAPPER_INCLUDE |
| #endif |
| |
| #ifndef LIBC_SIGACTION |
| weak_alias (__libc_sigaction, __sigaction); |
| libc_hidden_weak (__sigaction) |
| weak_alias (__libc_sigaction, sigaction); |
| #endif |
| |
| static void |
| __rt_sigreturn_stub (void) |
| { |
| __asm__ ("mov %0, %%g1\n\t" |
| "ta 0x10\n\t" |
| : /* no outputs */ |
| : "i" (__NR_rt_sigreturn)); |
| } |
| |
| static void |
| __sigreturn_stub (void) |
| { |
| __asm__ ("mov %0, %%g1\n\t" |
| "ta 0x10\n\t" |
| : /* no outputs */ |
| : "i" (__NR_sigreturn)); |
| } |