libc/sysdeps/linux/sparc/sigaction.c

   1 /* POSIX.1 sigaction call for Linux/SPARC.
   2    Copyright (C) 1997-2000,2002,2003,2005 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.
   5
   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.
  10
  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.
  15
  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
  19    02111-1307 USA.
  20
  21        Ported to uClibc from glibc: 090520:
  22                Jan Buchholz, KIP, Uni Heidelberg <jan.buchholz@kip.uni-heidelberg.de>
  23                Austin Foxley, Ceton Corporation <austinf@cetoncorp.com>
  24 */
  25
  26 #include <errno.h>
  27 #include <signal.h>
  28 #include <string.h>
  29 #include <sys/syscall.h>
  30 #include <bits/kernel_sigaction.h>
  31
  32
  33 _syscall5(int, rt_sigaction, int, a, int, b, int, c, int, d, int, e);
  34 static void __rt_sigreturn_stub(void);
  35 static void __sigreturn_stub(void);
  36
  37 int __libc_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
  38 {
  39         int ret;
  40         struct sigaction kact, koact;
  41         unsigned long stub = 0;
  42
  43         if (act) {
  44                 kact.sa_handler = act->sa_handler;
  45                 memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
  46                 if (((kact.sa_flags = act->sa_flags) & SA_SIGINFO) != 0)
  47                         stub = (unsigned long) &__rt_sigreturn_stub;
  48                 else
  49                         stub = (unsigned long) &__sigreturn_stub;
  50                 stub -= 8;
  51                 kact.sa_restorer = NULL;
  52         }
  53
  54         /* XXX The size argument hopefully will have to be changed to the
  55          * real size of the user-level sigset_t.  */
  56         ret = INLINE_SYSCALL (rt_sigaction, 5, sig, act ? &kact : 0,
  57                         oact ? &koact : 0, stub, _NSIG / 8);
  58
  59         if (oact && ret >= 0) {
  60                 oact->sa_handler = koact.sa_handler;
  61                 memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
  62                 oact->sa_flags = koact.sa_flags;
  63                 oact->sa_restorer = koact.sa_restorer;
  64         }
  65         return ret;
  66 }
  67
  68 #ifndef LIBC_SIGACTION
  69 weak_alias(__libc_sigaction,sigaction)
  70 libc_hidden_weak(sigaction)
  71 #endif
  72
  73 static void
  74 __rt_sigreturn_stub(void)
  75 {
  76         __asm__(
  77                 "mov %0, %%g1\n\t"
  78                 "ta  0x10\n\t"
  79                 : /* no outputs */
  80                 : "i" (__NR_rt_sigreturn)
  81         );
  82 }
  83 static void
  84 __sigreturn_stub(void)
  85 {
  86         __asm__(
  87                 "mov %0, %%g1\n\t"
  88                 "ta  0x10\n\t"
  89                 : /* no outputs */
  90                 : "i" (__NR_sigreturn)
  91         );
  92 }