libc/sysdeps/linux/avr32/sigaction.c

   1 /*
   2  * Copyright (C) 2004-2007 Atmel Corporation
   3  *
   4  * This file is subject to the terms and conditions of the GNU Lesser General
   5  * Public License.  See the file "COPYING.LIB" in the main directory of this
   6  * archive for more details.
   7  */
   8 #include <errno.h>
   9 #include <signal.h>
  10 #include <string.h>
  11 #include <sys/syscall.h>
  12 #include <bits/kernel_sigaction.h>
  13
  14 #define SA_RESTORER     0x04000000
  15 extern void __default_rt_sa_restorer(void);
  16
  17 /*
  18  * If act is not NULL, change the action for sig to *act.
  19  * If oact is not NULL, put the old action for sig in *oact.
  20  */
  21 int __libc_sigaction(int sig, const struct sigaction *act,
  22                      struct sigaction *oact)
  23 {
  24         struct sigaction kact;
  25
  26         if (act && !(act->sa_flags & SA_RESTORER)) {
  27                 memcpy(&kact, act, sizeof(kact));
  28                 kact.sa_restorer = __default_rt_sa_restorer;
  29                 kact.sa_flags |= SA_RESTORER;
  30                 act = &kact;
  31         }
  32
  33         /* NB: kernel (as of 2.6.25) will return EINVAL
  34          * if sizeof(act->sa_mask) does not match kernel's sizeof(sigset_t) */
  35         return __syscall_rt_sigaction(sig, act, oact, sizeof(act->sa_mask));
  36 }
  37
  38 #ifndef LIBC_SIGACTION
  39 # ifndef __UCLIBC_HAS_THREADS__
  40 strong_alias(__libc_sigaction,sigaction)
  41 libc_hidden_def(sigaction)
  42 # else
  43 weak_alias(__libc_sigaction,sigaction)
  44 libc_hidden_weak(sigaction)
  45 # endif
  46 #endif