linux-user/signal-common.h

   1 /*
   2  *  Emulation of Linux signals
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program 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
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef SIGNAL_COMMON_H
  21 #define SIGNAL_COMMON_H
  22
  23 int on_sig_stack(unsigned long sp);
  24 int sas_ss_flags(unsigned long sp);
  25 abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka);
  26 void target_save_altstack(target_stack_t *uss, CPUArchState *env);
  27 abi_long target_restore_altstack(target_stack_t *uss, CPUArchState *env);
  28
  29 static inline void target_sigemptyset(target_sigset_t *set)
  30 {
  31     memset(set, 0, sizeof(*set));
  32 }
  33
  34 void host_to_target_sigset_internal(target_sigset_t *d,
  35                                     const sigset_t *s);
  36 void target_to_host_sigset_internal(sigset_t *d,
  37                                     const target_sigset_t *s);
  38 void tswap_siginfo(target_siginfo_t *tinfo,
  39                    const target_siginfo_t *info);
  40 void set_sigmask(const sigset_t *set);
  41 void force_sig(int sig);
  42 void force_sigsegv(int oldsig);
  43 #if defined(TARGET_ARCH_HAS_SETUP_FRAME)
  44 void setup_frame(int sig, struct target_sigaction *ka,
  45                  target_sigset_t *set, CPUArchState *env);
  46 #endif
  47 void setup_rt_frame(int sig, struct target_sigaction *ka,
  48                     target_siginfo_t *info,
  49                     target_sigset_t *set, CPUArchState *env);
  50
  51 void process_pending_signals(CPUArchState *cpu_env);
  52 void signal_init(void);
  53 int queue_signal(CPUArchState *env, int sig, int si_type,
  54                  target_siginfo_t *info);
  55 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
  56 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
  57 int target_to_host_signal(int sig);
  58 int host_to_target_signal(int sig);
  59 long do_sigreturn(CPUArchState *env);
  60 long do_rt_sigreturn(CPUArchState *env);
  61 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr,
  62                         CPUArchState *env);
  63 int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
  64 abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx,
  65                         abi_ulong unew_ctx, abi_long ctx_size);
  66 /**
  67  * block_signals: block all signals while handling this guest syscall
  68  *
  69  * Block all signals, and arrange that the signal mask is returned to
  70  * its correct value for the guest before we resume execution of guest code.
  71  * If this function returns non-zero, then the caller should immediately
  72  * return -TARGET_ERESTARTSYS to the main loop, which will take the pending
  73  * signal and restart execution of the syscall.
  74  * If block_signals() returns zero, then the caller can continue with
  75  * emulation of the system call knowing that no signals can be taken
  76  * (and therefore that no race conditions will result).
  77  * This should only be called once, because if it is called a second time
  78  * it will always return non-zero. (Think of it like a mutex that can't
  79  * be recursively locked.)
  80  * Signals will be unblocked again by process_pending_signals().
  81  *
  82  * Return value: non-zero if there was a pending signal, zero if not.
  83  */
  84 int block_signals(void); /* Returns non zero if signal pending */
  85
  86 #endif