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337e88d890
The linux-user queue_signal() function always returns 1, and none of its callers check the return value. Give it a void return type instead. The return value is a leftover from the old pre-2016 linux-user signal handling code, which really did have a queue of signals and so might return a failure indication if too many signals were queued at once. The current design avoids having to ever have more than one signal queued via queue_signal() at once, so it can never fail. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20220114153732.3767229-4-peter.maydell@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
96 lines
3.9 KiB
C
96 lines
3.9 KiB
C
/*
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* Emulation of Linux signals
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef SIGNAL_COMMON_H
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#define SIGNAL_COMMON_H
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#include "special-errno.h"
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/* Fallback addresses into sigtramp page. */
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extern abi_ulong default_sigreturn;
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extern abi_ulong default_rt_sigreturn;
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void setup_sigtramp(abi_ulong tramp_page);
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int on_sig_stack(unsigned long sp);
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int sas_ss_flags(unsigned long sp);
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abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka);
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void target_save_altstack(target_stack_t *uss, CPUArchState *env);
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abi_long target_restore_altstack(target_stack_t *uss, CPUArchState *env);
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static inline void target_sigemptyset(target_sigset_t *set)
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{
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memset(set, 0, sizeof(*set));
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}
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void host_to_target_sigset_internal(target_sigset_t *d,
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const sigset_t *s);
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void target_to_host_sigset_internal(sigset_t *d,
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const target_sigset_t *s);
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void tswap_siginfo(target_siginfo_t *tinfo,
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const target_siginfo_t *info);
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void set_sigmask(const sigset_t *set);
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void force_sig(int sig);
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void force_sigsegv(int oldsig);
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void force_sig_fault(int sig, int code, abi_ulong addr);
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#if defined(TARGET_ARCH_HAS_SETUP_FRAME)
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void setup_frame(int sig, struct target_sigaction *ka,
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target_sigset_t *set, CPUArchState *env);
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#endif
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void setup_rt_frame(int sig, struct target_sigaction *ka,
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target_siginfo_t *info,
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target_sigset_t *set, CPUArchState *env);
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void process_pending_signals(CPUArchState *cpu_env);
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void signal_init(void);
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void queue_signal(CPUArchState *env, int sig, int si_type,
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target_siginfo_t *info);
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void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
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void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
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int target_to_host_signal(int sig);
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int host_to_target_signal(int sig);
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long do_sigreturn(CPUArchState *env);
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long do_rt_sigreturn(CPUArchState *env);
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abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr,
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CPUArchState *env);
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int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
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abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx,
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abi_ulong unew_ctx, abi_long ctx_size);
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/**
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* block_signals: block all signals while handling this guest syscall
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*
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* Block all signals, and arrange that the signal mask is returned to
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* its correct value for the guest before we resume execution of guest code.
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* If this function returns non-zero, then the caller should immediately
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* return -QEMU_ERESTARTSYS to the main loop, which will take the pending
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* signal and restart execution of the syscall.
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* If block_signals() returns zero, then the caller can continue with
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* emulation of the system call knowing that no signals can be taken
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* (and therefore that no race conditions will result).
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* This should only be called once, because if it is called a second time
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* it will always return non-zero. (Think of it like a mutex that can't
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* be recursively locked.)
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* Signals will be unblocked again by process_pending_signals().
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*
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* Return value: non-zero if there was a pending signal, zero if not.
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*/
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int block_signals(void); /* Returns non zero if signal pending */
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#endif
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