mirror of https://gitee.com/openkylin/qemu.git
76 lines
3.2 KiB
C
76 lines
3.2 KiB
C
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/*
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* Emulation of BSD signals
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*
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* Copyright (c) 2013 Stacey Son
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef SIGNAL_COMMON_H
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#define SIGNAL_COMMON_H
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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 -TARGET_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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long do_rt_sigreturn(CPUArchState *env);
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int do_sigaction(int sig, const struct target_sigaction *act,
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struct target_sigaction *oact);
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abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
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long do_sigreturn(CPUArchState *env, abi_ulong addr);
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void force_sig_fault(int sig, int code, abi_ulong addr);
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int host_to_target_signal(int sig);
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void host_to_target_sigset(target_sigset_t *d, const sigset_t *s);
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void process_pending_signals(CPUArchState *env);
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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 signal_init(void);
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int target_to_host_signal(int sig);
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void target_to_host_sigset(sigset_t *d, const target_sigset_t *s);
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/*
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* Within QEMU the top 8 bits of si_code indicate which of the parts of the
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* union in target_siginfo is valid. This only applies between
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* host_to_target_siginfo_noswap() and tswap_siginfo(); it does not appear
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* either within host siginfo_t or in target_siginfo structures which we get
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* from the guest userspace program. Linux kenrels use this internally, but BSD
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* kernels don't do this, but its a useful abstraction.
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*
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* The linux-user version of this uses the top 16 bits, but FreeBSD's SI_USER
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* and other signal indepenent SI_ codes have bit 16 set, so we only use the top
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* byte instead.
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*
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* For FreeBSD, we have si_pid, si_uid, si_status, and si_addr always. Linux and
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* {Open,Net}BSD have a different approach (where their reason field is larger,
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* but whose siginfo has fewer fields always).
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*
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* QEMU_SI_CAPSICUM is currently only FreeBSD 14 current only, so only define
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* it where _capsicum is available.
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*/
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#define QEMU_SI_NOINFO 0 /* nothing other than si_signo valid */
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#define QEMU_SI_FAULT 1 /* _fault is valid in _reason */
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#define QEMU_SI_TIMER 2 /* _timer is valid in _reason */
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#define QEMU_SI_MESGQ 3 /* _mesgq is valid in _reason */
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#define QEMU_SI_POLL 4 /* _poll is valid in _reason */
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#if defined(__FreeBSD_version) && __FreeBSD_version >= 1400026
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#define QEMU_SI_CAPSICUM 5 /* _capsicum is valid in _reason */
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#endif
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#endif
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