vmnet: stop recieving events when VM is stopped
[qemu/ar7.git] / bsd-user / signal-common.h
blob6f90345bb2a571057f8535e4f41cb03bfbe7579c
1 /*
2 * Emulation of BSD signals
4 * Copyright (c) 2013 Stacey Son
6 * SPDX-License-Identifier: GPL-2.0-or-later
7 */
9 #ifndef SIGNAL_COMMON_H
10 #define SIGNAL_COMMON_H
12 /**
13 * block_signals: block all signals while handling this guest syscall
15 * Block all signals, and arrange that the signal mask is returned to
16 * its correct value for the guest before we resume execution of guest code.
17 * If this function returns non-zero, then the caller should immediately
18 * return -TARGET_ERESTARTSYS to the main loop, which will take the pending
19 * signal and restart execution of the syscall.
20 * If block_signals() returns zero, then the caller can continue with
21 * emulation of the system call knowing that no signals can be taken
22 * (and therefore that no race conditions will result).
23 * This should only be called once, because if it is called a second time
24 * it will always return non-zero. (Think of it like a mutex that can't
25 * be recursively locked.)
26 * Signals will be unblocked again by process_pending_signals().
28 * Return value: non-zero if there was a pending signal, zero if not.
30 int block_signals(void); /* Returns non zero if signal pending */
32 long do_rt_sigreturn(CPUArchState *env);
33 int do_sigaction(int sig, const struct target_sigaction *act,
34 struct target_sigaction *oact);
35 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
36 long do_sigreturn(CPUArchState *env, abi_ulong addr);
37 void force_sig_fault(int sig, int code, abi_ulong addr);
38 int host_to_target_signal(int sig);
39 void host_to_target_sigset(target_sigset_t *d, const sigset_t *s);
40 void process_pending_signals(CPUArchState *env);
41 void queue_signal(CPUArchState *env, int sig, int si_type,
42 target_siginfo_t *info);
43 void signal_init(void);
44 int target_to_host_signal(int sig);
45 void target_to_host_sigset(sigset_t *d, const target_sigset_t *s);
48 * Within QEMU the top 8 bits of si_code indicate which of the parts of the
49 * union in target_siginfo is valid. This only applies between
50 * host_to_target_siginfo_noswap() and tswap_siginfo(); it does not appear
51 * either within host siginfo_t or in target_siginfo structures which we get
52 * from the guest userspace program. Linux kenrels use this internally, but BSD
53 * kernels don't do this, but its a useful abstraction.
55 * The linux-user version of this uses the top 16 bits, but FreeBSD's SI_USER
56 * and other signal indepenent SI_ codes have bit 16 set, so we only use the top
57 * byte instead.
59 * For FreeBSD, we have si_pid, si_uid, si_status, and si_addr always. Linux and
60 * {Open,Net}BSD have a different approach (where their reason field is larger,
61 * but whose siginfo has fewer fields always).
63 * QEMU_SI_CAPSICUM is currently only FreeBSD 14 current only, so only define
64 * it where _capsicum is available.
66 #define QEMU_SI_NOINFO 0 /* nothing other than si_signo valid */
67 #define QEMU_SI_FAULT 1 /* _fault is valid in _reason */
68 #define QEMU_SI_TIMER 2 /* _timer is valid in _reason */
69 #define QEMU_SI_MESGQ 3 /* _mesgq is valid in _reason */
70 #define QEMU_SI_POLL 4 /* _poll is valid in _reason */
71 #if defined(__FreeBSD_version) && __FreeBSD_version >= 1400026
72 #define QEMU_SI_CAPSICUM 5 /* _capsicum is valid in _reason */
73 #endif
75 #endif