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2b3ccf5f0d
Attaching to the gdbstub of a running process requires stopping its threads. For threads that run on a CPU, cpu_exit() is enough, but the only way to grab attention of a thread that is stuck in a long-running syscall is to interrupt it with a signal. Reserve a host realtime signal for this, just like it's already done for TARGET_SIGABRT on Linux. This may reduce the number of available guest realtime signals by one, but this is acceptable, since there are quite a lot of them, and it's unlikely that there are apps that need them all. Set signal_pending for the safe_sycall machinery to prevent invoking the syscall. This is a lie, since we don't queue a guest signal, but process_pending_signals() can handle the absence of pending signals. The syscall returns with QEMU_ERESTARTSYS errno, which arranges for the automatic restart. This is important, because it helps avoiding disturbing poorly written guests. Reviewed-by: Warner Losh <imp@bsdimp.com> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Message-Id: <20250117001542.8290-5-iii@linux.ibm.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20250207153112.3939799-14-alex.bennee@linaro.org>
25 lines
524 B
C
25 lines
524 B
C
/*
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* Signal-related declarations.
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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 USER_SIGNAL_H
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#define USER_SIGNAL_H
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#ifndef CONFIG_USER_ONLY
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#error Cannot include this header from system emulation
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#endif
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/**
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* target_to_host_signal:
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* @sig: target signal.
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*
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* On success, return the host signal between 0 (inclusive) and NSIG
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* (exclusive) corresponding to the target signal @sig. Return any other value
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* on failure.
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*/
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int target_to_host_signal(int sig);
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extern int host_interrupt_signal;
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#endif
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