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/usr/x86_64-linux-gnu/include/linux/signal.h is in linux-libc-dev-amd64-cross 4.15.0-18.19cross1.

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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_SIGNAL_H
#define _LINUX_SIGNAL_H

#include <asm/signal.h>
#include <asm/siginfo.h>

#define SS_ONSTACK	1
#define SS_DISABLE	2

/* bit-flags */
#define SS_AUTODISARM	(1U << 31)	/* disable sas during sighandling */
/* mask for all SS_xxx flags */
#define SS_FLAG_BITS	SS_AUTODISARM

#endif /* _LINUX_SIGNAL_H */