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/usr/include/linux/signal.h is in linux-libc-dev 3.13.0-24.46.

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#ifndef _LINUX_SIGNAL_H
#define _LINUX_SIGNAL_H

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

#define SS_ONSTACK	1
#define SS_DISABLE	2

#endif /* _LINUX_SIGNAL_H */