original_kernel/arch/um/include/sigio.h

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/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __SIGIO_H__
#define __SIGIO_H__
extern int write_sigio_irq(int fd);
extern int register_sigio_fd(int fd);
extern void sigio_lock(void);
extern void sigio_unlock(void);
#endif