1. 根目录:
2. include
3. linux
4. bsearch.h

#ifndef _LINUX_BSEARCH_H
#define _LINUX_BSEARCH_H

#include <linux/types.h>

void *bsearch(const void *key, const void *base, size_t num, size_t size,
	      int (*cmp)(const void *key, const void *elt));

#endif /* _LINUX_BSEARCH_H */