musl/include/sys/swap.h

#ifndef _SYS_SWAP_H
#define _SYS_SWAP_H

#define	SWAP_FLAG_PREFER        0x8000
#define	SWAP_FLAG_PRIO_MASK     0x7fff
#define	SWAP_FLAG_PRIO_SHIFT    0

int swapon (const char *, int);
int swapoff (const char *);

#endif