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/usr/include/x86_64-linux-musl/sys/io.h is in musl-dev 0.9.15-1.

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#ifndef	_SYS_IO_H
#define	_SYS_IO_H
#ifdef __cplusplus
extern "C" {
#endif

#include <features.h>

#include <bits/io.h>

int iopl(int);
int ioperm(unsigned long, unsigned long, int);

#ifdef __cplusplus
}
#endif
#endif