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

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#ifndef	_PTY_H
#define	_PTY_H

#ifdef __cplusplus
extern "C" {
#endif

#include <termios.h>
#include <sys/ioctl.h>

int openpty(int *, int *, char *, const struct termios *, const struct winsize *);
int forkpty(int *, char *, const struct termios *, const struct winsize *);

#ifdef __cplusplus
}
#endif

#endif