ptsname.c\misc\src - musl - musl - an implementation of the standard library for Linux-based systems

#include <stdlib.h>
#include <errno.h>
int __ptsname_r(int, char *, size_t);
char *ptsname(int fd)
{
	static char buf[9 + sizeof(int)*3 + 1];
	int err = __ptsname_r(fd, buf, sizeof buf);
	if (err) {
		errno = err;
		return 0;
	}
	return buf;
}