fusl/src/unistd/ttyname.c

#include <unistd.h>
#include <errno.h>
#include <limits.h>

char* ttyname(int fd) {
  static char buf[TTY_NAME_MAX];
  int result;
  if ((result = ttyname_r(fd, buf, sizeof buf))) {
    errno = result;
    return NULL;
  }
  return buf;
}