ptsname
strlcpy(line, ptsname(p), sizeof(Xline));
strlcpy(line, ptsname(master), sizeof(line));
if ((pts = ptsname(ptm)) == NULL)
char *ptsname(int);
slavename = ptsname(master);
if ((line = ptsname(STDIN_FILENO)) == NULL)
ATF_REQUIRE((ptyname = ptsname(filedesc)) != NULL);
slave = open(ptsname(master), O_RDWR | O_NOCTTY);
slave = open(ptsname(master), O_RDWR | O_NOCTTY);