ctermid(3) Library Functions Manual ctermid(3) ctermid - (libc -lc) #include char *ctermid(char *s); glibc ( feature_test_macros(7)): ctermid(): _POSIX_C_SOURCE ctermid() . s (NULL) s . L_ctermid . . attributes(7). +------------+------------------------------------+--------------------+ || | | +------------+------------------------------------+--------------------+ |ctermid() | | MT-Safe | +------------+------------------------------------+--------------------+ POSIX.1-2008. POSIX.1-2001, Svr4. /dev/tty. . ttyname(3) 3 . . : . 6.18 8 2026 ctermid(3)