TTYNAME(3)                                                          TTYNAME(3)



NAME
       ttyname, isatty, ttyslot - find name of a terminal

SYNOPSIS
       char *ttyname(filedes)

       isatty(filedes)

       ttyslot()

DESCRIPTION
       _T_t_y_n_a_m_e  returns a pointer to the null-terminated path name of the ter‐
       minal device associated with file descriptor _f_i_l_e_d_e_s (this is a  system
       file  descriptor and has nothing to do with the standard I/O FILE type‐
       def).

       _I_s_a_t_t_y returns 1 if _f_i_l_e_d_e_s is associated with  a  terminal  device,  0
       otherwise.

       _T_t_y_s_l_o_t  returns  the  number  of the entry in the _t_t_y_s(5) file for the
       control terminal of the current process.

FILES
       /dev/∗
       /etc/ttys

SEE ALSO
       ioctl(2), ttys(5)

DIAGNOSTICS
       _T_t_y_n_a_m_e returns a null pointer (0) if _f_i_l_e_d_e_s does not describe a  ter‐
       minal device in directory ‘/dev’.

       _T_t_y_s_l_o_t returns 0 if ‘/etc/ttys’ is inaccessible or if it cannot deter‐
       mine the control terminal.

BUGS
       The return value points to static data whose content is overwritten  by
       each call.



7th Edition                      May 15, 1985                       TTYNAME(3)