4.4BSD/usr/share/man/cat3f/isatty.0

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TTYNAM(3F)             BSD Reference Manual            TTYNAM(3F)

mer's Manual
NNAAMMEE
       ttynam, isatty - find name of a terminal port

SSYYNNOOPPSSIISS
       cchhaarraacctteerr**((**)) ffuunnccttiioonn ttttyynnaamm ((lluunniitt))

       llooggiiccaall ffuunnccttiioonn iissaattttyy ((lluunniitt))

DDEESSCCRRIIPPTTIIOONN
       _T_t_y_n_a_m returns a blank padded path name  of  the  terminal
       device associated with logical unit _l_u_n_i_t.

       _I_s_a_t_t_y  returns ..ttrruuee..  if _l_u_n_i_t is associated with a ter-
       minal device, ..ffaallssee..  otherwise.

FFIILLEESS
       /dev/*
       /usr/lib/libU77.a

DDIIAAGGNNOOSSTTIICCSS
       _T_t_y_n_a_m returns an empty string (all blanks)  if  _l_u_n_i_t  is
       not associated with a terminal device in directory `/dev'.































4.2 Berkeley Distribution  June 5, 1993                         1