ptem(7)                DEVICES AND MODULES                ptem(7)



NAME
     ptem - STREAMS Pseudo Terminal Emulation module

DESCRIPTION
     ptem is a STREAMS module that when used in conjunction  with
     a line discipline and pseudo terminal driver emulates a ter-
     minal.

     The ptem module must be  pushed  [see  IPUSH,  streamio(7)]
     onto  the slave side of a pseudo terminal STREAM, before the
     ldterm module is pushed.

     On the write-side, the  TCSETA,  TCSETAF,  TCSETAW,  TCGETA,
     TCSETS,   TCSETSW,   TCSETSF,   TCGETS,   TCSBRK,  JWINSIZE,
     TIOCGWINSZ, and TIOCSWINSZ termio ioctl(2) messages are pro-
     cessed  and  acknowledged.   A hang up (i.e. stty 0) is con-
     verted to a zero length  MDATA  message  and  passed  down-
     stream.  Termio cflags and window row and column information
     are stored locally one per  stream.   MDELAY  messages  are
     discarded.  All other messages are passed downstream unmodi-
     fied.

     On the read-side all messages are passed upstream unmodified
     with  the following exceptions.  All MREAD and MDELAY mes-
     sages are freed in both directions.  An ioctl TCSBRK is con-
     verted to an MBREAK message and passed upstream and an ack-
     nowledgement is returned downstream.  An ioctl TIOCSIGNAL is
     converted  into  an MPCSIG message, and passed upstream and
     an acknowledgement is returned downstream.  Finally an ioctl
     TIOCREMOTE is converted into an MCTL message, acknowledged,
     and passed upstream.

FILES
     <sys/ptem.h>

SEE ALSO
     stty(1),   crash(1M),    ioctl(2),    ldterm(7),    pckt(7),
     streamio(7), termio(7)
     Programmer's Guide: STREAMS.
















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