ptem(7)                          UNIX System V                          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 terminal.

      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 processed and acknowledged.  A hang up (such as
      stty 0) is converted to a zero length MDATA message and passed
      downstream.  Termio cflags and window row and column information are
      stored locally one per stream.  MDELAY messages are discarded.  All
      other messages are passed downstream unmodified.

      On the read-side all messages are passed upstream unmodified with the
      following exceptions.  All MREAD and MDELAY messages are freed in both
      directions.  An ioctl TCSBRK is converted to an MBREAK message and
      passed upstream and an acknowledgement 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






















10/89                                                                    Page 1