PTEM(7M) STREAMS Modules PTEM(7M)

ptem — STREAMS Pseudo-Terminal Emulation module

#include <unistd.h>
#include <stropts.h>

int
ioctl(int fildes, I_PUSH, "ptem");

ptem is a STREAMS module that emulates a terminal device when used in conjunction with the line discipline, ldterm(7M), and the pseudo terminal driver, ptm(7D).

The ptem module must be pushed (see I_PUSH in streamio(7I)) onto the subsidiary device of a pseudo-terminal STREAM, before the ldterm(7M) module is pushed.

The TCSETA, TCSETAF, TCSETAW, TCGETA, TCSETS, TCSETSW, TCSETSF, TCGETS, TCSBRK, JWINSIZE, TIOCGWINSZ, and TIOCSWINSZ termio(7I) ioctl(2) messages are processed and acknowledged.

If remote mode is not in effect, ptem handles the TIOCSTI ioctl by copying the argument bytes into an M_DATA message and passing it back up the read side. Regardless of the remote mode setting, ptem acknowledges the ioctl and passes a copy of it downstream for possible further processing.

A hang up (e.g., stty 0) is converted to a zero length M_DATA message and passed downstream. termio(7I) and window row and column information are stored locally, one per stream. M_DELAY messages are discarded.

All other messages are passed downstream unmodified.

All messages are passed upstream unmodified with the following exceptions:

  • All M_READ and M_DELAY messages are freed in both directions.
  • A TCSBRK ioctl is converted to an M_BREAK message and passed upstream and an acknowledgement is returned downstream.
  • A TIOCSIGNAL ioctl is converted into an M_PCSIG message, passed upstream, and an acknowledgement is returned downstream.
  • A TIOCREMOTE ioctl is converted into an M_CTL message, acknowledged, and passed upstream; the resulting mode is retained for use in subsequent TIOCSTI parsing.

stty(1), ioctl(2), streamio(7I), termio(7I), ldterm(7M), pckt(7M)

February 5, 2022 illumos