PTEM(7M)PTEM(7M)NAMEptem - STREAMS Pseudo Terminal Emulation module
SYNOPSIS
int ioctl(fd, I_PUSH, "ptem");
DESCRIPTIONptem 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 I_PUSH, streamio(7I)) onto the
slave side of a pseudo terminal STREAM, before the ldterm(7M) 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. If remote mode
is not in effect, ptem handles the TIOCSTI ioctl by copying the argu‐
ment 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 process‐
ing. A hang up (that is, stty 0) is converted to a zero length M_DATA
message and passed downstream. Termio cflags and window row and column
information are stored locally one per stream. M_DELAY 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 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, and passed
upstream and an acknowledgement is returned downstream. Finally 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.
FILES
<sys/ptem.h>
SEE ALSOstty(1), ioctl(2), ldterm(7M), pckt(7M), streamio(7I), termio(7I)
STREAMS Programming Guide
Jul 3, 1990 PTEM(7M)
