12306 XPG4v2 slave pty behaviour should generally be disabled
Reviewed by: Robert Mustacchi <rm@fingolfin.org>
Change-ID: I7ccd399c22866f34dd20c6bb9d28e77ba4e24c67

*** 23,34 ****
   * Use is subject to license terms.
   */
  /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  /*        All Rights Reserved   */
  
  
- 
  /*
   * Pseudo Terminal Slave Driver.
   *
   * The pseudo-tty subsystem simulates a terminal connection, where the master
   * side represents the terminal and the slave represents the user process's
--- 23,36 ----
   * Use is subject to license terms.
   */
  /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  /*        All Rights Reserved   */
  
+ /*
+  * Copyright 2020 OmniOS Community Edition (OmniOSce) Association.
+  */
  
  /*
   * Pseudo Terminal Slave Driver.
   *
   * The pseudo-tty subsystem simulates a terminal connection, where the master
   * side represents the terminal and the slave represents the user process's
*** 104,113 ****
--- 106,116 ----
  #include <sys/types.h>
  #include <sys/param.h>
  #include <sys/sysmacros.h>
  #include <sys/stream.h>
  #include <sys/stropts.h>
+ #include <sys/strsubr.h>
  #include <sys/stat.h>
  #include <sys/errno.h>
  #include <sys/debug.h>
  #include <sys/cmn_err.h>
  #include <sys/ptms.h>
*** 335,355 ****
          }
  
          DDBGP("ptsopen: p = %p\n", (uintptr_t)ptsp);
          DDBG("ptsopen: state = %x\n", ptsp->pt_state);
  
- 
          ASSERT(ptsp->pt_minor == dminor);
  
          if ((ptsp->pt_state & PTLOCK) || !(ptsp->pt_state & PTMOPEN)) {
                  mutex_exit(&ptsp->pt_lock);
                  mutex_exit(&ptms_lock);
                  return (EAGAIN);
          }
  
          /*
!          * if already, open simply return...
           */
          if (ptsp->pt_state & PTSOPEN) {
                  ASSERT(rqp->q_ptr == ptsp);
                  ASSERT(ptsp->pts_rdq == rqp);
                  mutex_exit(&ptsp->pt_lock);
--- 338,357 ----
          }
  
          DDBGP("ptsopen: p = %p\n", (uintptr_t)ptsp);
          DDBG("ptsopen: state = %x\n", ptsp->pt_state);
  
          ASSERT(ptsp->pt_minor == dminor);
  
          if ((ptsp->pt_state & PTLOCK) || !(ptsp->pt_state & PTMOPEN)) {
                  mutex_exit(&ptsp->pt_lock);
                  mutex_exit(&ptms_lock);
                  return (EAGAIN);
          }
  
          /*
!          * if already open, simply return...
           */
          if (ptsp->pt_state & PTSOPEN) {
                  ASSERT(rqp->q_ptr == ptsp);
                  ASSERT(ptsp->pts_rdq == rqp);
                  mutex_exit(&ptsp->pt_lock);
*** 384,393 ****
--- 386,398 ----
          WR(rqp)->q_ptr = rqp->q_ptr = ptsp;
  
          mutex_exit(&ptsp->pt_lock);
          mutex_exit(&ptms_lock);
  
+         if (ptsp->pt_state & PTSTTY)
+                 STREAM(rqp)->sd_flag |= STRXPG4TTY;
+ 
          qprocson(rqp);
  
          /*
           * After qprocson pts driver is fully plumbed into the stream and can
           * send/receive messages. Setting pts_rdq will allow master side to send
*** 414,425 ****
          putnext(rqp, mop);
  
          return (0);
  }
  
- 
- 
  /*
   * Find the address to private data identifying the slave's write
   * queue. Send a 0-length msg up the slave's read queue to designate
   * the master is closing. Uattach the master from the slave by nulling
   * out master's write queue field in private data.
--- 419,428 ----