From 8e542575e044baf23ae636d32f1c6d4e3b8dea18 Mon Sep 17 00:00:00 2001
From: OBATA Akio <obache@wizdas.com>
Date: Fri, 28 Aug 2020 16:08:41 +0900
Subject: [PATCH] Add support of posix_openpt(2) to open master pseudo terminal
 device

Signed-off-by: OBATA Akio <obache@wizdas.com>
---
 CMakeLists.txt        | 1 +
 config.h.cmake        | 3 +++
 tdecore/kpty.cpp      | 6 +++++-
 tdersync/tdersync.cpp | 2 ++
 tdesu/tdesu_pty.cpp   | 6 +++++-
 5 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 48deed0c0..1b63914aa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -422,6 +422,7 @@ check_function_exists( strcasecmp HAVE_STRCASECMP )
 check_function_exists( strchr HAVE_STRCHR )
 check_function_exists( strcmp HAVE_STRCMP )
 check_function_exists( strrchr HAVE_STRRCHR )
+check_function_exists( posix_openpt HAVE_POSIX_OPENPT )
 check_function_exists( ptsname HAVE_PTSNAME )
 check_function_exists( unlockpt HAVE_UNLOCKPT )
 check_function_exists( _getpty HAVE__GETPTY )
diff --git a/config.h.cmake b/config.h.cmake
index fd1cfc462..4549fd14d 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -446,6 +446,9 @@
 /* Define to 1 if you have the `poll' function. */
 #cmakedefine HAVE_POLL 1
 
+/* Define to 1 if you have the `posix_openpt' function. */
+#cmakedefine HAVE_POSIX_OPENPT 1
+
 /* Define to 1 if the assembler supports AltiVec instructions. */
 #undef HAVE_PPC_ALTIVEC
 
diff --git a/tdecore/kpty.cpp b/tdecore/kpty.cpp
index 6e279748b..f832cd97e 100644
--- a/tdecore/kpty.cpp
+++ b/tdecore/kpty.cpp
@@ -329,7 +329,11 @@ bool KPty::open()
   // We try, as we know them, one by one.
 
 #if defined(HAVE_PTSNAME) && defined(HAVE_GRANTPT)
-#ifdef _AIX
+#if defined(HAVE_GETPT)
+  d->masterFd = ::getpt();
+#elif defined(HAVE_POSIX_OPENPT)
+  d->masterFd = ::posix_openpt(O_RDWR);
+#elif defined(_AIX)
   d->masterFd = ::open("/dev/ptc",O_RDWR);
 #else
   d->masterFd = ::open("/dev/ptmx",O_RDWR);
diff --git a/tdersync/tdersync.cpp b/tdersync/tdersync.cpp
index 464b3923b..7ffa150d0 100644
--- a/tdersync/tdersync.cpp
+++ b/tdersync/tdersync.cpp
@@ -97,6 +97,8 @@ Reference Manual for Version 2.2.x of the GNU C Library */
 
 #ifdef HAVE_GETPT
     master = getpt();
+#elif defined(HAVE_POSIX_OPENTPT)
+    master = posix_openpt(O_RDWR);
 #else
     master = open("/dev/ptmx", O_RDWR);
 #endif
diff --git a/tdesu/tdesu_pty.cpp b/tdesu/tdesu_pty.cpp
index 207c0a3e2..4b01dde86 100644
--- a/tdesu/tdesu_pty.cpp
+++ b/tdesu/tdesu_pty.cpp
@@ -94,10 +94,14 @@ PTY::~PTY()
 int PTY::getpt()
 {
 
-#if defined(HAVE_GETPT) && defined(HAVE_PTSNAME)
+#if (defined(HAVE_GETPT) || defined(HAVE_POSIX_OPENPT)) && defined(HAVE_PTSNAME)
 
     // 1: UNIX98: preferred way
+#ifdef HAVE_GETPT
     ptyfd = ::getpt();
+#elif defined(HAVE_POSIX_OPENPT)
+    ptyfd = ::posix_openpt(O_RDWR);
+#endif
     ttyname = ::ptsname(ptyfd);
     return ptyfd;