From 7ae6605846ecc70c937fca31b2133082aae055df Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Tue, 19 Aug 2014 14:22:22 +0200
Subject: Use Gnulib forkpty()

---
 lib/openpty.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 lib/openpty.c

(limited to 'lib/openpty.c')

diff --git a/lib/openpty.c b/lib/openpty.c
new file mode 100644
index 00000000..63301428
--- /dev/null
+++ b/lib/openpty.c
@@ -0,0 +1,136 @@
+/* Open a pseudo-terminal.
+   Copyright (C) 2010-2014 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <pty.h>
+
+#if HAVE_OPENPTY
+
+/* Provide a wrapper with the prototype of glibc-2.8 and newer.  */
+# undef openpty
+int
+rpl_openpty (int *amaster, int *aslave, char *name,
+             struct termios const *termp, struct winsize const *winp)
+{
+  /* Cast away const, for implementations with weaker prototypes.  */
+  return openpty (amaster, aslave, name, (struct termios *) termp,
+                  (struct winsize *) winp);
+}
+
+#elif (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__ /* mingw */
+
+# include <errno.h>
+
+int
+openpty (int *amaster _GL_UNUSED, int *aslave _GL_UNUSED,
+         char *name _GL_UNUSED,
+         struct termios const *termp _GL_UNUSED,
+         struct winsize const *winp _GL_UNUSED)
+{
+  /* Mingw lacks pseudo-terminals altogether.  */
+  errno = ENOSYS;
+  return -1;
+}
+
+#else /* AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10 */
+
+# include <fcntl.h>
+# include <stdlib.h>
+# include <string.h>
+# include <sys/ioctl.h>
+# include <termios.h>
+# include <unistd.h>
+# if defined __sun || defined __hpux /* Solaris, HP-UX */
+#  include <stropts.h>
+# endif
+
+int
+openpty (int *amaster, int *aslave, char *name,
+         struct termios const *termp, struct winsize const *winp)
+{
+  int master;
+  char *slave_name;
+  int slave;
+
+# if HAVE__GETPTY /* IRIX */
+
+  slave_name = _getpty (&master, O_RDWR, 0622, 0);
+  if (slave_name == NULL)
+    return -1;
+
+# else /* AIX 5.1, HP-UX 11, Solaris 10, mingw */
+
+  /* This call uses the 'posix_openpt' module.  */
+  master = posix_openpt (O_RDWR | O_NOCTTY);
+  if (master < 0)
+    return -1;
+
+# endif
+
+  /* This call does not require a dependency to the 'grantpt' module,
+     because AIX, HP-UX, IRIX, Solaris all have the grantpt() function.  */
+  if (grantpt (master))
+    goto fail;
+
+  /* This call does not require a dependency to the 'unlockpt' module,
+     because AIX, HP-UX, IRIX, Solaris all have the unlockpt() function.  */
+  if (unlockpt (master))
+    goto fail;
+
+# if !HAVE__GETPTY /* !IRIX */
+  slave_name = ptsname (master);
+  if (slave_name == NULL)
+    goto fail;
+# endif
+
+  slave = open (slave_name, O_RDWR | O_NOCTTY);
+  if (slave == -1)
+    goto fail;
+
+# if defined __sun || defined __hpux /* Solaris, HP-UX */
+  if (ioctl (slave, I_PUSH, "ptem") < 0
+      || ioctl (slave, I_PUSH, "ldterm") < 0
+#  if defined __sun
+      || ioctl (slave, I_PUSH, "ttcompat") < 0
+#  endif
+     )
+    {
+      close (slave);
+      goto fail;
+    }
+# endif
+
+  /* XXX Should we ignore errors here?  */
+  if (termp)
+    tcsetattr (slave, TCSAFLUSH, termp);
+  if (winp)
+    ioctl (slave, TIOCSWINSZ, winp);
+
+  *amaster = master;
+  *aslave = slave;
+  if (name != NULL)
+    strcpy (name, slave_name);
+
+  return 0;
+
+ fail:
+  close (master);
+  return -1;
+}
+
+#endif
-- 
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