Use Gnulib forkpty()

1 files changed, 73 insertions, 0 deletions

diff --git a/lib/forkpty.c b/lib/forkpty.c
new file mode 100644
index 00000000..e8fe80e5
--- /dev/null
+++ b/lib/forkpty.c
@@ -0,0 +1,73 @@
+/* Fork a child process attached to the slave of 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_FORKPTY
+
+/* Provide a wrapper with the prototype of glibc-2.8 and newer.  */
+# undef forkpty
+int
+rpl_forkpty (int *amaster, char *name, struct termios const *termp,
+         struct winsize const *winp)
+{
+  /* Cast away const, for implementations with weaker prototypes.  */
+  return forkpty (amaster, name, (struct termios *) termp,
+                  (struct winsize *) winp);
+}
+
+#else /* AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10, mingw */
+
+# include <pty.h>
+# include <unistd.h>
+
+extern int login_tty (int slave_fd);
+
+int
+forkpty (int *amaster, char *name,
+         const struct termios *termp, const struct winsize *winp)
+{
+  int master, slave, pid;
+
+  if (openpty (&master, &slave, name, termp, winp) == -1)
+    return -1;
+
+  switch (pid = fork ())
+    {
+    case -1:
+      close (master);
+      close (slave);
+      return -1;
+
+    case 0:
+      /* Child.  */
+      close (master);
+      if (login_tty (slave))
+        _exit (1);
+      return 0;
+
+    default:
+      /* Parent.  */
+      *amaster = master;
+      close (slave);
+      return pid;
+    }
+}
+
+#endif