Use Gnulib forkpty()

1 files changed, 69 insertions, 0 deletions

diff --git a/m4/pty_h.m4 b/m4/pty_h.m4
new file mode 100644
index 00000000..d3cc2e7e
--- /dev/null
+++ b/m4/pty_h.m4
@@ -0,0 +1,69 @@
+# pty_h.m4 serial 10
+dnl Copyright (C) 2009-2014 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+# gl_PTY_H
+# --------
+# Set up the GNU-like <pty.h> replacement header.
+AC_DEFUN_ONCE([gl_PTY_H],
+[
+  AC_REQUIRE([gl_PTY_H_DEFAULTS])
+
+  # Make sure that pty.h provides forkpty, or setup the replacement.
+  AC_CHECK_HEADERS_ONCE([pty.h])
+  if test $ac_cv_header_pty_h != yes; then
+    HAVE_PTY_H=0
+    AC_CHECK_HEADERS([util.h libutil.h])
+    if test $ac_cv_header_util_h = yes; then
+      HAVE_UTIL_H=1
+    fi
+    if test $ac_cv_header_libutil_h = yes; then
+      HAVE_LIBUTIL_H=1
+    fi
+  else # Have <pty.h>, assume forkpty is declared there.
+    HAVE_PTY_H=1
+  fi
+  AC_SUBST([HAVE_PTY_H])
+  dnl <pty.h> is always overridden, because of GNULIB_POSIXCHECK.
+  gl_CHECK_NEXT_HEADERS([pty.h])
+
+  dnl Check for declarations of anything we want to poison if the
+  dnl corresponding gnulib module is not in use.
+  gl_WARN_ON_USE_PREPARE([[
+/* <sys/types.h> is a prerequisite of <libutil.h> on FreeBSD 8.0.  */
+#include <sys/types.h>
+#if HAVE_PTY_H
+# include <pty.h>
+#endif
+#if HAVE_UTIL_H
+# include <util.h>
+#endif
+#if HAVE_LIBUTIL_H
+# include <libutil.h>
+#endif
+    ]], [forkpty openpty])
+])
+
+AC_DEFUN([gl_PTY_MODULE_INDICATOR],
+[
+  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
+  AC_REQUIRE([gl_PTY_H_DEFAULTS])
+  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
+  dnl Define it also as a C macro, for the benefit of the unit tests.
+  gl_MODULE_INDICATOR_FOR_TESTS([$1])
+])
+
+AC_DEFUN([gl_PTY_H_DEFAULTS],
+[
+  GNULIB_FORKPTY=0;     AC_SUBST([GNULIB_FORKPTY])
+  GNULIB_OPENPTY=0;     AC_SUBST([GNULIB_OPENPTY])
+  dnl Assume proper GNU behavior unless another module says otherwise.
+  HAVE_UTIL_H=0;        AC_SUBST([HAVE_UTIL_H])
+  HAVE_LIBUTIL_H=0;     AC_SUBST([HAVE_LIBUTIL_H])
+  HAVE_FORKPTY=1;       AC_SUBST([HAVE_FORKPTY])
+  HAVE_OPENPTY=1;       AC_SUBST([HAVE_OPENPTY])
+  REPLACE_FORKPTY=0;    AC_SUBST([REPLACE_FORKPTY])
+  REPLACE_OPENPTY=0;    AC_SUBST([REPLACE_OPENPTY])
+])