fdl.texi from gnustandards

[gnulib.git] / m4 / pty.m4

diff --git a/m4/pty.m4 b/m4/pty.m4
index f2a5664..617b1b9 100644 (file)
--- a/m4/pty.m4
+++ b/m4/pty.m4
@@ -1,4 +1,4 @@
-# pty.m4 serial 1
+# pty.m4 serial 7
 dnl Copyright (C) 2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -20,12 +20,122 @@ AC_DEFUN([gl_PTY_LIB],
   AC_SUBST([PTY_LIB])
 ])
 
-AC_DEFUN([gl_FORKPTY],
+AC_DEFUN([gl_FUNC_FORKPTY],
 [
   AC_REQUIRE([gl_PTY_LIB])
+  AC_REQUIRE([gl_PTY_H])
+
+  dnl We assume that forkpty exists (possibly in libc, possibly in libutil)
+  dnl if and only if it is declared.
+  AC_CHECK_DECLS([forkpty],,, [[
+#if HAVE_PTY_H
+# include <pty.h>
+#endif
+#if HAVE_UTIL_H
+# include <util.h>
+#endif
+#if HAVE_LIBUTIL_H
+# include <libutil.h>
+#endif
+]])
+  if test $ac_cv_have_decl_forkpty = yes; then
+    dnl The system has forkpty.
+    dnl Prefer glibc's const-safe prototype, if available.
+    AC_CACHE_CHECK([for const-safe forkpty signature],
+      [gl_cv_func_forkpty_const],
+      [AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM([[
+#if HAVE_PTY_H
+# include <pty.h>
+#endif
+#if HAVE_UTIL_H
+# include <util.h>
+#endif
+#if HAVE_LIBUTIL_H
+# include <libutil.h>
+#endif
+          ]], [[
+            int forkpty (int *, char *, struct termios const *,
+                         struct winsize const *);
+          ]])
+        ],
+        [gl_cv_func_forkpty_const=yes], [gl_cv_func_forkpty_const=no])
+      ])
+    if test $gl_cv_func_forkpty_const != yes; then
+      REPLACE_FORKPTY=1
+      AC_LIBOBJ([forkpty])
+    fi
+  else
+    dnl The system does not have forkpty.
+    HAVE_FORKPTY=0
+    AC_LIBOBJ([forkpty])
+  fi
+])
+
+AC_DEFUN([gl_FUNC_OPENPTY],
+[
+  AC_REQUIRE([gl_PTY_LIB])
+  AC_REQUIRE([gl_PTY_H])
+
+  dnl Persuade Solaris <stdlib.h> to declare posix_openpt().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  dnl We assume that openpty exists (possibly in libc, possibly in libutil)
+  dnl if and only if it is declared.
+  AC_CHECK_DECLS([openpty],,, [[
+#if HAVE_PTY_H
+# include <pty.h>
+#endif
+#if HAVE_UTIL_H
+# include <util.h>
+#endif
+#if HAVE_LIBUTIL_H
+# include <libutil.h>
+#endif
+]])
+  if test $ac_cv_have_decl_openpty = yes; then
+    dnl The system has openpty.
+    dnl Prefer glibc's const-safe prototype, if available.
+    AC_CACHE_CHECK([for const-safe openpty signature],
+      [gl_cv_func_openpty_const],
+      [AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM([[
+#if HAVE_PTY_H
+# include <pty.h>
+#endif
+#if HAVE_UTIL_H
+# include <util.h>
+#endif
+#if HAVE_LIBUTIL_H
+# include <libutil.h>
+#endif
+          ]], [[
+            int openpty (int *, int *, char *, struct termios const *,
+                       struct winsize const *);
+          ]])
+        ],
+        [gl_cv_func_openpty_const=yes], [gl_cv_func_openpty_const=no])
+      ])
+    if test $gl_cv_func_openpty_const != yes; then
+      REPLACE_OPENPTY=1
+      AC_LIBOBJ([openpty])
+      AC_DEFINE([HAVE_OPENPTY], [1],
+        [Define to 1 if the system has the 'openpty' function.])
+    fi
+  else
+    dnl The system does not have openpty.
+    HAVE_OPENPTY=0
+    AC_LIBOBJ([openpty])
+    AC_CHECK_FUNCS([_getpty posix_openpt])
+  fi
 ])
 
-AC_DEFUN([gl_OPENPTY],
+AC_DEFUN([gl_FUNC_LOGIN_TTY],
 [
   AC_REQUIRE([gl_PTY_LIB])
+
+  AC_CHECK_FUNCS_ONCE([login_tty])
+  if test $ac_cv_func_login_tty = no; then
+    AC_LIBOBJ([login_tty])
+  fi
 ])