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# pty.m4 serial 12
dnl Copyright (C) 2010-2012 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_LIB
# ----------
# Define automake variable PTY_LIB to the library needed (if any).
AC_DEFUN([gl_PTY_LIB],
[
# Check for the library required for forkpty.
PTY_LIB=
save_LIBS="$LIBS"
AC_SEARCH_LIBS([forkpty], [util],
[if test "$ac_cv_search_forkpty" != "none required"; then
PTY_LIB="$ac_cv_search_forkpty"
fi])
LIBS="$save_LIBS"
AC_SUBST([PTY_LIB])
])
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],,, [[
/* <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
]])
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([[
/* <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
]], [[
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
fi
else
dnl The system does not have forkpty.
HAVE_FORKPTY=0
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],,, [[
/* <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
]])
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([[
/* <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
]], [[
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 $gl_cv_func_openpty_const != yes; then
REPLACE_OPENPTY=1
AC_DEFINE([HAVE_OPENPTY], [1],
[Define to 1 if the system has the 'openpty' function.])
fi
else
dnl The system does not have openpty.
HAVE_OPENPTY=0
dnl Prerequisites of lib/openpty.c in this case.
AC_CHECK_FUNCS([_getpty posix_openpt])
fi
])
AC_DEFUN([gl_FUNC_LOGIN_TTY],
[
AC_REQUIRE([gl_PTY_LIB])
gl_saved_libs="$LIBS"
LIBS="$LIBS $PTY_LIB"
AC_CHECK_FUNCS([login_tty])
LIBS="$gl_saved_LIBS"
])
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