dnl Copyright (c) 2003-2009 Brian M. Clapper.
dnl All rights reserved.
dnl 
dnl Redistribution and use in source and binary forms, with or without
dnl modification, are permitted provided that the following conditions are met:
dnl 
dnl     * Redistributions of source code must retain the above copyright
dnl       notice, this list of conditions and the following disclaimer.
dnl 
dnl     * Redistributions in binary form must reproduce the above copyright
dnl       notice, this list of conditions and the following disclaimer in the
dnl       documentation and/or other materials provided with the distribution.
dnl 
dnl     * Neither the name of the clapper.org nor the names of its
dnl       contributors may be used to endorse or promote products derived from
dnl       this software without specific prior written permission.
dnl 
dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
dnl AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
dnl IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
dnl ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
dnl LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
dnl CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
dnl SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
dnl INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
dnl CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
dnl ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
dnl POSSIBILITY OF SUCH DAMAGE.
dnl ---------------------------------------------------------------------------


dnl ---------------------------------------------------------------------------
dnl Autoconf file for daemonize
dnl
dnl Process this file with autoconf to produce a configure script.
dnl ---------------------------------------------------------------------------

AC_INIT(daemonize.c)
AC_CONFIG_HEADER(auto_config.h)

dnl ---------------------------------------------------------------------------
dnl Autoconf template
dnl ---------------------------------------------------------------------------

AH_TEMPLATE([HAVE_BASENAME])
AH_TEMPLATE([HAVE_FLOCK])
AH_TEMPLATE([HAVE_GETPGRP])
AH_TEMPLATE([HAVE_INITGROUPS])
AH_TEMPLATE([HAVE_PW_COMMENT])
AH_TEMPLATE([HAVE_PW_GECOS])
AH_TEMPLATE([HAVE_SETENV])
AH_TEMPLATE([HAVE_SETPGRP])
AH_TEMPLATE([bool])
AH_TEMPLATE([HAVE_DAEMON])
AH_TEMPLATE([HAVE_FALSE])
AH_TEMPLATE([HAVE_SETSID])
AH_TEMPLATE([HAVE_SIG_T])
AH_TEMPLATE([HAVE_STRERROR])
AH_TEMPLATE([HAVE_TRUE])

dnl ---------------------------------------------------------------------------
dnl Directories and package-specific vars
dnl ---------------------------------------------------------------------------

LOCAL_TOP_LEVEL=`pwd`

dnl ---------------------------------------------------------------------------
dnl Compiler- and language-specific programs.  Must precede the UNIX tests.
dnl ---------------------------------------------------------------------------

AC_PROG_CC
AC_PROG_CPP

AC_SUBST(CC)
AC_SUBST(CPP)

dnl ---------------------------------------------------------------------------
dnl UNIX variant hacks
dnl ---------------------------------------------------------------------------

AC_AIX

dnl ---------------------------------------------------------------------------
dnl Checks for programs via standard macros.
dnl ---------------------------------------------------------------------------

AC_PROG_INSTALL

dnl ---------------------------------------------------------------------------
dnl Checks for header files.
dnl ---------------------------------------------------------------------------

AC_HEADER_STDC
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS(errno.h)
AC_CHECK_HEADERS(libgen.h)

export CPPFLAGS

dnl ---------------------------------------------------------------------------
dnl Checks for libraries.
dnl ---------------------------------------------------------------------------

dnl ---------------------------------------------------------------------------
dnl Checks for typedefs, structures, and compiler characteristics.
dnl ---------------------------------------------------------------------------

AC_C_CONST

AC_TYPE_UID_T
AC_TYPE_MODE_T
AC_TYPE_PID_T
AC_TYPE_SIZE_T

AC_CHECK_TYPE(ssize_t, int)

dnl ***
dnl FreeBSD and some others define "sig_t" as the return type for a signal
dnl handler.  Use it if it's there; #define it otherwise.

AC_CACHE_CHECK([for 'sig_t' typedef], local_cv_have_sig_t,
	       AC_EGREP_HEADER(sig_t, signal.h, 
			       local_cv_have_sig_t=yes,
			       local_cv_have_sig_t=no))
if test "$local_cv_have_sig_t" = "yes" ; then
    AC_DEFINE(HAVE_SIG_T)
fi

dnl ***
dnl Password file stuff

AC_CACHE_CHECK([for 'struct passwd'], local_cv_have_struct_pw, 
	       AC_TRY_COMPILE([#include <pwd.h>], 
			      [struct passwd *pw;],
	                      local_cv_have_struct_pw=yes,
			      local_cv_have_struct_pw=no))
if test "$local_cv_have_struct_pw" = "no" ; then
    AC_MSG_ERROR([Sorry, but I need 'struct passwd'.])
else
dnl pw_comment or pw_gecos? Neither is required by X/Open or POSIX.

    AC_CACHE_CHECK([for 'pw_comment' field], wclib_cv_have_pw_comment,
		   AC_TRY_COMPILE([#include <pwd.h>],
				  [struct passwd *pw;
				   char *s = (char *) pw->pw_comment;],
				  wclib_cv_have_pw_comment=yes,
				  wclib_cv_have_pw_comment=no))

    AC_CACHE_CHECK([for 'pw_gecos' field], wclib_cv_have_pw_gecos,
		   AC_TRY_COMPILE([#include <pwd.h>],
				  [struct passwd *pw;
				   char *s = (char *) pw->pw_gecos;],
				  wclib_cv_have_pw_gecos=yes,
				  wclib_cv_have_pw_gecos=no))

    if test "$wclib_cv_have_pw_comment" = "yes" ; then
	AC_DEFINE(HAVE_PW_COMMENT)
    fi
    if test "$wclib_cv_have_pw_gecos" = "yes" ; then
	AC_DEFINE(HAVE_PW_GECOS)
    fi
fi


dnl ***
dnl Predefined `bool' type and various related constants

AC_CACHE_CHECK([for predefined 'bool' type], local_cv_have_bool,
	       AC_TRY_COMPILE([
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>],
			      [bool flag;],
                              local_cv_have_bool=yes,
                              local_cv_have_bool=no))
if test "$local_cv_have_bool" = "no" ; then
    AC_DEFINE(bool, short)
fi

dnl ***
dnl TRUE?

AC_CACHE_CHECK([for TRUE constant in standard headers], local_cv_have_true,
	       AC_TRY_COMPILE([
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>],
			      [if (TRUE) ;],
			      local_cv_have_true=yes,
			      local_cv_have_true=no))
if test "$local_cv_have_true" = "yes" ; then
    AC_DEFINE(HAVE_TRUE)
fi

dnl ***
dnl FALSE?

AC_CACHE_CHECK([for FALSE constant in standard headers], local_cv_have_false,
	       AC_TRY_COMPILE([
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>],
			      [if (FALSE) ;],
			      local_cv_have_false=yes,
			      local_cv_have_false=no))
if test "$local_cv_have_false" = "yes" ; then
    AC_DEFINE(HAVE_FALSE)
fi

dnl ---------------------------------------------------------------------------
dnl Checks for library functions.
dnl ---------------------------------------------------------------------------

AC_CHECK_FUNC(initgroups, AC_DEFINE(HAVE_INITGROUPS))
AC_CHECK_FUNC(getpgrp, AC_DEFINE(HAVE_GETPGRP))
AC_CHECK_FUNC(setpgrp, AC_DEFINE(HAVE_SETPGRP))

dnl setsid(2) appears to be defined for all reasonable (and some unreasonable)
dnl Unices.  Hell, even the Single Unix Specification (formerly X/Open, see
dnl `http://www.rdg.opengroup.org/onlinepubs/7908799/toc.htm') has it.
dnl If it isn't there, we define a macro that fails.

AC_CHECK_FUNC(setsid, AC_DEFINE(HAVE_SETSID))

dnl AC_FUNC_GETPGRP defines GETPGRP_VOID if getpgrp() takes no parameters.
AC_FUNC_GETPGRP

AC_FUNC_SETPGRP
AC_FUNC_VPRINTF
AC_CHECK_FUNC(vfork, AC_DEFINE(HAVE_VFORK))
AC_FUNC_VFORK

dnl ***
dnl Generate a list of missing functions that we desperately require.
dnl Any missing functions, below, will be replaced with emulators if 
dnl necessary; the value of RUNAS_MISSING_SOURCES will be substituted into
dnl the "portability" Makefile.

AC_CHECK_FUNC(strerror, AC_DEFINE(HAVE_STRERROR),
	      LOCAL_MISSING_SOURCES="${LOCAL_MISSING_SOURCES} strerror.c")

dnl Some Unices don't have a daemon(3) function. If it's missing, we
dnl supply our own emulation version.

AC_CHECK_FUNC(daemon, AC_DEFINE(HAVE_DAEMON),
	      LOCAL_MISSING_SOURCES="${LOCAL_MISSING_SOURCES} daemon.c")

AC_CHECK_FUNC(basename, AC_DEFINE(HAVE_BASENAME),
	      LOCAL_MISSING_SOURCES="${LOCAL_MISSING_SOURCES} basename.c")

AC_CHECK_FUNC(setenv, AC_DEFINE(HAVE_SETENV),
	      LOCAL_MISSING_SOURCES="${LOCAL_MISSING_SOURCES} setenv.c")

AC_CHECK_FUNC(flock, AC_DEFINE(HAVE_FLOCK),
	      LOCAL_MISSING_SOURCES="${LOCAL_MISSING_SOURCES} flock.c")

AC_SUBST(LOCAL_MISSING_SOURCES)

dnl ---------------------------------------------------------------------------
dnl System services
dnl ---------------------------------------------------------------------------

AC_SYS_LONG_FILE_NAMES

dnl ---------------------------------------------------------------------------
dnl Final configuration constants that depend on the previous stuff.
dnl ---------------------------------------------------------------------------

dnl ---------------------------------------------------------------------------
dnl Output and variable substitutions
dnl ---------------------------------------------------------------------------

dnl ***
dnl Individual Makefiles

AC_OUTPUT(Makefile)

dnl ---------------------------------------------------------------------------
dnl Copyrights and such
dnl ---------------------------------------------------------------------------

echo ""
echo "***"
echo "*** daemonize is released under a BSD-style license."
echo "*** See the LICENSE file distributed with the source code for details."
echo "***"
echo ""