ost_reentrant.m4

贡献一份commoncpp2,有兴趣的可以研究一下

dnl Copyright (C) 1999-2001 Open Source Telecom Corporation.
dnl  
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2 of the License, or
dnl (at your option) any later version.
dnl 
dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License for more details.
dnl 
dnl You should have received a copy of the GNU General Public License
dnl along with this program; if not, write to the Free Software 
dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
dnl 
dnl As a special exception to the GNU General Public License, if you 
dnl distribute this file as part of a program that contains a configuration 
dnl script generated by Autoconf, you may include it under the same 
dnl distribution terms that you use for the rest of that program.

AC_DEFUN([OST_LIB_REENTRANT],[
	reentrant_lib=${ost_cv_thread_library}
	if test -z "$reentrant_lib" ; then
		reentrant_lib=c_r
	fi
	if test "c" = "$reentrant_lib" ; then
		reentrant_lib=c_r
	fi
	if test "none" = "$reentrant_lib" ; then
		reentrant_lib=c_r
	fi

	AC_CHECK_FUNCS(setenv)
	AC_CHECK_LIB($reentrant_lib, localtime_r,[
		AC_DEFINE(HAVE_STRTOK_R, [1], [reentrant strtok])
		AC_DEFINE(HAVE_LOCALTIME_R, [1], [reentrant localtime])],[
		AC_CHECK_LIB(c, strtok_r, AC_DEFINE(HAVE_STRTOK_R))
		AC_CHECK_LIB(c, localtime_r, AC_DEFINE(HAVE_LOCALTIME_R))
	])
        AC_CHECK_LIB($reentrant_lib, readdir_r,[
                AC_DEFINE(HAVE_READDIR_R, [1], [reentrant readdir])],[
                AC_CHECK_LIB(c, readdir_r, AC_DEFINE(HAVE_READDIR_R, [1]))
	])
	AC_CHECK_LIB($reentrant_lib, strerror_r,[
		AC_DEFINE(HAVE_STRERROR_R, [1], [reentrant strerror])],[
		AC_CHECK_LIB(c, strerror_r, AC_DEFINE(HAVE_STRERROR_R, [1]))
	])
	AC_CHECK_LIB($reentrant_lib, getpwuid_r,[
		AC_DEFINE(HAVE_GETPWUID_R, [1], [reentrant getuid])
		AC_DEFINE(HAVE_GETPWNAM_R, [1], [reentrant getnam])],[
		AC_CHECK_LIB(c, getpwuid_r, AC_DEFINE(HAVE_GETPWUID_R))
		AC_CHECK_LIB(c, getpwnam_r, AC_DEFINE(HAVE_GETPWNAM_R))
	])
	AC_CHECK_LIB($reentrant_lib, getgrnam_r,[
		AC_DEFINE(HAVE_GETGRNAM_R, [1], [reentrant getgrnam])],[
		AC_CHECK_LIB(c, getgrnam_r, AC_DEFINE(HAVE_GETGRNAM_R))
	])
	AH_BOTTOM([

#ifndef HAVE_STRERROR_R
#define strerror_r(e, b, l) b = ::strerror(e)
#endif

#ifndef	HAVE_GETPWUID_R
#define	getpwuid_r(uid, rec, buf, size, ptr) ptr = ::getpwuid(uid)
#define	getpwnam_r(name, rec, buf, size, ptr) ptr = ::getpwnam(name)
#endif

	])
])