mirror of https://git.tukaani.org/xz.git
120 lines
2.5 KiB
Plaintext
120 lines
2.5 KiB
Plaintext
#
|
|
# SYNOPSIS
|
|
#
|
|
# TUKLIB_PHYSMEM
|
|
#
|
|
# DESCRIPTION
|
|
#
|
|
# Check how to get the amount of physical memory.
|
|
# This information is used in tuklib_physmem.c.
|
|
#
|
|
# Supported methods:
|
|
#
|
|
# - Windows (including Cygwin), OS/2, DJGPP (DOS), and OpenVMS have
|
|
# operating-system specific functions.
|
|
#
|
|
# - sysconf() works on GNU/Linux and Solaris, and possibly on
|
|
# some BSDs.
|
|
#
|
|
# - BSDs use sysctl().
|
|
#
|
|
# - sysinfo() works on Linux/dietlibc and probably on other Linux
|
|
# systems whose libc may lack sysconf().
|
|
#
|
|
# COPYING
|
|
#
|
|
# Author: Lasse Collin
|
|
#
|
|
# This file has been put into the public domain.
|
|
# You can do whatever you want with this file.
|
|
#
|
|
|
|
AC_DEFUN_ONCE([TUKLIB_PHYSMEM], [
|
|
AC_REQUIRE([TUKLIB_COMMON])
|
|
|
|
# sys/param.h might be needed by sys/sysctl.h.
|
|
AC_CHECK_HEADERS([sys/param.h])
|
|
|
|
AC_MSG_CHECKING([how to detect the amount of physical memory])
|
|
|
|
# Maybe checking $host_os would be enough but this matches what
|
|
# tuklib_physmem.c does.
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
|
|
#if defined(_WIN32) || defined(__CYGWIN__) || defined(__OS2__) \
|
|
|| defined(__DJGPP__) || defined(__VMS)
|
|
int main(void) { return 0; }
|
|
#else
|
|
#error
|
|
#endif
|
|
]])], [
|
|
AC_MSG_RESULT([special])
|
|
], [
|
|
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
|
|
#include <unistd.h>
|
|
int
|
|
main(void)
|
|
{
|
|
long i;
|
|
i = sysconf(_SC_PAGESIZE);
|
|
i = sysconf(_SC_PHYS_PAGES);
|
|
return 0;
|
|
}
|
|
]])], [
|
|
AC_DEFINE([TUKLIB_PHYSMEM_SYSCONF], [1],
|
|
[Define to 1 if the amount of physical memory can be detected
|
|
with sysconf(_SC_PAGESIZE) and sysconf(_SC_PHYS_PAGES).])
|
|
AC_MSG_RESULT([sysconf])
|
|
], [
|
|
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
|
|
#include <sys/types.h>
|
|
#ifdef HAVE_SYS_PARAM_H
|
|
# include <sys/param.h>
|
|
#endif
|
|
#include <sys/sysctl.h>
|
|
int
|
|
main(void)
|
|
{
|
|
int name[2] = { CTL_HW, HW_PHYSMEM };
|
|
unsigned long mem;
|
|
size_t mem_ptr_size = sizeof(mem);
|
|
sysctl(name, 2, &mem, &mem_ptr_size, NULL, 0);
|
|
return 0;
|
|
}
|
|
]])], [
|
|
AC_DEFINE([TUKLIB_PHYSMEM_SYSCTL], [1],
|
|
[Define to 1 if the amount of physical memory can be detected
|
|
with sysctl().])
|
|
AC_MSG_RESULT([sysctl])
|
|
], [
|
|
|
|
# This version of sysinfo() is Linux-specific. Some non-Linux systems have
|
|
# different sysinfo() so we must check $host_os.
|
|
case $host_os in
|
|
linux*)
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
|
|
#include <sys/sysinfo.h>
|
|
int
|
|
main(void)
|
|
{
|
|
struct sysinfo si;
|
|
sysinfo(&si);
|
|
return 0;
|
|
}
|
|
]])], [
|
|
AC_DEFINE([TUKLIB_PHYSMEM_SYSINFO], [1],
|
|
[Define to 1 if the amount of physical memory
|
|
can be detected with Linux sysinfo().])
|
|
AC_MSG_RESULT([sysinfo])
|
|
], [
|
|
AC_MSG_RESULT([unknown])
|
|
])
|
|
;;
|
|
*)
|
|
AC_MSG_RESULT([unknown])
|
|
;;
|
|
esac
|
|
])])])
|
|
])dnl
|