1#
2# SYNOPSIS
3#
4#   TUKLIB_PHYSMEM
5#
6# DESCRIPTION
7#
8#   Check how to get the amount of physical memory.
9#   This information is used in tuklib_physmem.c.
10#
11#   Supported methods:
12#
13#     - Windows (including Cygwin), OS/2, DJGPP (DOS), OpenVMS, AROS,
14#       and QNX have operating-system specific functions.
15#
16#     - AIX has _system_configuration.physmem.
17#
18#     - sysconf() works on GNU/Linux and Solaris, and possibly on
19#       some BSDs.
20#
21#     - BSDs use sysctl().
22#
23#     - Tru64 uses getsysinfo().
24#
25#     - HP-UX uses pstat_getstatic().
26#
27#     - IRIX has setinvent_r(), getinvent_r(), and endinvent_r().
28#
29#     - sysinfo() works on Linux/dietlibc and probably on other Linux
30#       systems whose libc may lack sysconf().
31#
32# COPYING
33#
34#   Author: Lasse Collin
35#
36#   This file has been put into the public domain.
37#   You can do whatever you want with this file.
38#
39
40AC_DEFUN_ONCE([TUKLIB_PHYSMEM], [
41AC_REQUIRE([TUKLIB_COMMON])
42
43# sys/param.h might be needed by sys/sysctl.h.
44AC_CHECK_HEADERS([sys/param.h])
45
46AC_CACHE_CHECK([how to detect the amount of physical memory],
47	[tuklib_cv_physmem_method], [
48
49# Maybe checking $host_os would be enough but this matches what
50# tuklib_physmem.c does.
51#
52# NOTE: IRIX has a compiler that doesn't error out with #error, so use
53# a non-compilable text instead of #error to generate an error.
54AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
55#if defined(_WIN32) || defined(__CYGWIN__) || defined(__OS2__) \
56		|| defined(__DJGPP__) || defined(__VMS) \
57		|| defined(AMIGA) || defined(__AROS__) || defined(__QNX__)
58int main(void) { return 0; }
59#else
60compile error
61#endif
62]])], [tuklib_cv_physmem_method=special], [
63
64# Look for AIX-specific solution before sysconf(), because the test
65# for sysconf() will pass on AIX but won't actually work
66# (sysconf(_SC_PHYS_PAGES) compiles but always returns -1 on AIX).
67AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
68#include <sys/systemcfg.h>
69
70int
71main(void)
72{
73	(void)_system_configuration.physmem;
74	return 0;
75}
76]])], [tuklib_cv_physmem_method=aix], [
77
78AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
79#include <unistd.h>
80int
81main(void)
82{
83	long i;
84	i = sysconf(_SC_PAGESIZE);
85	i = sysconf(_SC_PHYS_PAGES);
86	return 0;
87}
88]])], [tuklib_cv_physmem_method=sysconf], [
89
90AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
91#include <sys/types.h>
92#ifdef HAVE_SYS_PARAM_H
93#	include <sys/param.h>
94#endif
95#include <sys/sysctl.h>
96int
97main(void)
98{
99	int name[2] = { CTL_HW, HW_PHYSMEM };
100	unsigned long mem;
101	size_t mem_ptr_size = sizeof(mem);
102	sysctl(name, 2, &mem, &mem_ptr_size, NULL, 0);
103	return 0;
104}
105]])], [tuklib_cv_physmem_method=sysctl], [
106
107AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
108#include <sys/sysinfo.h>
109#include <machine/hal_sysinfo.h>
110
111int
112main(void)
113{
114	int memkb;
115	int start = 0;
116	getsysinfo(GSI_PHYSMEM, (caddr_t)&memkb, sizeof(memkb), &start);
117	return 0;
118}
119]])], [tuklib_cv_physmem_method=getsysinfo],[
120
121AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
122#include <sys/param.h>
123#include <sys/pstat.h>
124
125int
126main(void)
127{
128	struct pst_static pst;
129	pstat_getstatic(&pst, sizeof(pst), 1, 0);
130	(void)pst.physical_memory;
131	(void)pst.page_size;
132	return 0;
133}
134]])], [tuklib_cv_physmem_method=pstat_getstatic],[
135
136AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
137#include <invent.h>
138int
139main(void)
140{
141	inv_state_t *st = NULL;
142	setinvent_r(&st);
143	getinvent_r(st);
144	endinvent_r(st);
145	return 0;
146}
147]])], [tuklib_cv_physmem_method=getinvent_r], [
148
149# This version of sysinfo() is Linux-specific. Some non-Linux systems have
150# different sysinfo() so we must check $host_os.
151case $host_os in
152	linux*)
153		AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
154#include <sys/sysinfo.h>
155int
156main(void)
157{
158	struct sysinfo si;
159	sysinfo(&si);
160	return 0;
161}
162		]])], [
163			tuklib_cv_physmem_method=sysinfo
164		], [
165			tuklib_cv_physmem_method=unknown
166		])
167		;;
168	*)
169		tuklib_cv_physmem_method=unknown
170		;;
171esac
172])])])])])])])])
173
174case $tuklib_cv_physmem_method in
175	aix)
176		AC_DEFINE([TUKLIB_PHYSMEM_AIX], [1],
177			[Define to 1 if the amount of physical memory
178			can be detected with _system_configuration.physmem.])
179		;;
180	sysconf)
181		AC_DEFINE([TUKLIB_PHYSMEM_SYSCONF], [1],
182			[Define to 1 if the amount of physical memory can
183			be detected with sysconf(_SC_PAGESIZE) and
184			sysconf(_SC_PHYS_PAGES).])
185		;;
186	sysctl)
187		AC_DEFINE([TUKLIB_PHYSMEM_SYSCTL], [1],
188			[Define to 1 if the amount of physical memory can
189			be detected with sysctl().])
190		;;
191	getsysinfo)
192		AC_DEFINE([TUKLIB_PHYSMEM_GETSYSINFO], [1],
193			[Define to 1 if the amount of physical memory can
194			be detected with getsysinfo().])
195		;;
196	pstat_getstatic)
197		AC_DEFINE([TUKLIB_PHYSMEM_PSTAT_GETSTATIC], [1],
198			[Define to 1 if the amount of physical memory can
199			be detected with pstat_getstatic().])
200		;;
201	getinvent_r)
202		AC_DEFINE([TUKLIB_PHYSMEM_GETINVENT_R], [1],
203			[Define to 1 if the amount of physical memory
204			can be detected with getinvent_r().])
205		;;
206	sysinfo)
207		AC_DEFINE([TUKLIB_PHYSMEM_SYSINFO], [1],
208			[Define to 1 if the amount of physical memory
209			can be detected with Linux sysinfo().])
210		;;
211esac
212])dnl
213