1 # SPDX-License-Identifier: 0BSD
3 #############################################################################
11 # Check how to get the amount of physical memory.
12 # This information is used in tuklib_physmem.c.
16 # - Windows (including Cygwin), OS/2, DJGPP (DOS), OpenVMS, AROS,
17 # and QNX have operating-system specific functions.
19 # - AIX has _system_configuration.physmem.
21 # - sysconf() works on GNU/Linux and Solaris, and possibly on
24 # - BSDs use sysctl().
26 # - Tru64 uses getsysinfo().
28 # - HP-UX uses pstat_getstatic().
30 # - IRIX has setinvent_r(), getinvent_r(), and endinvent_r().
32 # - sysinfo() works on Linux/dietlibc and probably on other Linux
33 # systems whose libc may lack sysconf().
35 #############################################################################
37 # Author: Lasse Collin
39 #############################################################################
41 AC_DEFUN_ONCE([TUKLIB_PHYSMEM], [
42 AC_REQUIRE([TUKLIB_COMMON])
44 # sys/param.h might be needed by sys/sysctl.h.
45 AC_CHECK_HEADERS([sys/param.h])
47 AC_CACHE_CHECK([how to detect the amount of physical memory],
48 [tuklib_cv_physmem_method], [
50 # Maybe checking $host_os would be enough but this matches what
51 # tuklib_physmem.c does.
53 # NOTE: IRIX has a compiler that doesn't error out with #error, so use
54 # a non-compilable text instead of #error to generate an error.
55 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
56 #if defined(_WIN32) || defined(__CYGWIN__) || defined(__OS2__) \
57 || defined(__DJGPP__) || defined(__VMS) \
58 || defined(AMIGA) || defined(__AROS__) || defined(__QNX__)
59 int main(void) { return 0; }
63 ]])], [tuklib_cv_physmem_method=special], [
65 # Look for AIX-specific solution before sysconf(), because the test
66 # for sysconf() will pass on AIX but won't actually work
67 # (sysconf(_SC_PHYS_PAGES) compiles but always returns -1 on AIX).
68 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
69 #include <sys/systemcfg.h>
74 (void)_system_configuration.physmem;
77 ]])], [tuklib_cv_physmem_method=aix], [
79 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
85 i = sysconf(_SC_PAGESIZE);
86 i = sysconf(_SC_PHYS_PAGES);
89 ]])], [tuklib_cv_physmem_method=sysconf], [
91 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
92 #ifdef HAVE_SYS_PARAM_H
93 # include <sys/param.h>
95 #include <sys/sysctl.h>
99 int name[2] = { CTL_HW, HW_PHYSMEM };
101 size_t mem_ptr_size = sizeof(mem);
102 sysctl(name, 2, &mem, &mem_ptr_size, NULL, 0);
105 ]])], [tuklib_cv_physmem_method=sysctl], [
107 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
108 #include <sys/sysinfo.h>
109 #include <machine/hal_sysinfo.h>
116 getsysinfo(GSI_PHYSMEM, (caddr_t)&memkb, sizeof(memkb), &start);
119 ]])], [tuklib_cv_physmem_method=getsysinfo],[
121 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
122 #include <sys/param.h>
123 #include <sys/pstat.h>
128 struct pst_static pst;
129 pstat_getstatic(&pst, sizeof(pst), 1, 0);
130 (void)pst.physical_memory;
134 ]])], [tuklib_cv_physmem_method=pstat_getstatic],[
136 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
141 inv_state_t *st = NULL;
147 ]])], [tuklib_cv_physmem_method=getinvent_r], [
149 # This version of sysinfo() is Linux-specific. Some non-Linux systems have
150 # different sysinfo() so we must check $host_os.
153 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
154 #include <sys/sysinfo.h>
163 tuklib_cv_physmem_method=sysinfo
165 tuklib_cv_physmem_method=unknown
169 tuklib_cv_physmem_method=unknown
174 case $tuklib_cv_physmem_method in
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.])
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).])
187 AC_DEFINE([TUKLIB_PHYSMEM_SYSCTL], [1],
188 [Define to 1 if the amount of physical memory can
189 be detected with sysctl().])
192 AC_DEFINE([TUKLIB_PHYSMEM_GETSYSINFO], [1],
193 [Define to 1 if the amount of physical memory can
194 be detected with getsysinfo().])
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().])
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().])
207 AC_DEFINE([TUKLIB_PHYSMEM_SYSINFO], [1],
208 [Define to 1 if the amount of physical memory
209 can be detected with Linux sysinfo().])