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[xz.git] / m4 / tuklib_physmem.m4
blobb5e0b1adc05bf848ce076ee9174726cc9c36d435
1 # SPDX-License-Identifier: 0BSD
3 #############################################################################
5 # SYNOPSIS
7 #   TUKLIB_PHYSMEM
9 # DESCRIPTION
11 #   Check how to get the amount of physical memory.
12 #   This information is used in tuklib_physmem.c.
14 #   Supported methods:
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
22 #       some BSDs.
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; }
60 #else
61 compile error
62 #endif
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>
71 int
72 main(void)
74         (void)_system_configuration.physmem;
75         return 0;
77 ]])], [tuklib_cv_physmem_method=aix], [
79 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
80 #include <unistd.h>
81 int
82 main(void)
84         long i;
85         i = sysconf(_SC_PAGESIZE);
86         i = sysconf(_SC_PHYS_PAGES);
87         return 0;
89 ]])], [tuklib_cv_physmem_method=sysconf], [
91 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
92 #ifdef HAVE_SYS_PARAM_H
93 #       include <sys/param.h>
94 #endif
95 #include <sys/sysctl.h>
96 int
97 main(void)
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;
105 ]])], [tuklib_cv_physmem_method=sysctl], [
107 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
108 #include <sys/sysinfo.h>
109 #include <machine/hal_sysinfo.h>
112 main(void)
114         int memkb;
115         int start = 0;
116         getsysinfo(GSI_PHYSMEM, (caddr_t)&memkb, sizeof(memkb), &start);
117         return 0;
119 ]])], [tuklib_cv_physmem_method=getsysinfo],[
121 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
122 #include <sys/param.h>
123 #include <sys/pstat.h>
126 main(void)
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;
134 ]])], [tuklib_cv_physmem_method=pstat_getstatic],[
136 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
137 #include <invent.h>
139 main(void)
141         inv_state_t *st = NULL;
142         setinvent_r(&st);
143         getinvent_r(st);
144         endinvent_r(st);
145         return 0;
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.
151 case $host_os in
152         linux*)
153                 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
154 #include <sys/sysinfo.h>
156 main(void)
158         struct sysinfo si;
159         sysinfo(&si);
160         return 0;
162                 ]])], [
163                         tuklib_cv_physmem_method=sysinfo
164                 ], [
165                         tuklib_cv_physmem_method=unknown
166                 ])
167                 ;;
168         *)
169                 tuklib_cv_physmem_method=unknown
170                 ;;
171 esac
172 ])])])])])])])])
174 case $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                 ;;
211 esac
212 ])dnl