tuklib_physmem.m4 revision 1.1
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), and OpenVMS have 14 # 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 40 AC_DEFUN_ONCE([TUKLIB_PHYSMEM], [ 41 AC_REQUIRE([TUKLIB_COMMON]) 42 43 # sys/param.h might be needed by sys/sysctl.h. 44 AC_CHECK_HEADERS([sys/param.h]) 45 46 AC_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. 54 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ 55 #if defined(_WIN32) || defined(__CYGWIN__) || defined(__OS2__) \ 56 || defined(__DJGPP__) || defined(__VMS) 57 int main(void) { return 0; } 58 #else 59 compile error 60 #endif 61 ]])], [tuklib_cv_physmem_method=special], [ 62 63 # Look for AIX-specific solution before sysconf(), because the test 64 # for sysconf() will pass on AIX but won't actually work 65 # (sysconf(_SC_PHYS_PAGES) compiles but always returns -1 on AIX). 66 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ 67 #include <sys/systemcfg.h> 68 69 int 70 main(void) 71 { 72 (void)_system_configuration.physmem; 73 return 0; 74 } 75 ]])], [tuklib_cv_physmem_method=aix], [ 76 77 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ 78 #include <unistd.h> 79 int 80 main(void) 81 { 82 long i; 83 i = sysconf(_SC_PAGESIZE); 84 i = sysconf(_SC_PHYS_PAGES); 85 return 0; 86 } 87 ]])], [tuklib_cv_physmem_method=sysconf], [ 88 89 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ 90 #include <sys/types.h> 91 #ifdef HAVE_SYS_PARAM_H 92 # include <sys/param.h> 93 #endif 94 #include <sys/sysctl.h> 95 int 96 main(void) 97 { 98 int name[2] = { CTL_HW, HW_PHYSMEM }; 99 unsigned long mem; 100 size_t mem_ptr_size = sizeof(mem); 101 sysctl(name, 2, &mem, &mem_ptr_size, NULL, 0); 102 return 0; 103 } 104 ]])], [tuklib_cv_physmem_method=sysctl], [ 105 106 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ 107 #include <sys/sysinfo.h> 108 #include <machine/hal_sysinfo.h> 109 110 int 111 main(void) 112 { 113 int memkb; 114 int start = 0; 115 getsysinfo(GSI_PHYSMEM, (caddr_t)&memkb, sizeof(memkb), &start); 116 return 0; 117 } 118 ]])], [tuklib_cv_physmem_method=getsysinfo],[ 119 120 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ 121 #include <sys/param.h> 122 #include <sys/pstat.h> 123 124 int 125 main(void) 126 { 127 struct pst_static pst; 128 pstat_getstatic(&pst, sizeof(pst), 1, 0); 129 (void)pst.physical_memory; 130 (void)pst.page_size; 131 return 0; 132 } 133 ]])], [tuklib_cv_physmem_method=pstat_getstatic],[ 134 135 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ 136 #include <invent.h> 137 int 138 main(void) 139 { 140 inv_state_t *st = NULL; 141 setinvent_r(&st); 142 getinvent_r(st); 143 endinvent_r(st); 144 return 0; 145 } 146 ]])], [tuklib_cv_physmem_method=getinvent_r], [ 147 148 # This version of sysinfo() is Linux-specific. Some non-Linux systems have 149 # different sysinfo() so we must check $host_os. 150 case $host_os in 151 linux*) 152 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ 153 #include <sys/sysinfo.h> 154 int 155 main(void) 156 { 157 struct sysinfo si; 158 sysinfo(&si); 159 return 0; 160 } 161 ]])], [ 162 tuklib_cv_physmem_method=sysinfo 163 ], [ 164 tuklib_cv_physmem_method=unknown 165 ]) 166 ;; 167 *) 168 tuklib_cv_physmem_method=unknown 169 ;; 170 esac 171 ])])])])])])])]) 172 173 case $tuklib_cv_physmem_method in 174 aix) 175 AC_DEFINE([TUKLIB_PHYSMEM_AIX], [1], 176 [Define to 1 if the amount of physical memory 177 can be detected with _system_configuration.physmem.]) 178 ;; 179 sysconf) 180 AC_DEFINE([TUKLIB_PHYSMEM_SYSCONF], [1], 181 [Define to 1 if the amount of physical memory can 182 be detected with sysconf(_SC_PAGESIZE) and 183 sysconf(_SC_PHYS_PAGES).]) 184 ;; 185 sysctl) 186 AC_DEFINE([TUKLIB_PHYSMEM_SYSCTL], [1], 187 [Define to 1 if the amount of physical memory can 188 be detected with sysctl().]) 189 ;; 190 getsysinfo) 191 AC_DEFINE([TUKLIB_PHYSMEM_GETSYSINFO], [1], 192 [Define to 1 if the amount of physical memory can 193 be detected with getsysinfo().]) 194 ;; 195 pstat_getstatic) 196 AC_DEFINE([TUKLIB_PHYSMEM_PSTAT_GETSTATIC], [1], 197 [Define to 1 if the amount of physical memory can 198 be detected with pstat_getstatic().]) 199 ;; 200 getinvent_r) 201 AC_DEFINE([TUKLIB_PHYSMEM_GETINVENT_R], [1], 202 [Define to 1 if the amount of physical memory 203 can be detected with getinvent_r().]) 204 ;; 205 sysinfo) 206 AC_DEFINE([TUKLIB_PHYSMEM_SYSINFO], [1], 207 [Define to 1 if the amount of physical memory 208 can be detected with Linux sysinfo().]) 209 ;; 210 esac 211 ])dnl 212
Indexes created Thu Mar 26 00:23:24 UTC 2026