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Diffstat (limited to 'm4/tuklib_physmem.m4')
| -rw-r--r-- | m4/tuklib_physmem.m4 | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/m4/tuklib_physmem.m4 b/m4/tuklib_physmem.m4 new file mode 100644 index 00000000..91e3dc56 --- /dev/null +++ b/m4/tuklib_physmem.m4 @@ -0,0 +1,119 @@ +# +# 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 |