diff options
Diffstat (limited to 'm4/lc_physmem.m4')
| -rw-r--r-- | m4/lc_physmem.m4 | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/m4/lc_physmem.m4 b/m4/lc_physmem.m4 new file mode 100644 index 00000000..8633f4a1 --- /dev/null +++ b/m4/lc_physmem.m4 @@ -0,0 +1,74 @@ +dnl ########################################################################### +dnl +dnl lc_PHYSMEM - Check how to find out the amount of physical memory +dnl +dnl - sysconf() gives all the needed info on GNU+Linux and Solaris. +dnl - BSDs use sysctl(). +dnl - sysinfo() works on Linux/dietlibc and probably on other Linux systems +dnl whose libc may lack sysconf(). +dnl +dnl ########################################################################### +dnl +dnl Author: Lasse Collin +dnl +dnl This file has been put into the public domain. +dnl You can do whatever you want with this file. +dnl +dnl ########################################################################### +AC_DEFUN([lc_PHYSMEM], [ +AC_MSG_CHECKING([how to detect the amount of physical memory]) +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([HAVE_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, NULL); + return 0; +} +]])], [ + AC_DEFINE([HAVE_PHYSMEM_SYSCTL], [1], + [Define to 1 if the amount of physical memory can be detected + with sysctl().]) + AC_MSG_RESULT([sysctl]) +], [ +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +#include <sys/sysinfo.h> +int +main(void) +{ + struct sysinfo si; + sysinfo(&si); + return 0; +} +]])], [ + AC_DEFINE([HAVE_PHYSMEM_SYSINFO], [1], + [Define to 1 if the amount of physical memory can be detected + with sysinfo().]) + AC_MSG_RESULT([sysinfo]) +], [ + AC_MSG_RESULT([unknown]) +])])]) +])dnl lc_PHYSMEM |