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authorLasse Collin <lasse.collin@tukaani.org>2009-09-19 09:47:30 +0300
committerLasse Collin <lasse.collin@tukaani.org>2009-09-19 09:47:30 +0300
commite599bba4216c0edb8cc8f40adad3a6dba88685f4 (patch)
treed52c699f599e276ff65302e5854a26998da1a928 /m4/tuklib_physmem.m4
parentFix incorrect use of "restrict". (diff)
downloadxz-e599bba4216c0edb8cc8f40adad3a6dba88685f4.tar.xz
Various changes.
Separate a few reusable components from XZ Utils specific code. The reusable code is now in "tuklib" modules. A few more could be separated still, e.g. bswap.h. Fix some bugs in lzmainfo. Fix physmem and cpucores code on OS/2. Thanks to Elbert Pol for help. Add OpenVMS support into physmem. Add a few #ifdefs to ease building XZ Utils on OpenVMS. Thanks to Jouk Jansen for the original patch.
Diffstat (limited to 'm4/tuklib_physmem.m4')
-rw-r--r--m4/tuklib_physmem.m4119
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