broken out of ../acinclude.m4

1 files changed, 124 insertions, 0 deletions

diff --git a/m4/getloadavg.m4 b/m4/getloadavg.m4
new file mode 100644
index 000000000..bb52d8ab1
--- /dev/null
+++ b/m4/getloadavg.m4
@@ -0,0 +1,124 @@
+#serial 2
+
+AC_DEFUN(AM_FUNC_GETLOADAVG,
+[ac_have_func=no # yes means we've found a way to get the load average.
+
+am_cv_saved_LIBS="$LIBS"
+
+# Solaris has libkstat which does not require root.
+AC_CHECK_LIB(kstat, kstat_open)
+if test $ac_cv_lib_kstat_kstat_open = yes ; then ac_have_func=yes ; fi
+
+# Some systems with -lutil have (and need) -lkvm as well, some do not.
+# On Solaris, -lkvm requires nlist from -lelf, so check that first
+# to get the right answer into the cache.
+# For kstat on solaris, we need libelf to force the definition of SVR4 below.
+AC_CHECK_LIB(elf, elf_begin, LIBS="-lelf $LIBS")
+if test $ac_have_func = no; then
+  AC_CHECK_LIB(kvm, kvm_open, LIBS="-lkvm $LIBS")
+  # Check for the 4.4BSD definition of getloadavg.
+  AC_CHECK_LIB(util, getloadavg,
+    [LIBS="-lutil $LIBS" ac_have_func=yes ac_cv_func_getloadavg_setgid=yes])
+fi
+
+if test $ac_have_func = no; then
+  # There is a commonly available library for RS/6000 AIX.
+  # Since it is not a standard part of AIX, it might be installed locally.
+  ac_save_LIBS="$LIBS"
+  LIBS="-L/usr/local/lib $LIBS"
+  AC_CHECK_LIB(getloadavg, getloadavg,
+    LIBS="-lgetloadavg $LIBS", LIBS="$ac_save_LIBS")
+fi
+
+# Make sure it is really in the library, if we think we found it.
+AC_REPLACE_FUNCS(getloadavg)
+
+if test $ac_cv_func_getloadavg = yes; then
+  AC_DEFINE(HAVE_GETLOADAVG)
+  ac_have_func=yes
+else
+  AC_DEFINE(C_GETLOADAVG)
+  # Figure out what our getloadavg.c needs.
+  ac_have_func=no
+  AC_CHECK_HEADER(sys/dg_sys_info.h,
+  [ac_have_func=yes; AC_DEFINE(DGUX)
+  AC_CHECK_LIB(dgc, dg_sys_info)])
+
+  # We cannot check for <dwarf.h>, because Solaris 2 does not use dwarf (it
+  # uses stabs), but it is still SVR4.  We cannot check for <elf.h> because
+  # Irix 4.0.5F has the header but not the library.
+  if test $ac_have_func = no && test $ac_cv_lib_elf_elf_begin = yes; then
+    ac_have_func=yes; AC_DEFINE(SVR4)
+  fi
+
+  if test $ac_have_func = no; then
+    AC_CHECK_HEADER(inq_stats/cpustats.h,
+    [ac_have_func=yes; AC_DEFINE(UMAX)
+    AC_DEFINE(UMAX4_3)])
+  fi
+
+  if test $ac_have_func = no; then
+    AC_CHECK_HEADER(sys/cpustats.h,
+    [ac_have_func=yes; AC_DEFINE(UMAX)])
+  fi
+
+  if test $ac_have_func = no; then
+    AC_CHECK_HEADERS(mach/mach.h)
+  fi
+
+  AC_CHECK_HEADER(nlist.h,
+  [AC_DEFINE(NLIST_STRUCT)
+  AC_CACHE_CHECK([for n_un in struct nlist], ac_cv_struct_nlist_n_un,
+  [AC_TRY_COMPILE([#include <nlist.h>],
+  [struct nlist n; n.n_un.n_name = 0;],
+  ac_cv_struct_nlist_n_un=yes, ac_cv_struct_nlist_n_un=no)])
+  if test $ac_cv_struct_nlist_n_un = yes; then
+    AC_DEFINE(NLIST_NAME_UNION)
+  fi
+  ])dnl
+fi # Do not have getloadavg in system libraries.
+
+# Some definitions of getloadavg require that the program be installed setgid.
+dnl FIXME Don't hardwire the path of getloadavg.c in the top-level directory.
+AC_CACHE_CHECK(whether getloadavg requires setgid,
+  ac_cv_func_getloadavg_setgid,
+[AC_EGREP_CPP([Yowza Am I SETGID yet],
+[#include "$srcdir/lib/getloadavg.c"
+#ifdef LDAV_PRIVILEGED
+Yowza Am I SETGID yet
+#endif],
+  ac_cv_func_getloadavg_setgid=yes, ac_cv_func_getloadavg_setgid=no)])
+if test $ac_cv_func_getloadavg_setgid = yes; then
+  NEED_SETGID=true; AC_DEFINE(GETLOADAVG_PRIVILEGED)
+else
+  NEED_SETGID=false
+fi
+AC_SUBST(NEED_SETGID)dnl
+
+if test $ac_cv_func_getloadavg_setgid = yes; then
+  AC_CACHE_CHECK(group of /dev/kmem, ac_cv_group_kmem,
+changequote(<<, >>)dnl
+<<
+  # On Solaris, /dev/kmem is a symlink.  Get info on the real file.
+  ac_ls_output=`ls -lgL /dev/kmem 2>/dev/null`
+  # If we got an error (system does not support symlinks), try without -L.
+  test -z "$ac_ls_output" && ac_ls_output=`ls -lg /dev/kmem`
+  ac_cv_group_kmem=`echo $ac_ls_output \
+    | sed -ne 's/[ 	][ 	]*/ /g;
+	       s/^.[sSrwx-]* *[0-9]* *\([^0-9]*\)  *.*/\1/;
+	       / /s/.* //;p;'`
+>>
+changequote([, ])dnl
+)
+  KMEM_GROUP=$ac_cv_group_kmem
+fi
+AC_SUBST(KMEM_GROUP)dnl
+
+if test x = "x$am_cv_saved_LIBS"; then
+  GETLOADAVG_LIBS="$LIBS"
+else
+  GETLOADAVG_LIBS=`echo "$LIBS"|sed "s!$am_cv_saved_LIBS!!"`
+fi
+AC_SUBST(GETLOADAVG_LIBS)dnl
+LIBS="$am_cv_saved_LIBS"
+])