getloadavg: use libperfstat on AIX5

* lib/getloadavg.c, m4/getloadavg.m4 [aix]: Use libperfstat

diff --git a/ChangeLog b/ChangeLog
index 41e67ae..7d64aa0 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-02-05  Peter O'Gorman <pogma@thewrittenword.com>
+
+       getloadavg: use libperfstat on AIX5
+       * lib/getloadavg.c, m4/getloadavg.m4 [aix]: Use libperfstat
+
 2008-02-03  Bruno Haible  <bruno@clisp.org>
 
        * lib/diffseq.h: Add comments about required #includes.

diff --git a/lib/getloadavg.c b/lib/getloadavg.c
index eac8483..5faa8fa 100644 (file)
--- a/lib/getloadavg.c
+++ b/lib/getloadavg.c
@@ -30,6 +30,8 @@
                                If that isn't an option, then just put
                                AC_CHECK_FUNCS(pstat_getdynamic) in your
                                configure.in file.
+   HAVE_LIBPERFSTAT Define this if your system has the
+                               perfstat_cpu_total function in libperfstat (AIX).
    FIXUP_KERNEL_SYMBOL_ADDR()  Adjust address in returned struct nlist.
    KERNEL_FILE                 Name of the kernel file to nlist.
    LDAV_CVT()                  Scale the load average from the kernel.
@@ -254,7 +256,7 @@
 #   define LOAD_AVE_TYPE long
 #  endif
 
-#  ifdef _AIX
+#  if defined _AIX && ! defined HAVE_LIBPERFSTAT
 #   define LOAD_AVE_TYPE long
 #  endif
 
@@ -309,7 +311,7 @@
 #   define FSCALE 100.0
 #  endif
 
-#  ifdef _AIX
+#  if defined _AIX && !defined HAVE_LIBPERFSTAT
 #   define FSCALE 65536.0
 #  endif
 
@@ -347,7 +349,7 @@
 #  define LDAV_SYMBOL "_Loadavg"
 # endif
 
-# if !defined (LDAV_SYMBOL) && ((defined (hpux) && !defined (hp9000s300)) || defined (_SEQUENT_) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
+# if !defined (LDAV_SYMBOL) && ((defined (hpux) && !defined (hp9000s300)) || defined (_SEQUENT_) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)) || (defined (_AIX) && !defined(HAVE_LIBPERFSTAT)))
 #  define LDAV_SYMBOL "avenrun"
 # endif
 
@@ -404,6 +406,14 @@
 
 # endif /* LOAD_AVE_TYPE */
 
+# if defined HAVE_LIBPERFSTAT
+#  include <libperfstat.h>
+#  include <sys/proc.h>
+#  ifndef SBITS
+#   define SBITS 16
+#  endif
+# endif
+
 # if defined (__GNU__) && !defined (NeXT)
 /* Note that NeXT Openstep defines __GNU__ even though it should not.  */
 /* GNU system acts much like NeXT, for load average purposes,
@@ -568,6 +578,22 @@ getloadavg (double loadavg[], int nelem)
 
 # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
 
+# if ! defined LDAV_DONE && defined HAVE_LIBPERFSTAT
+#  define LDAV_DONE
+#  undef LOAD_AVE_TYPE
+/* Use perfstat_cpu_total because we don't have to be root. */
+  {
+    perfstat_cpu_total_t cpu_stats;
+    int result = perfstat_cpu_total (NULL, &cpu_stats, sizeof cpu_stats, 1);
+    if (result == -1)
+      return result;
+    loadavg[0] = cpu_stats.loadavg[0] / (double)(1 << SBITS);
+    loadavg[1] = cpu_stats.loadavg[1] / (double)(1 << SBITS);
+    loadavg[2] = cpu_stats.loadavg[2] / (double)(1 << SBITS);
+    elem = 3;
+  }
+# endif
+
 # if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__))
 #  define LDAV_DONE
 #  undef LOAD_AVE_TYPE

diff --git a/m4/getloadavg.m4 b/m4/getloadavg.m4
index 8243729..c1547c7 100644 (file)
--- a/m4/getloadavg.m4
+++ b/m4/getloadavg.m4
@@ -31,6 +31,10 @@ AC_CHECK_FUNCS(pstat_getdynamic)
 AC_CHECK_LIB(kstat, kstat_open)
 test $ac_cv_lib_kstat_kstat_open = yes && gl_have_func=yes
 
+# AIX has libperfstat which does not require root
+AC_CHECK_LIB(perfstat, perfstat_cpu_total)
+test $ac_cv_lib_perfstat_perfstat_cpu_total = yes && gl_have_func=yes
+
 # 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.