start a cpuinfo example

examples/cpuinfo.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+
+#include "sigar.h"
+
+int main(int argc, char **argv) {
+    int status, i;
+    sigar_t *sigar;
+    sigar_cpu_list_t cpulist;
+
+    sigar_open(&sigar);
+
+    status = sigar_cpu_list_get(sigar, &cpulist);
+
+    if (status != SIGAR_OK) {
+        printf("cpu_list error: %d (%s)\n",
+               status, sigar_strerror(sigar, status));
+        exit(1);
+    }
+
+    for (i=0; i<cpulist.number; i++) {
+        sigar_cpu_t cpu = cpulist.data[i];
+        /*...*/
+    }
+
+    sigar_cpu_list_destroy(sigar, &cpulist);
+
+    sigar_close(sigar);
+
+    return 0;
+}