New API to retrieve process io stats, with Linux implementation

examples/diskio.c

@@ -0,0 +1,39 @@
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <glibtop.h>
+#include <glibtop/procdiskio.h>
+
+#include <stdlib.h>
+
+#include <unistd.h>
+
+static void show_diskio(pid_t pid)
+{
+  glibtop_proc_diskio diskio;
+
+  glibtop_get_proc_diskio (&diskio, pid);
+
+  printf("<%ld>\t", (long)pid);
+
+  printf("rchar : %lu, wchar : %lu, read_bytes : %lu, write_bytes : %lu\n", diskio.rchar, diskio.wchar, diskio.rbytes, diskio.wbytes);
+
+}
+
+
+int main(int argc, char **argv)
+{
+  glibtop_init();
+
+  while(*++argv)
+    {
+      pid_t pid = strtol(*argv, NULL, 10);
+      show_diskio(pid);
+    }
+
+  glibtop_close();
+
+  return 0;
+}
+