add contrib directory & contents

contrib/interface-demo2/util.c

@@ -0,0 +1,51 @@
+/* Copyright 1998 by Andi Kleen. Subject to the GPL. */ 
+/* $Id$ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/utsname.h>
+
+#include "util.h"
+
+
+static void oom(void)
+{
+    fprintf(stderr, "out of virtual memory\n");
+    exit(2);
+}
+
+void *xmalloc(size_t sz)
+{
+    void *p = calloc(sz, 1);
+    if (!p)
+	oom();
+    return p;
+}
+
+void *xrealloc(void *oldp, size_t sz)
+{
+    void *p = realloc(oldp, sz);
+    if (!p)
+	oom();
+    return p;
+}
+
+int kernel_version(void)
+{
+    struct utsname uts;
+    int major, minor, patch;
+
+    if (uname(&uts) < 0)
+	return -1;
+    if (sscanf(uts.release, "%d.%d.%d", &major, &minor, &patch) != 3)
+	return -1;
+    return KRELEASE(major, minor, patch);
+}
+
+
+/* Like strncpy but make sure the resulting string is always 0 terminated. */  
+char *safe_strncpy(char *dst, const char *src, size_t size)
+{   
+    dst[size-1] = '\0';
+    return strncpy(dst,src,size-1);   
+}