Linux Device Drivers 3 examples

1 files changed, 35 insertions, 0 deletions

diff --git a/misc-progs/datasize.c b/misc-progs/datasize.c
new file mode 100644
index 0000000..bf63423
--- /dev/null
+++ b/misc-progs/datasize.c
@@ -0,0 +1,35 @@
+/*
+ * datasize.c -- print the size of common data items
+ * This runs with any Linux kernel (not any Unix, because of <linux/types.h>)
+ *
+ * Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet
+ * Copyright (C) 2001 O'Reilly & Associates
+ *
+ * The source code in this file can be freely used, adapted,
+ * and redistributed in source or binary form, so long as an
+ * acknowledgment appears in derived source files.  The citation
+ * should list that the code comes from the book "Linux Device
+ * Drivers" by Alessandro Rubini and Jonathan Corbet, published
+ * by O'Reilly & Associates.   No warranty is attached;
+ * we cannot take responsibility for errors or fitness for use.
+ */
+#include <stdio.h>
+#include <sys/utsname.h>
+#include <linux/types.h>
+
+int main(int argc, char **argv)
+{
+    struct utsname name;
+
+    uname(&name); /* never fails :) */
+    printf("arch   Size:  char  short  int  long   ptr long-long "
+	   " u8 u16 u32 u64\n");
+    printf(       "%-12s  %3i   %3i   %3i   %3i   %3i   %3i      "
+	   "%3i %3i %3i %3i\n",
+	   name.machine,
+	   (int)sizeof(char), (int)sizeof(short), (int)sizeof(int),
+	   (int)sizeof(long),
+	   (int)sizeof(void *), (int)sizeof(long long), (int)sizeof(__u8),
+	   (int)sizeof(__u16), (int)sizeof(__u32), (int)sizeof(__u64));
+    return 0;
+}