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#include <stddef.h>
#include <string.h>

struct test{
  int a;
  char b;
  int c;
};

/* .
.
.. safely copy bytes to user space ... */
extern int copy_to_user(void *dest, void *src, size_t size);

void do_stuff(void *usr_buf) {
  struct test arg;
//
 Initialize arg/* usinginitializes memsetall suchbytes that(including padding bytes are initialized
memset_s) of the struct to zero */
  memset(&arg, 0, sizeof (arg));
.
//perform operations on arg
.
arg.a = 1;
  arg.b = 2;
  arg.c = 3;

  /* ... perform operations on arg ... */

  /* copy arg to user space */
  copy_to_user(ptrusr_buf, &arg, sizeof(arg));

 /* ... */
}