I played around with vmsplice and splice as well. I think the glibc which is on the Microblaze rootfs is too old and doesn't have the vmsplice syscall wrapper included.
I did this:
#include <syscall.h> /* remove when using newer glibc */
# define SPLICE_F_GIFT 8 /* Pages passed in are a gift. */
# define SPLICE_F_MOVE 1 /* Move pages instead of copying. */
/* Our call to splice (no header currently). */
static inline int splice(int fdin, loff_t *off_in, int fdout, loff_t *off_out,
size_t len, unsigned int flags)
{
return syscall(SYS_splice, fdin, off_in, fdout, off_out, len, flags);
}
static inline long vmsplice(int fd, const struct iovec *iov,
unsigned long nr_segs, unsigned int flags)
{
return syscall(SYS_vmsplice, fd, iov, nr_segs, flags);
}
However, I am having problems with the way my driver uses the mmap method, vmsplice complains about bad address.
I haven't found out why yet.
