zm_sendfile.h

#ifndef SOLARIS	// for the moment, solaris sendfile support is broken or crashy
#ifdef HAVE_SENDFILE4_SUPPORT
#include <sys/sendfile.h>
int zm_sendfile(int out_fd, int in_fd, off_t *offset, size_t size) {
        int err;

        err = sendfile(out_fd, in_fd, offset, size);
        if (err < 0)
                return -errno;

        return err;
}
#elif HAVE_SENDFILE7_SUPPORT
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
int zm_sendfile(int out_fd, int in_fd, off_t *offset, off_t size) {
        int err;
        err = sendfile(in_fd, out_fd, *offset, size, NULL, &size, 0);
        if (err && errno != EAGAIN)
                return -errno;

        if (size) {
                *offset += size;
                return size;
        }

        return -EAGAIN;
}
#else
#error "Your platform does not support sendfile. Sorry."
#endif
#endif