/* on linux 2.4.x you get either sendfile or LFS */
#if defined HAVE_SYS_SENDFILE_H && defined HAVE_SENDFILE && (!defined _LARGEFILE_SOURCE || defined HAVE_SENDFILE64) && defined HAVE_WRITEV && defined(__linux__) && !defined HAVE_SENDFILE_BROKEN
# define USE_LINUX_SENDFILE
# include <sys/sendfile.h>
# include <sys/uio.h>
#endif
#if defined HAVE_SYS_UIO_H && defined HAVE_SENDFILE && defined HAVE_WRITEV && defined(__FreeBSD__)
# define USE_FREEBSD_SENDFILE
# include <sys/uio.h>
#endif
#if defined HAVE_SYS_SENDFILE_H && defined HAVE_SENDFILEV && defined HAVE_WRITEV && defined(__sun)
# define USE_SOLARIS_SENDFILEV
# include <sys/sendfile.h>
# include <sys/uio.h>
#endif
#if defined HAVE_SYS_UIO_H && defined HAVE_WRITEV
# define USE_WRITEV
# include <sys/uio.h>
#endif
#if defined HAVE_SYS_MMAN_H && defined HAVE_MMAP
# define USE_MMAP
# include <sys/mman.h>
/* NetBSD 1.3.x needs it */
# ifndef MAP_FAILED
# define MAP_FAILED -1
# endif
#endif
#if defined HAVE_SYS_UIO_H && defined HAVE_WRITEV && defined HAVE_SEND_FILE && defined(__aix)