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pure-ftpd 要能支援 smbfs 這些比較特殊的 File System，必須在 configure 的時候加入 “–without-sendfile” 這個參數，讓它不使用 sendfile 這個 System Call，在 FreeBSD ports 裡，只需要將預設的 Option “SENDFILE       Support for the sendfile syscall” 取消即可。下面是官方的說明：

--without-sendfile: on Linux, Solaris, HPUX and FreeBSD kernels, Pure-FTPd
tries to reduce the CPU/memory usage by using a special system call (sendfile)
. It works very well with most filesystems. However, this optimization is not
implemented for all filesystems in current kernels. Users reported that
downloading files with Pure-FTPd failed with SMBFS (Samba) on FreeBSD and
TmpFS and NTFS on Linux (the error reported by the server is "broken pipe" or
"Error during write to data connection") . If you are planning to serve files
from these filesystems, you have to use the --without-sendfile switch to
enable a workaround. It was also reported that PA-Risc Linux systems need this
flag.