rcv_mktemp
static int rcv_mktemp(SCR *, char *, char *, int);
if ((fd = rcv_mktemp(sp, path, dp, S_IRWXU)) == -1)
if ((fd = rcv_mktemp(sp, buf, dp, S_IRUSR | S_IWUSR)) == -1)
if ((fd = rcv_mktemp(sp, mpath, dp, S_IRUSR | S_IWUSR)) == -1)