doio
void doio(struct command *, int *, int *);
doio(t, pipein, pipeout);
doio(vp); /* Any output? */
static void doio(vfsent_t *);
static void doio(mountent_t *);
doio(mp); /* Any output? */
doio(stdin_pipe[0], stdin_pipe[1], stdout_pipe[0], stderr_pipe[0],
doio(masterfd, -1, masterfd, -1, -1, B_FALSE);
doio(masterfd, -1, masterfd, -1, -1, B_FALSE);