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struct relay {
/* IN: file descriptor to read from */
int source;
/* IN: file descriptor to read to */
int dest;
/* IN+OUT: errno for failed read. -1 if EOF reached. */
int readerror;
/* IN+OUT: errno for failed write. EPIPE if receiver is dead. */
int writeerror;
/* IN: for private use by the callback function */
void * userdata;
};
extern int relay_once(struct relay *,
int,
struct timeval *,
int (*)(struct relay*, char*, size_t));
extern int relay_all(struct relay *,
int,
int (*)(struct relay*, char*, size_t));
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