Nilo
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fill_tftp_request()

int
          fill_tftp_request

(tftp_t *pkt, u_int16_t opcode, const char *filename, int32_t blockno);

pkt: This is a pointer to the packet to fill in.
opcode: This is the opcode, either TFTP_RRQ or TFTP_ACK.
filename: For a TFTP_RRQ, this is the filename to request.
blockno: For a TFTP_ACK, this is the number of the current block being downloaded.