Query: onec_sum
OS: minix
Section: 3
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ONE_CSUM(3) Library Functions Manual ONE_CSUM(3)NAMEoneC_sum - One's complement internet checksumSYNOPSIS#define _MINIX_SOURCE 1 #include <stddef.h> #include <sys/types.h> #include <net/gen/oneCsum.h> u16_t oneC_sum(u16_t prev, u16_t *data, size_t size)DESCRIPTIONOneC_sum is used to calculate the one's complement checksum needed for IP network packets. A good document about the Internet Checksum is RFC-1071 (Computing the Internet checksum). One_Csum expects three parameters: prev The checksum of previous blocks of data that are to be included in the checksum. The value of prev in first call to oneC_sum should be 0. data A pointer to the block of data. The data is interpreted as a series of 16 bit numbers in network byte order, but an odd number of bytes is also allowed. size The size of the data in bytes.SEE ALSOip(4). RFC-1071AUTHORPhilip Homburg (philip@cs.vu.nl) ONE_CSUM(3)