minix man page for onec_sum

Query: onec_sum

OS: minix

Section: 3

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ONE_CSUM(3)						     Library Functions Manual						       ONE_CSUM(3)

NAME
oneC_sum - One's complement internet checksum
SYNOPSIS
#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)
DESCRIPTION
OneC_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 ALSO
ip(4). RFC-1071
AUTHOR
Philip Homburg (philip@cs.vu.nl) ONE_CSUM(3)