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BYTEORDER(3) NetBSD Library Functions Manual BYTEORDER(3)
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by Kimmo Suominen.
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htonl, htons, ntohl, ntohs -- convert values between host and network
Standard C Library (libc, -lc)
These routines convert 16 and 32 bit quantities between network byte
order and host byte order.
On machines which have a byte order which is the same as the network
order, these routines are defined as macros that expand to the value of
These routines are most often used in conjunction with Internet addresses
and ports as returned by gethostbyname(3) and getservent(3).
The htonl(), htons(), ntohl(), and ntohs() functions conform to IEEE Std
1003.1-2001 (``POSIX.1''). Their use of the fixed-width integer types
uint16_t and uint32_t first appeared in X/Open Networking Services
Issue 5 (``XNS5'').
The byteorder functions appeared in 4.2BSD.
The `l' and `s' suffixes in the names are not meaningful in machines
where long integers are not 32 bits.
NetBSD 5.0.1 June 10, 2004 NetBSD 5.0.1