'\" te
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.\" Copyright 1989 AT&T
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.TH BYTEORDER 3SOCKET "Nov 23, 2015"
.SH NAME
byteorder, htonl, htonll, htons, ntohl, ntohll, ntohs \- convert values between
host and network byte order
.SH SYNOPSIS
.LP
.nf
\fBcc\fR [ \fIflag\fR... ] \fIfile\fR... \fB-lsocket\fR \fB -lnsl \fR [ \fIlibrary\fR... ]
#include <sys/types.h>
#include <netinet/in.h>
#include <inttypes.h>

\fBuint32_t\fR \fBhtonl\fR(\fBuint32_t\fR \fIhostlong\fR);
.fi

.LP
.nf
\fBuint64_t\fR \fBhtonll\fR(\fBuint64_t\fR \fIhostlonglong\fR);
.fi

.LP
.nf
\fBuint16_t\fR \fBhtons\fR(\fBuint16_t\fR \fIhostshort\fR);
.fi

.LP
.nf
\fBuint32_t\fR \fBntohl\fR(\fBuint32_t\fR \fInetlong\fR);
.fi

.LP
.nf
\fBuint64_t\fR \fBntohll\fR(\fBuint64_t\fR \fIhostlonglong\fR);
.fi

.LP
.nf
\fBuint16_t\fR \fBntohs\fR(\fBuint16_t\fR \fInetshort\fR);
.fi

.SH DESCRIPTION
.LP
These functions convert 16-bit, 32-bit, and 64-bit quantities between network
byte order and host byte order. On some architectures these routines are
defined as \fINULL\fR macros in the include file <\fBnetinet/in.h\fR>. On other
architectures, the routines are functional when the host byte order is
different from network byte order.
.sp
.LP
These functions are most often used in conjunction with Internet addresses and
ports as returned by \fBgethostent()\fR and \fBgetservent()\fR. See
\fBgethostbyname\fR(3NSL) and \fBgetservbyname\fR(3SOCKET).
.SH ATTRIBUTES
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
MT-Level	Safe
.TE

.SH SEE ALSO
.LP
\fBgethostbyname\fR(3NSL), \fBgetservbyname\fR(3SOCKET), \fBinet.h\fR(3HEAD),
\fBattributes\fR(5)