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.TH HTONL 3XNET "Jun 10, 2002"
.SH NAME
htonl, htons, ntohl, ntohs \- convert values between host and network byte
order
.SH SYNOPSIS
.LP
.nf
\fBcc\fR [ \fIflag\fR ... ] \fIfile\fR ... \fB-lxnet\fR [ \fIlibrary\fR ... ]
#include <arpa/inet.h>
\fBuint32_t\fR \fBhtonl\fR(\fBuint32_t\fR \fIhostlong\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
\fBuint16_t\fR \fBntohs\fR(\fBuint16_t\fR \fI netshort\fR);
.fi
.SH DESCRIPTION
.sp
.LP
These functions convert 16-bit and 32-bit quantities between network byte order
and host byte order.
.sp
.LP
The \fBuint32_t\fR and \fBuint16_t\fR types are made available by inclusion
of \fB<inttypes.h>\fR\&.
.SH USAGE
.sp
.LP
These functions are most often used in conjunction with Internet addresses and
ports as returned by \fBgethostent\fR(3XNET) and \fBgetservent\fR(3XNET).
.sp
.LP
On some architectures these functions are defined as macros that expand to the
value of their argument.
.SH RETURN VALUES
.sp
.LP
The \fBhtonl()\fR and \fBhtons()\fR functions return the argument value
converted from host to network byte order.
.sp
.LP
The \fBntohl()\fR and \fBntohs()\fR functions return the argument value
converted from network to host byte order.
.SH ERRORS
.sp
.LP
No errors are defined.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp
.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE ATTRIBUTE VALUE
_
Interface Stability Standard
_
MT-Level MT-Safe
.TE
.SH SEE ALSO
.sp
.LP
.BR endhostent (3XNET),
.BR endservent (3XNET),
.BR attributes (7),
.BR standards (7)
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