mirror of https://github.com/mkerrisk/man-pages
80 lines
2.6 KiB
Groff
80 lines
2.6 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified Sat Jul 24 21:29:05 1993 by Rik Faith (faith@cs.unc.edu)
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.\" Modified Thu Jul 26 14:06:20 2001 by Andries Brouwer (aeb@cwi.nl)
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.\"
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.TH BYTEORDER 3 1993-04-15 "GNU" "Linux Programmer's Manual"
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.SH NAME
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htonl, htons, ntohl, ntohs \- convert values between host and network
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byte order
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.SH SYNOPSIS
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.nf
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.B #include <arpa/inet.h>
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.sp
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.BI "uint32_t htonl(uint32_t " hostlong );
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.sp
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.BI "uint16_t htons(uint16_t " hostshort );
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.sp
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.BI "uint32_t ntohl(uint32_t " netlong );
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.sp
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.BI "uint16_t ntohs(uint16_t " netshort );
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.fi
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.SH DESCRIPTION
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The
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.BR htonl ()
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function converts the unsigned integer \fIhostlong\fP
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from host byte order to network byte order.
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.PP
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The
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.BR htons ()
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function converts the unsigned short integer \fIhostshort\fP
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from host byte order to network byte order.
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.PP
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The
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.BR ntohl ()
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function converts the unsigned integer \fInetlong\fP
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from network byte order to host byte order.
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.PP
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The
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.BR ntohs ()
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function converts the unsigned short integer \fInetshort\fP
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from network byte order to host byte order.
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.PP
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On the i386 the host byte order is Least Significant Byte first,
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whereas the network byte order, as used on the Internet, is Most
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Significant Byte first.
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.SH "CONFORMING TO"
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POSIX.1-2001.
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Some systems require the inclusion of
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.I <netinet/in.h>
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instead of
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.IR <arpa/inet.h> .
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.SH "SEE ALSO"
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.BR gethostbyname (3),
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.BR getservent (3)
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