mirror of https://github.com/mkerrisk/man-pages
68 lines
2.1 KiB
Plaintext
68 lines
2.1 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "HTONL" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" htonl
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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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.LP
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\fB#include <arpa/inet.h>
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.br
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.sp
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uint32_t htonl(uint32_t\fP \fIhostlong\fP\fB);
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.br
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uint16_t htons(uint16_t\fP \fIhostshort\fP\fB);
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.br
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uint32_t ntohl(uint32_t\fP \fInetlong\fP\fB);
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.br
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uint16_t ntohs(uint16_t\fP \fInetshort\fP\fB);
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.br
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\fP
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.SH DESCRIPTION
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.LP
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These functions shall convert 16-bit and 32-bit quantities between
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network byte order and host byte order.
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.LP
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On some implementations, these functions are defined as macros.
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.LP
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The \fBuint32_t\fP and \fBuint16_t\fP types are defined in \fI<inttypes.h>\fP.
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.SH RETURN VALUE
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.LP
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The \fIhtonl\fP() and \fIhtons\fP() functions shall return the argument
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value converted from host to network byte order.
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.LP
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The \fIntohl\fP() and \fIntohs\fP() functions shall return the argument
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value converted from network to host byte order.
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.SH ERRORS
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.LP
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No errors are defined.
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.LP
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\fIThe following sections are informative.\fP
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.SH EXAMPLES
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.LP
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None.
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.SH APPLICATION USAGE
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.LP
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These functions are most often used in conjunction with IPv4 addresses
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and ports as returned by \fIgethostent\fP() and \fIgetservent\fP().
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fIendhostent\fP() , \fIendservent\fP() , the Base Definitions
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volume of IEEE\ Std\ 1003.1-2001, \fI<inttypes.h>\fP, \fI<arpa/inet.h>\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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