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HTONL(3P) POSIX Programmer's Manual HTONL(3P)
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
htonl, htons, ntohl, ntohs — convert values between host and network
byte order
#include <arpa/inet.h>
uint32_t htonl(uint32_t hostlong);
uint16_t htons(uint16_t hostshort);
uint32_t ntohl(uint32_t netlong);
uint16_t ntohs(uint16_t netshort);
These functions shall convert 16-bit and 32-bit quantities between
network byte order and host byte order.
On some implementations, these functions are defined as macros.
The uint32_t and uint16_t types are defined in <inttypes.h>.
The htonl() and htons() functions shall return the argument value
converted from host to network byte order.
The ntohl() and ntohs() functions shall return the argument value
converted from network to host byte order.
No errors are defined.
The following sections are informative.
None.
These functions are most often used in conjunction with IPv4
addresses and ports as returned by gethostent() and getservent().
None.
None.
endhostent(3p), endservent(3p)
The Base Definitions volume of POSIX.1‐2008, arpa_inet.h(0p),
inttypes.h(0p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) In the event of any discrepancy between this version and
the original IEEE and The Open Group Standard, the original IEEE and
The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 HTONL(3P)
Pages that refer to this page: arpa_inet.h(0p), netinet_in.h(0p), endservent(3p), ntohl(3p)