HTONL(3)                   POSIX Programmer's Manual                  HTONL(3)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NNAAMMEE
       htonl, htons, ntohl, ntohs -- convert values between host and network
       byte order

SSYYNNOOPPSSIISS
       #include <arpa/inet.h>

       uint32_t htonl(uint32_t _h_o_s_t_l_o_n_g);
       uint16_t htons(uint16_t _h_o_s_t_s_h_o_r_t);
       uint32_t ntohl(uint32_t _n_e_t_l_o_n_g);
       uint16_t ntohs(uint16_t _n_e_t_s_h_o_r_t);

DDEESSCCRRIIPPTTIIOONN
       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 uuiinntt3322__tt and uuiinntt1166__tt types are defined in _<_i_n_t_t_y_p_e_s_._h_>.

RREETTUURRNN VVAALLUUEE
       The _h_t_o_n_l() and _h_t_o_n_s() functions shall return the argument value
       converted from host to network byte order.

       The _n_t_o_h_l() and _n_t_o_h_s() functions shall return the argument value
       converted from network to host byte order.

EERRRROORRSS
       No errors are defined.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       These functions are most often used in conjunction with IPv4 addresses
       and ports as returned by _g_e_t_h_o_s_t_e_n_t() and _g_e_t_s_e_r_v_e_n_t().

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _e_n_d_h_o_s_t_e_n_t(), _e_n_d_s_e_r_v_e_n_t()

       The Base Definitions volume of POSIX.1-2017, <<aarrppaa__iinneett..hh>>,
       <<iinnttttyyppeess..hh>>

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  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.opengroup.org/unix/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                  2017                             HTONL(3)
