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  22 .Dd August 2, 2018
  23 .Dt BYTEORDER 3C
  24 .Os
  25 .Sh NAME
  26 .Nm byteorder ,
  27 .Nm htonl ,
  28 .Nm htonll ,
  29 .Nm htons ,
  30 .Nm ntohl ,
  31 .Nm ntohll ,
  32 .Nm ntohs
  33 .Nd convert values between host and network byte order
  34 .Sh LIBRARY
  35 .Lb libc
  36 .Sh SYNOPSIS
  37 .In sys/types.h
  38 .In netinet/in.h
  39 .In inttypes.h
  40 .Ft uint32_t
  41 .Fo htonl
  42 .Fa "uint32_t hostlong"
  43 .Fc
  44 .Ft uint64_t
  45 .Fo htonll
  46 .Fa "uint64_t hostlonglong"
  47 .Fc
  48 .Ft uint16_t
  49 .Fo htons
  50 .Fa "uint16_t hostshort"
  51 .Fc
  52 .Ft uint32_t
  53 .Fo ntohl
  54 .Fa "uint32_t netlong"
  55 .Fc
  56 .Ft uint64_t
  57 .Fo ntohll
  58 .Fa "uint64_t netlonglong"
  59 .Fc
  60 .Ft uint16_t
  61 .Fo ntohs
  62 .Fa "uint16_t netshort"
  63 .Fc
  64 .Sh DESCRIPTION
  65 These functions convert 16-bit, 32-bit, and 64-bit quantities between network
  66 byte order and host byte order.
  67 On some architectures these routines are defined as
  68 .Dv NULL
  69 macros in the include file
  70 .In netinet/in.h .
  71 On other architectures, the routines are functional when the host byte order is
  72 different from network byte order.
  73 .Pp
  74 These functions are most often used in conjunction with Internet addresses and
  75 ports as returned by
  76 .Xr gethostent 3NSL
  77 and
  78 .Xr getservent 3NSL .
  79 .Sh MT-LEVEL
  80 .Sy Safe
  81 .Sh SEE ALSO
  82 .Xr inet.h 3HEAD ,
  83 .Xr gethostent 3NSL ,
  84 .Xr getservent 3NSL ,
  85 .Xr attributes 5 ,
  86 .Xr byteorder 5