byteorder.3n

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· 3N 代码 · 共 43 行

.\" SCCSID: @(#)byteorder.3n	8.2	11/5/90
.TH byteorder 3n
.SH Name
htonl, htons, ntohl, ntohs \- convert values between host and network byte order
.SH Syntax
.nf
.B #include <sys/types.h>
.B #include <netinet/in.h>
.PP
.B netlong = htonl(hostlong);
.B u_long netlong, hostlong;
.PP
.B netshort = htons(hostshort);
.B u_short netshort, hostshort;
.PP
.B hostlong = ntohl(netlong);
.B u_long hostlong, netlong;
.PP
.B hostshort = ntohs(netshort);
.B u_short hostshort, netshort;
.fi
.SH Description
.NXR "byteorder keyword"
.NXR "htonl subroutine"
.NXR "htons subroutine"
.NXR "ntohl subroutine"
.NXR "ntohs subroutine"
These routines convert 16-bit and 32-bit quantities between network
byte order and host byte order.  On some non-ULTRIX machines
these routines are defined as null macros in the include file
<netinet/in.h>.
.PP
These routines are most often used with Internet
addresses and ports as returned by 
.MS gethostent 3n
and 
.MS getservent 3n .
.SH Restrictions
Digital's systems handle bytes in the reverse of most 
UNIX-based systems.
.SH See Also
gethostent(3n), getservent(3n)