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+'\" t
+.\" Copyright 2002 Ian Redfern (redferni@logica.com)
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.\" References consulted:
+.\"     Linux libc source code
+.\"     FreeBSD 4.4 man pages
+.\"
+.\" Minor additions, aeb, 2013-06-21
+.\"
+.TH ether_aton 3 2023-07-20 "Linux man-pages 6.05.01"
+.SH NAME
+ether_aton, ether_ntoa, ether_ntohost, ether_hostton, ether_line,
+ether_ntoa_r, ether_aton_r \- Ethernet address manipulation routines
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <netinet/ether.h>
+.PP
+.BI "char *ether_ntoa(const struct ether_addr *" addr );
+.BI "struct ether_addr *ether_aton(const char *" asc );
+.PP
+.BI "int ether_ntohost(char *" hostname ", const struct ether_addr *" addr );
+.BI "int ether_hostton(const char *" hostname ", struct ether_addr *" addr );
+.PP
+.BI "int ether_line(const char *" line ", struct ether_addr *" addr ,
+.BI "               char *" hostname );
+.PP
+/* GNU extensions */
+.BI "char *ether_ntoa_r(const struct ether_addr *" addr ", char *" buf );
+.PP
+.BI "struct ether_addr *ether_aton_r(const char *" asc ,
+.BI "                                struct ether_addr *" addr );
+.fi
+.SH DESCRIPTION
+.BR ether_aton ()
+converts the 48-bit Ethernet host address
+.I asc
+from the standard hex-digits-and-colons notation into binary data in
+network byte order and returns a pointer to it in a statically
+allocated buffer, which subsequent calls will
+overwrite.
+.BR ether_aton ()
+returns NULL if the address is invalid.
+.PP
+The
+.BR ether_ntoa ()
+function converts the Ethernet host address
+.I addr
+given in network byte order to a string in standard
+hex-digits-and-colons notation, omitting leading zeros.
+The string is returned in a statically allocated buffer,
+which subsequent calls will overwrite.
+.PP
+The
+.BR ether_ntohost ()
+function maps an Ethernet address to the
+corresponding hostname in
+.I /etc/ethers
+and returns nonzero if it cannot be found.
+.PP
+The
+.BR ether_hostton ()
+function maps a hostname to the
+corresponding Ethernet address in
+.I /etc/ethers
+and returns nonzero if it cannot be found.
+.PP
+The
+.BR ether_line ()
+function parses a line in
+.I /etc/ethers
+format (ethernet address followed by whitespace followed by
+hostname; \[aq]#\[aq] introduces a comment) and returns an address
+and hostname pair, or nonzero if it cannot be parsed.
+The buffer pointed to by
+.I hostname
+must be sufficiently long, for example, have the same length as
+.IR line .
+.PP
+The functions
+.BR ether_ntoa_r ()
+and
+.BR ether_aton_r ()
+are reentrant
+thread-safe versions of
+.BR ether_ntoa ()
+and
+.BR ether_aton ()
+respectively, and do not use static buffers.
+.PP
+The structure
+.I ether_addr
+is defined in
+.I <net/ethernet.h>
+as:
+.PP
+.in +4n
+.EX
+struct ether_addr {
+    uint8_t ether_addr_octet[6];
+}
+.EE
+.in
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR ether_aton (),
+.BR ether_ntoa ()
+T}	Thread safety	MT-Unsafe
+T{
+.na
+.nh
+.BR ether_ntohost (),
+.BR ether_hostton (),
+.BR ether_line (),
+.BR ether_ntoa_r (),
+.BR ether_aton_r ()
+T}	Thread safety	MT-Safe
+.TE
+.sp 1
+.SH STANDARDS
+None.
+.SH HISTORY
+4.3BSD, SunOS.
+.SH BUGS
+In glibc 2.2.5 and earlier, the implementation of
+.BR ether_line ()
+.\" The fix was presumably commit c0a0f9a32c8baa6ab93d00eb42d92c02e9e146d7
+.\" which was in glibc 2.3
+is broken.
+.SH SEE ALSO
+.BR ethers (5)