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>LINK_ADDR(3) System Library Functions Manual LINK_ADDR(3)
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>LINK_ADDR(3) System Library Functions Manual LINK_ADDR(3)
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NAME
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NAME
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link_addr, link_ntoa - elementary address specification routines for link
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link_addr, link_ntoa - elementary address specification routines for link
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level access
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level access
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SYNOPSIS
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SYNOPSIS
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/socket.h>
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#include <net/if_dl.h>
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#include <net/if_dl.h>
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void
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void
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link_addr(const char *addr, struct sockaddr_dl *sdl);
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link_addr(const char *addr, struct sockaddr_dl *sdl);
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char *
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char *
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link_ntoa(const struct sockaddr_dl *sdl);
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link_ntoa(const struct sockaddr_dl *sdl);
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DESCRIPTION
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DESCRIPTION
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The link_addr() function interprets character strings representing link-
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The link_addr() function interprets character strings representing link-
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level addresses, returning binary information suitable for use in system
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level addresses, returning binary information suitable for use in system
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calls. link_ntoa() takes a link-level address and returns an ASCII
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calls. link_ntoa() takes a link-level address and returns an ASCII
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string representing some of the information present, including the link
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string representing some of the information present, including the link
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level address itself, and the interface name or number, if present. This
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level address itself, and the interface name or number, if present. This
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facility is experimental and is still subject to change.
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facility is experimental and is still subject to change.
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For link_addr(), the string addr may contain an optional network inter-
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For link_addr(), the string addr may contain an optional network inter-
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face identifier of the form ``name unit-number'', suitable for the first
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face identifier of the form ``name unit-number'', suitable for the first
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argument to ifconfig(8), followed in all cases by a colon and an inter-
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argument to ifconfig(8), followed in all cases by a colon and an inter-
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face address in the form of groups of hexadecimal digits separated by
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face address in the form of groups of hexadecimal digits separated by
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periods. Each group represents a byte of address; address bytes are
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periods. Each group represents a byte of address; address bytes are
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filled left to right from low order bytes through high order bytes.
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filled left to right from low order bytes through high order bytes.
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Thus le0:8.0.9.13.d.30 represents an Ethernet address to be transmitted
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Thus le0:8.0.9.13.d.30 represents an Ethernet address to be transmitted
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on the first Lance Ethernet interface.
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on the first Lance Ethernet interface.
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RETURN VALUES
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RETURN VALUES
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link_ntoa() always returns a null-terminated string. link_addr() has no
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link_ntoa() always returns a null-terminated string. link_addr() has no
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return value. (See BUGS.)
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return value. (See BUGS.)
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SEE ALSO
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SEE ALSO
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iso(4), ifconfig(8)
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iso(4), ifconfig(8)
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HISTORY
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HISTORY
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The link_addr() and link_ntoa() functions appeared in 4.3BSD-Reno.
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The link_addr() and link_ntoa() functions appeared in 4.3BSD-Reno.
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BUGS
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BUGS
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The returned values for link_ntoa reside in a static memory area.
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The returned values for link_ntoa reside in a static memory area.
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The function link_addr() should diagnose improperly formed input, and
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The function link_addr() should diagnose improperly formed input, and
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there should be an unambiguous way to recognize this.
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there should be an unambiguous way to recognize this.
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If the sdl_len field of the link socket address sdl is 0, link_ntoa()
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If the sdl_len field of the link socket address sdl is 0, link_ntoa()
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will not insert a colon before the interface address bytes. If this
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will not insert a colon before the interface address bytes. If this
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translated address is given to link_addr() without inserting an initial
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translated address is given to link_addr() without inserting an initial
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colon, the latter will not interpret it correctly.
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colon, the latter will not interpret it correctly.
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BSD July 28, 1993 BSD
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BSD July 28, 1993 BSD
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