The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

NAME

if_indextoname - map a network interface index to its corresponding name

SYNOPSIS

#include <net/if.h>

char *if_indextoname(unsigned ifindex, char *ifname);

DESCRIPTION

The if_indextoname() function shall map an interface index to its corresponding name.

When this function is called, ifname shall point to a buffer of at least {IF_NAMESIZE} bytes. The function shall place in this buffer the name of the interface with index ifindex.

RETURN VALUE

If ifindex is an interface index, then the function shall return the value supplied in ifname, which points to a buffer now containing the interface name. Otherwise, the function shall return a NULL pointer and set errno to indicate the error.

ERRORS

The if_indextoname() function shall fail if:

[ENXIO]
The interface does not exist.
The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

getsockopt(), if_freenameindex(), if_nameindex(), if_nametoindex(), setsockopt(), the Base Definitions volume of IEEE Std 1003.1-2001, <net/if.h>

CHANGE HISTORY

First released in Issue 6. Derived from the XNS, Issue 5.2 specification.

IEEE Std 1003.1-2001/Cor 1-2002, item XSH/TC1/D6/28 is applied, changing {IFNAMSIZ} to {IF_NAMESIZ} in the DESCRIPTION.

End of informative text.
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