@comment The start of a comment is indicated by the following comment. This
@comment syntax is used by the script funcstxh.sh: @comment function <name>

@comment function if_nametoindex

@node if_nametoindex, socket
@findex if_nametoindex

@subheading Syntax

@example
#include <net/if.h>

unsigned int if_nametoindex (const char *ifname);
@end example

@subheading Description

This returns the interface index corresponding to @var{ifname}.

@subheading Return Value

The interface index will be returned if @var{ifname} is an interface name,
else 0.  If an error occurs, -1 will be returned and the error will be stored
in @var{errno}.

Possible errors for this function are:

@table @samp
@item EFAULT
The name pointed to by @var{ifname} cannot be accessed.
@end table

@subheading Portability

Open Group XNS 5.2 Draft 1.0

@subheading Example

@example
@end example