if_nametoindex()
Map an interface name to its index
Synopsis:
#include <net/if.h>
unsigned int if_nametoindex( const char * ifname );
Arguments:
- ifname
- The interface name that you want to map.
Library:
libsocket
Use the -l socket option to qcc to link against this library.
Description:
The if_nametoindex() function maps the interface name specified by ifname to its corresponding index.
Returns:
The index number of the interface, or 0 if the specified interface couldn't be found or an error occurred while using getifaddrs() to retrieve the list of interfaces.
Classification:
| Safety: | |
|---|---|
| Cancellation point | Yes |
| Interrupt handler | No |
| Signal handler | No |
| Thread | Yes |