Comtrol eCos - Manual (Page 532)

Chapter 38. TCP/IP Library Reference
The getservent() function reads the next line of the file, opening the
file if necessary.
The setservent() function opens and rewinds the file. If the stayopen
flag is non-zero, the net database will not be closed after each call to
getservbyname() or getservbyport().
The endservent() function closes the file.
The getservbyname() and getservbyport() functions sequentially search
from the beginning of the file until a matching protocol name or port
number (specified in network byte order) is found, or until EOF is
encountered. If a protocol name is also supplied (non-null), searches
must also match the protocol.
FILES
/etc/services
DIAGNOSTICS
Null pointer (0) returned on EOF or error.
SEE ALSO
getprotoent(3), services(5)
HISTORY
The getservent(), getservbyport(), getservbyname(), setservent(), and
endservent() functions appeared in 4.2BSD.
BUGS
These functions use static data storage; if the data is needed for future
use, it should be copied before any subsequent calls overwrite it.
Expecting port numbers to fit in a 32-bit quantity is probably naive.
BSD January 12, 1994 BSD
if_nametoindex
IF_NAMETOINDEX(3) System Library Functions Manual IF_NAMETOINDEX(3)
NAME
if_nametoindex, if_indextoname, if_nameindex, if_freenameindex - convert
interface index to name, and vice versa
SYNOPSIS
#include < net/if.h>
unsigned int
if_nametoindex(const char *ifname);
char *
if_indextoname(unsigned int ifindex, char *ifname);
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