GETPROTOENT(3) MachTen Programmer’s Manual GETPROTOENT(3)

NAME
getprotoent, getprotobynumber, getprotobyname, setprotoent, endprotoent -
get protocol entry

SYNOPSIS
#include <netdb.h>

struct protoent *
getprotoent()

struct protoent *
getprotobyname(char *name)

struct protoent *
getprotobynumber(int proto)

setprotoent(int stayopen)

endprotoent()

DESCRIPTION
The getprotoent(), getprotobyname(), and getprotobynumber() functions
each return a pointer to an object with the following structure contain-
ing the broken-out fields of a line in the network protocol data base,
/etc/protocols.

struct protoent {
char *p_name; /* official name of protocol */
char **p_aliases; /* alias list */
int p_proto; /* protocol number */
};

The members of this structure are:

p_name The official name of the protocol.

p_aliases A zero terminated list of alternate names for the protocol.

p_proto The protocol number.

The getprotoent() function reads the next line of the file, opening the
file if necessary.

The setprotoent() function opens and rewinds the file. If the stayopen
flag is non-zero, the net data base will not be closed after each call to
getprotobyname() or getprotobynumber().

The endprotoent() function closes the file.

The getprotobyname() function and getprotobynumber() sequentially search
from the beginning of the file until a matching protocol name or protocol
number is found, or until EOF is encountered.

RETURN VALUES
Null pointer (0) returned on EOF or error.

FILES
/etc/protocols