GETPROTOENT(3N)GETPROTOENT(3N)NAME
getprotoent, getprotobynumber, getprotobyname, setprotoent, endprotoent
- get protocol entry
SYNOPSIS
#include <netdb.h>
struct protoent *getprotoent()
struct protoent *getprotobyname(name)
char *name;
struct protoent *getprotobynumber(proto)
int proto;
setprotoent(stayopen)
int stayopen
endprotoent()DESCRIPTION
Getprotoent, getprotobyname, and getprotobynumber each return a pointer
to an object with the following structure containing 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.
Getprotoent reads the next line of the file, opening the file if
necessary.
Setprotoent 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.
Endprotoent closes the file.
Getprotobyname 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.
FILES
/etc/protocols
SEE ALSOprotocols(5)DIAGNOSTICS
Null pointer (0) returned on EOF or error.
BUGS
All information is contained in a static area so it must be copied if
it is to be saved. Only the Internet protocols are currently
understood.
4.2 Berkeley Distribution May 19, 1986 GETPROTOENT(3N)