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.

structprotoent {
char*p_name;/* official name of protocol */
char**p_aliases;/* alias list */
intp_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 ALSO

protocols(4)

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. 

NOTE

There are two versions of the primitives documented in this manual entry:  a vanilla version and a Yellow Pages version.  The programmatic interface of both versions is identical.  The vanilla version gets its information from an ASCII file in /etc. The Yellow Pages version knows about Sun’s Yellow Pages distributed lookup service. If you want the Yellow Pages version, link the program according to the instructions for (3Y) primitives as described in intro(3). Refer to ypserv(1M) and the NFS User’s Guide for more information about the Yellow Pages. 

Version 3.6  —  December 20, 1987