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NAME
getprotobyname, getprotobynumber - get protocol entry
SYNOPSIS
#include <network.h>
struct protoent *getprotobyname(const char *name);
struct protoent *getprotobynumber(int proto);
DESCRIPTION
The getprotobyname() function returns a protoent structure
for the line from /etc/protocols that matches the protocol
name name.
The getprotobynumber() function returns a protoent struc
ture for the line that matches the protocol number number.
The protoent structure is defined in <netdb.h> as follows:
struct protoent {
char *p_name; /* official protocol name */
char **p_aliases; /* alias list */
int p_proto; /* protocol number */
}
The members of the protoent structure are:
p_name The official name of the protocol.
p_aliases
A zero terminated list of alternative names for the
protocol.
p_proto
The protocol number.
RETURN VALUE
The getprotobyname() and getprotobynumber()
functions return the protoent structure, or a NULL pointer
if an error occurs.
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