Comtrol eCos User Manual
Page 528
Chapter 38. TCP/IP Library Reference
getprotoent(void);
struct protoent *
getprotobyname(char *name);
struct protoent *
getprotobynumber(int proto);
void
setprotoent(int stayopen);
void
endprotoent(void);
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 database,
/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 database will not be closed after each call to
getprotobyname() or getprotobynumber().
The endprotoent() function closes the file.
The getprotobyname() and getprotobynumber() functions 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
SEE ALSO
424