getprotoent
NAME
getprotoent, getprotobyname, getprotobynumber, setprotoent,
endprotoent - get protocol entry
SYNOPSIS
#include <netdb.h> struct protoent *getprotoent(void); I struct protoent *getprotobyname(const char * name ); I struct protoent *getprotobynumber(int proto ); I void setprotoent(int stayopen ); void endprotoent(void);
DESCRIPTION
The
R getprotoent ()
function reads the next line from the file
/etc/protocols and returns a structure protoent
containing the broken out fields from the line.
The /etc/protocols file is opened if necessary.
The
R getprotobyname ()
function returns a protoent
structure for the line from /etc/protocols that matches
the protocol name name.
The
R getprotobynumber ()
function returns a protoent
structure for the line that matches the protocol number number.
The
R setprotoent ()
function opens and rewinds the
/etc/protocols file.
If stayopen is true (1), then
the file will not be closed between calls to
R getprotobyname ()
or
R getprotobynumber ().
The
R endprotoent ()
function closes /etc/protocols.
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
R getprotoent (),
R getprotobyname ()
and
R getprotobynumber ()
functions return the protoent structure, or a NULL pointer if an
error occurs or the end of the file is reached.
FILES
/etc/protocols
protocol database file
CONFORMING TO
4.3BSD, POSIX.1-2001.
ČLÁNKY DO MAILU