NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | FILES | CONFORMING TO | SEE ALSO | COLOPHON
GETPROTOENT(3) Linux Programmer's Manual GETPROTOENT(3)
getprotoent, getprotobyname, getprotobynumber, setprotoent, endprotoent - get
protocol entry
#include <netdb.h>
struct protoent *getprotoent(void);
struct protoent *getprotobyname(const char *name);
struct protoent *getprotobynumber(int proto);
void setprotoent(int stayopen);
void endprotoent(void);
The getprotoent() function reads the next entry from the protocols database
(see protocols(5)) and returns a protoent structure containing the broken-out
fields from the entry. A connection is opened to the database if necessary.
The getprotobyname() function returns a protoent structure for the entry from
the database that matches the protocol name name. A connection is opened to
the database if necessary.
The getprotobynumber() function returns a protoent structure for the entry
from the database that matches the protocol number number. A connection is
opened to the database if necessary.
The setprotoent() function opens a connection to the database, and sets the
next entry to the first entry. If stayopen is non-zero, then the connection
to the database will not be closed between calls to one of the getproto*()
functions.
The endprotoent() function closes the connection to the database.
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 NULL-terminated list of alternative names for the protocol.
p_proto
The protocol number.
The getprotoent(), getprotobyname() and getprotobynumber() functions return a
pointer to a statically allocated protoent structure, or a NULL pointer if an
error occurs or the end of the file is reached.
/etc/protocols
protocol database file
4.3BSD, POSIX.1-2001.
getnetent(3), getprotent_r(3), getservent(3), protocols(5)
This page is part of release 3.23 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
GNU 2008-08-19 GETPROTOENT(3)