GETPROTOENT(3) Linux Programmer's Manual GETPROTOENT(3)NAME
getprotoent, getprotobyname, getprotobynumber, setprotoent, endprotoent
- get protocol entry
SYNOPSIS
#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);
DESCRIPTION
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 connecā
tion 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.
RETURN VALUE
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.
FILES
/etc/protocols
protocol database file
CONFORMING TO
4.3BSD, POSIX.1-2001.
SEE ALSOgetnetent(3), getprotent_r(3), getservent(3), protocols(5)COLOPHON
This page is part of release 3.15 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)