| NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | FILES | CONFORMING TO | SEE ALSO | COLOPHON | The Linux Programming Interface |
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 nonzero, 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), getprotoent_r(3), getservent(3), protocols(5)
This page is part of release 3.32 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)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface