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); |
DESCRIPTION
The 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 getprotobyname()
function returns a protoent structure for the
line from /etc/protocols that
matches the protocol name name.
The getprotobynumber()
function returns a protoent structure for the
line that matches the protocol number number.
The setprotoent() function
opens and rewinds the /etc/protocols file. If stayopen is true (1), then the
file will not be closed between calls to getprotobyname() or getprotobynumber().
The 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 getprotoent(),
getprotobyname() and
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.
SEE ALSO
getnetent(3), getservent(3), protocols(5)
Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.
Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date. The author(s) assume no
responsibility for errors or omissions, or for damages resulting from
the use of the information contained herein. The author(s) may not
have taken the same level of care in the production of this manual,
which is licensed free of charge, as they might when working
professionally.
Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.
References consulted:
Linux libc source code
Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
386BSD man pages
Modified Sat Jul 24 19:26:03 1993 by Rik Faith (faith@cs.unc.edu)
|
