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 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;char ** p_aliases;int p_proto;};
The members of the protoent structure are:
p_nameThe official name of the protocol.
p_aliasesA zero terminated list of alternative names for the protocol.
p_protoThe protocol number.
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.
This page is part of release 2.79 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/.
|
Copyright 1993 David Metcalfe (davidprism.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 Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date.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 (faithcs.unc.edu) |