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;char ** p_aliases;int p_proto;};
The members of the protoent structure are:
p_nameThe official name of the protocol.
p_aliasesA NULL-terminated list of alternative names for the protocol.
p_protoThe 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.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
getprotoent() |
Thread safety | MT-Unsafe race:protoent race:protoentbuf locale |
getprotobyname() |
Thread safety | MT-Unsafe race:protobyname locale |
getprotobynumber() |
Thread safety | MT-Unsafe race:protobynumber locale |
setprotoent(), endprotoent() |
Thread safety | MT-Unsafe race:protoent locale |
In the above table, protoent in race:protoent signifies that
if any of the functions setprotoent(), getprotoent(), or endprotoent() are used in parallel in
different threads of a program, then data races could
occur.
This page is part of release 5.11 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright 1993 David Metcalfe (davidprism.demon.co.uk) %%%LICENSE_START(VERBATIM) 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. %%%LICENSE_END 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) |