Name
getservent, getservbyname, getservbyport, setservent,
endservent — get service entry
Synopsis
#include <netdb.h>
struct servent *getservent( |
void); |
|
struct servent *getservbyname( |
const char * |
name, |
| |
const char * |
proto); |
struct servent *getservbyport( |
int |
port, |
| |
const char * |
proto); |
void
setservent( |
int |
stayopen); |
DESCRIPTION
The getservent() function
reads the next line from the file /etc/services and returns a structure
servent containing
the broken out fields from the line. The /etc/services file is opened if
necessary.
The getservbyname() function
returns a servent
structure for the line from /etc/services that matches the service
name using protocol
proto. If proto is NULL, any protocol
will be matched.
The getservbyport() function
returns a servent
structure for the line that matches the port port given in network byte
order using protocol proto. If proto is NULL, any protocol
will be matched.
The setservent() function
opens and rewinds the /etc/services file. If stayopen is true (1), then the
file will not be closed between calls to getservbyname() and getservbyport().
The endservent() function
closes /etc/services.
The servent
structure is defined in <netdb.h> as
follows:
| struct |
servent { |
| |
char |
* |
s_name; |
/* official service name */ |
| |
char |
** |
s_aliases; |
/* alias list */ |
| |
int |
|
s_port; |
/* port number */ |
| |
char |
* |
s_proto; |
/* protocol to use */ |
| }; |
The members of the servent structure are:
s_name-
The official name of the service.
s_aliases-
A zero terminated list of alternative names for the
service.
s_port-
The port number for the service given in network
byte order.
s_proto-
The name of the protocol to use with this
service.
RETURN VALUE
The getservent(),
getservbyname() and
getservbyport() functions
return the servent
structure, or a NULL pointer if an error occurs or the end of
the file is reached.
FILES
/etc/services-
services database file
CONFORMING TO
4.3BSD, POSIX.1-2001.
SEE ALSO
getnetent(3), getprotoent(3), services(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 19:19:11 1993 by Rik Faith (faith@cs.unc.edu)
Modified Wed Oct 18 20:23:54 1995 by Martin Schulze <joey@infodrom.north.de>
Modified Mon Apr 22 01:50:54 1996 by Martin Schulze <joey@infodrom.north.de>
2001-07-25 added a clause about NULL proto (Martin Michlmayr or David N. Welton)
|
