getservent, getservbyname, getservbyport, setservent, endservent — get service entry
#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); |
void
endservent( |
void); |
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;char ** s_aliases;int s_port;char * s_proto;};
The members of the servent structure are:
s_nameThe official name of the service.
s_aliasesA zero terminated list of alternative names for the service.
s_portThe port number for the service given in network byte order.
s_protoThe name of the protocol to use with this service.
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.
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 19:19:11 1993 by Rik Faith (faithcs.unc.edu) Modified Wed Oct 18 20:23:54 1995 by Martin Schulze <joeyinfodrom.north.de> Modified Mon Apr 22 01:50:54 1996 by Martin Schulze <joeyinfodrom.north.de> 2001-07-25 added a clause about NULL proto (Martin Michlmayr or David N. Welton) |