:man| Alphabetical   Categories   About us 
 
GETSERVENT (3) | C library functions | Unix Manual Pages | :man

NAME

getservent, getservbyport, getservbyname, setservent, endservent - get service entry

CONTENTS

Library
Synopsis
Description
Files
Diagnostics
See Also
History
Bugs

LIBRARY


.Lb libc

SYNOPSIS


.In netdb.h struct servent * getservent struct servent * getservbyname "const char *name" "const char *proto" struct servent * getservbyport "int port" "const char *proto" void setservent "int stayopen" void endservent void

DESCRIPTION

The getservent, getservbyname, and getservbyport functions each return a pointer to an object with the following structure containing the broken-out fields of a line in the network services data base, /etc/services.
struct servent {
char *s_name; /* official name of service */
char **s_aliases; /* alias list */
ints_port; /* port service resides at */
char *s_proto; /* protocol to use */
};

The members of this structure are:

s_name The official name of the service.
s_aliases
A zero terminated list of alternate names for the service.
s_port The port number at which the service resides. Port numbers are returned in network byte order.
s_proto The name of the protocol to use when contacting the service.

The getservent function reads the next line of the file, opening the file if necessary.

The setservent function opens and rewinds the file. If the stayopen flag is non-zero, the net data base will not be closed after each call to getservbyname or getservbyport.

The endservent function closes the file.

The getservbyname and getservbyport functions sequentially search from the beginning of the file until a matching protocol name or port number (which must be specified in network byte order) is found, or until EOF is encountered. If a protocol name is also supplied (non- NULL), searches must also match the protocol.

FILES

/etc/services

DIAGNOSTICS

Null pointer (0) returned on EOF or error.

SEE ALSO

getprotoent(3), services(5)

HISTORY

BUGS


Share this page

     Follow us

Facebook Twitter Google+ LinkedIn


 
Created by Blin Media, 2008-2013