getnetbyname(3)getnetbyname(3)NAME
getnetbyname, getnetbyname_r - Get a network entry by name
SYNOPSIS
#include <netdb.h>
struct netent *getnetbyname(
const char *name );
[Tru64 UNIX] The following obsolete function is supported in order to
maintain backward compatibility with previous versions of the operating
system. You should not use it in new designs. int getnetbyname_r(
const char *name,
struct netent *net,
struct netent_data *net_data );
LIBRARY
Standard C Library (libc)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
getnetbyname(): XNS4.0, XNS5.0
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
PARAMETERS
Specifies the official network name or alias. [Tru64 UNIX] For get‐
netbyname_r() only, this points to the netent structure. The netdb.h
header file defines the netent structure. [Tru64 UNIX] For getnetby‐
name_r() only, this is data for the networks database. The netdb.h
header file defines the netent_data structure.
DESCRIPTION
The getnetbyname() function returns a pointer to a structure of type
netent. Its members specify data in fields from either the local
/etc/networks file or the NIS distributed network database. To deter‐
mine which file or files to search, and in which order, the system uses
the switches in the /etc/svc.conf file. The netdb.h header file
defines the netent structure.
The getnetbyname() function searches the networks file sequentially
until a match with the name parameter occurs. When EOF (End-of-File) is
reached without a match, an null pointer is returned by this function.
Use the endnetent() function to close the networks file.
NOTES
The getnetbyname() function returns a pointer to thread-specific data.
Subsequent calls to this or a related function from the same thread
overwrite this data.
[Tru64 UNIX] The getnetbyname_r() function is an obsolete reentrant
version of the getnetbyname() function. It is supported in order to
maintain backward compatibility with previous versions of the operat‐
ing system and should not be used in new designs. Note that you must
set the net_fp field of the netent_data structure to NULL before its
first access by either the setnetent_r() or getnetbyname_r() function.
You must initialize the _net_stayopen option of the netent_data struc‐
ture if you are not using the setnetent() function.
RETURN VALUES
Upon successful completion, the getnetbyname() function returns a
pointer to a netent structure. If it fails or reaches the end of the
/etc/networks name file, it returns a null pointer.
[Tru64 UNIX] Upon successful completion, the getnetbyname_r() function
stores the netent structure in the location pointed to by net, and
returns a value of 0 (zero). Upon failure, it returns a value of -1.
ERRORS
Current industry standards do not define error values for the getnetby‐
name() function.
[Tru64 UNIX] If any of the following conditions occurs, the getnetby‐
name_r() function sets errno to the corresponding value:
The net or net_data parameter is invalid. The search failed.
FILES
This file is the Internet network name database file. Each record in
the file occupies a single line and has three fields: the official net‐
work name, the network number, and alias.
SEE ALSO
Functions: endnetent(3), getnetent(3), getnetbyaddr(3), setnetent(3).
Files: networks(4), svc.conf(4).
Networks: nis_intro(7).
Standards: standards(5).
Network Programmer's Guide
getnetbyname(3)