Content-type: text/html Man page of getnetbyname

getnetbyname

Section: C Library Functions (3)
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NAME

getnetbyname, getnetbyname_r - Get a network entry by name  

LIBRARY

Standard C Library (libc.so, libc.a)  

SYNOPSIS

#include <netdb.h>

struct netent *getnetbyname(        const char *name);

[Digital]  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);
 

STANDARDS

Interfaces documented on this reference page conform to industry standards as follows:

getnetbyname(): XPG4-UNIX

Refer to the standards(5) reference page for more information about industry standards and associated tags.  

PARAMETERS

Specifies the official network name or alias. [Digital]  For getnetbyname_r() only, this points to the netent structure. The netdb.h header file defines the netent structure. [Digital]  For getnetbyname_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 determine 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.

[Digital]  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 operating 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 flag of the netent_data structure 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.

[Digital]  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 getnetbyname() function.

[Digital]  If any of the following conditions occurs, the getnetbyname_r() function sets errno to the corresponding value:

The net or net_data parameter is invalid. The search failed.  

FILES

This file is the DARPA Internet network name database file. Each record in the file occupies a single line and has three fields: the official network name, the network number, and alias.  

RELATED INFORMATION

Functions: endnetent(3), getnetent(3), getnetbyaddr(3), setnetent(3).

Files: networks(4), svc.conf(4).

Networks: nis_intro(7).

Standards: standards(5). delim off


 

Index

NAME
LIBRARY
SYNOPSIS
STANDARDS
PARAMETERS
DESCRIPTION
NOTES
RETURN VALUES
ERRORS
FILES
RELATED INFORMATION

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Time: 02:40:47 GMT, October 02, 2010