getnetent(3)getnetent(3)NAME
getnetent, getnetent_r - Get a network entry
SYNOPSIS
#include <netdb.h>
struct netent *getnetent(
void );
[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 getnetent_r(
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:
getnetent(): XNS4.0, XNS5.0
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
PARAMETERS
[Tru64 UNIX] Points to the netent structure. The netdb.h header file
defines the netent structure. [Tru64 UNIX] Is data for the networks
database. The netdb.h header file defines the netent_data structure.
DESCRIPTION
The getnetent() function retrieves network information by opening and
sequentially reading either the local /etc/networks file or the NIS
distributed networks file for the requested information. To determine
which file or files to search, and in which order, the system uses the
switches in the /etc/svc.conf file.
The getnetent() function returns a pointer to a netent structure, which
contains the equivalent fields for a network description line in the
networks file. The netent structure is defined in the netdb.h header
file.
Use the endnetent() function to close the /etc/networks file.
The getnetent() return value points to static data, which is overwrit‐
ten by any subsequently called functions using the same structure.
NOTES
The getnetent() function returns a pointer to thread-specific data.
Subsequent calls to this function from the same thread overwrite this
data.
[Tru64 UNIX] The getnetent_r() function is an obsolete reentrant ver‐
sion of the getnetent() function. It is supported in order to main‐
tain 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 getnetent_r() function.
RETURN VALUES
Upon successful completion, the getnetent() function returns a pointer
to a netent structure. If it fails or reaches the end of the /etc/net‐
works name file, it returns a null pointer.
[Tru64 UNIX] Upon successful completion, the getnetent_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 getne‐
tent() function.
[Tru64 UNIX] If any of the following conditions occurs, the getne‐
tent_r() function sets errno to the corresponding value:
The netent or net_data parameter is invalid. The search failed (EOF).
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. The database service selec‐
tion configuration file.
SEE ALSO
Functions: getnetbyaddr(3), getnetbyname(3), setnetent(3), endne‐
tent(3).
Files: networks(4), svc.conf(4).
Networks: nis_intro(7).
Standards: standards(5).
Network Programmer's Guide
getnetent(3)
