Index for Section 3

Alphabetical listing for G

getnetent(3)
NAME
  getnetent, getnetent_r - Get a network entry

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

SYNOPSIS
  #include <netdb.h>

  struct netent *getnetent(void);

  [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 getnetent_r(
	  struct netent *net,
	  struct netent_data *net_data);

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

  getnetent():	XPG4-UNIX

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

PARAMETERS
  net	    [Digital]  Points to the netent structure.	The netdb.h header
	    file defines the netent structure.

  net_data  [Digital]  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 overwritten 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.

  [Digital]  The getnetent_r() function is an obsolete reentrant version of
  the getnetent() 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 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/networks name
  file, it returns a null pointer.

  [Digital]  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 getnetent()
  function.

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

  [EINVAL]  The netent or net_data parameter is invalid.

  [ESRCH]   The search failed (EOF).

FILES
  /etc/networks
	    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.

  /etc/svc.conf
	    The database service selection configuration file.

RELATED INFORMATION
  Functions: getnetbyaddr(3), getnetbyname(3), setnetent(3), endnetent(3).

  Files: networks, svc.conf(4).

  Networks: nis_intro(7).

  Standards: standards(5).