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getprotoent(3)
NAME
  getprotoent, getprotoent_r - Get a protocol entry

SYNOPSIS
  #include <netdb.h>

  struct protoent *getprotoent(
	  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 getprotoent_r(
	  struct protoent *proto,
	  struct protoent_data *proto_data );

LIBRARY
  Standard C Library (libc)

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

  getprotoent():  XNS4.0, XNS5.0

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

PARAMETERS
  proto
      [Tru64 UNIX]  For getprotoent_r(), points to the protoent structure.
      The netdb.h header file defines the protoent structure.

  proto_data
      [Tru64 UNIX]  For getprotoent_r(), is data for the protocols database.
      Thenetdb.h header file defines the protoent_data structure.

DESCRIPTION
  The getprotoent() (get protocol entry) function retrieves protocol
  information from either the local /etc/protocols 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 getprotoent() function returns a pointer to a protoent structure, which
  contains the fields for a line of information in the networks protocols
  database file.  The netdb.h header file defines the protoent structure.

  An application program can use the getprotoent() function to access a
  protocol name, its aliases, and protocol number. Use the endprotoent()
  function to close the /etc/protocols file.  Use the setprotoent() function
  to rewind.

NOTES
  The getprotoent() 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 getprotoent_r() function is an obsolete reentrant version
  of the getprotoent() 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 zero-fill the
  proto_data structure before its first access by either the setprotoent_r()
  or getprotoent_r() function.	When using the getprotoent_r() function, use
  the setprotoent_r() function to rewind the network protocols database file
  and the endprotoent_r() function to close it.

RETURN VALUES
  Upon successful completion, the getprotoent() function returns a pointer to
  a protoent structure.	 If it fails or reaches the end of the network
  protocols database file, it returns a null pointer.

  [Tru64 UNIX]	Upon successful completion, the getprotoent_r() function
  stores the protoent structure in the location pointed to by proto, and
  returns a value of 0 (zero).	Otherwise it returns a value of -1.

ERRORS
  Current industry standards do not define error values for the getprotoent()
  function.

  [Tru64 UNIX]	If any of the following conditions occurs, the
  getprotoent_r() function sets errno to the corresponding value:

  [EINVAL]
      The proto or proto_data parameter is invalid.

  [ESRCH]
      The search failed.

  In addition, if the getprotoent() or getprotoent_r() function fails to open
  the file, it sets errno to indicate the cause of the failure.

FILES
  /etc/protocols
      Contains protocol information.

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

SEE ALSO
  Functions: getprotobynumber(3), getprotobyname(3), setprotoent(3),
  endprotoent(3).

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

  Networks: nis_intro(7).

  Standards: standards(5).

  Network Programmer's Guide

Index for Section 3

Alphabetical listing for G

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