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getservbyname(3)
NAME
  getservbyname, getservbyname_r - Get a service entry by name

SYNOPSIS
  #include <netdb.h>

  struct servent *getservbyname(
	  const char *name,
	  const char *proto  );

  [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 getservbyname_r(
	  const char *name,
	  const char *proto,
	  struct servent *serv,
	  struct servent_data *serv_data );

LIBRARY
  Standard C Library (libc)

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

  getservbyname():  XNS4.0, XNS5.0

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

PARAMETERS
  name
      Specifies the official name or alias name of the service.

  proto
      Specifies the name of the protocol to use when contacting the service.

  serv
      [Tru64 UNIX]  For getservbyname_r() only, this points to the servent
      structure.  The netdb.h header file defines the servent structure.

  serv_data
      [Tru64 UNIX]  For getservbyname_r() only, this is data for the services
      database.	 The netdb.h header file defines the servent_data structure.

DESCRIPTION
  The getservbyname() function returns a pointer to a structure of type
  servent. Its members specify data in fields from a record line in either
  the local /etc/services file or the NIS distributed network services
  database file. 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 servent structure.

  The getservbyname() function searches the network services database file
  sequentially until a match with the name parameter and with the proto
  parameter occurs. The name parameter can specify either the official name
  or its alias. When EOF (End-of-File) is reached without the match, a null
  pointer is returned by this subroutine. When the protocol name is not
  specified (proto parameter is NULL), the proto parameter need not be
  matched during the network services database file record search.

  Use the endservent() function to close the network services database file.

NOTES
  The getservbyname() 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 getservbyname_r() function is an obsolete reentrant
  version of the getservbyname() 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 servent_data structure before its first access by either the
  setservent_r() or getservbyname_r() function.

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

  [Tru64 UNIX]	Upon successful completion, the getservbyname_r() function
  stores the servent structure in the location pointed to by serv, and
  returns a value of 0 (zero).	Upon failure, it returns a value of -1.

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

  [EINVAL]
      The serv or serv_data parameter is invalid.

  [ESRCH]
      The search failed.

  In addition, if the function fails to open the file, it sets errno to
  indicate the cause of the failure.

FILES
  /etc/services
      The Internet network service-name database. Each record in the file
      occupies a single line and has four fields: the official service name,
      the port reference, protocol name, and aliases.

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

SEE ALSO
  Functions: getservbyport(3), getservent(3), setservent(3), endservent(3).

  Files: services(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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