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getservent(3)							 getservent(3)

       getservent, getservent_r - Get a services file entry from the /etc/ser‐
       vices file.

       #include <netdb.h>

       struct servent *getservent(
	       void );

       [Tru64 UNIX]  The following obsolete function  is  supported  only  for
       backward	 compatibility	reasons. You should not use it in new designs.
       int getservent_r(
	       struct servent *serv,
	       struct servent_data *serv_data );

       Standard C Library (libc)

       Interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       getservent(): XNS4.0, XNS5.0

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

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

       The  getservent() (get service entry) function opens and reads the next
       line of either the local /etc/services file or the NIS distributed ser‐
       vices  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.

       An  application	program	 can use the getservent() function to retrieve
       information about network services and the protocol ports they use.

       The getservent() function returns a pointer  to	a  servent  structure,
       which  contains	fields for a line of information from the network ser‐
       vices database file.  The servent structure is defined in  the  netdb.h
       header file as follows:

       struct  servent {
	       char    *s_name;	       /* official service name */
	       char    **s_aliases;    /* alias list */
	       int     s_port;	       /* port # */
	       char    *s_proto;       /* protocol to use */ };

       The  network  services  database	 file remains open after a call by the
       getservent() function.  Use the endservent() function to close the net‐
       work services database file.  Use the setservent() function to rewind.

       The  getservent()  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 getservent_r() function is an obsolete reentrant ver‐
       sion of the getservent()	 function  and	should	not  be	 used  in  new
       designs. Note that you must zero-fill the servent_data structure before
       its first access by the getservent_r() function.

       Upon successful completion, the getservent() 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  getservent_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.

       Current industry standards do not define error values for  the  getser‐
       vent() function.

       [Tru64  UNIX]  If  any  of the following conditions occurs, the getser‐
       vent_r() function sets errno to the corresponding value:	 The  serv  or
       serv_data parameter is invalid.	The search failed.

       [Tru64  UNIX]  In  addition, if the function fails to open the file, it
       sets errno to indicate the cause of the failure.

       The Internet network service name database file.	 Each  record  in  the
       file  occupies  a single line and has four fields: the official service
       name, the port number, the protocol name, and  aliases.	 The  database
       service selection configuration file.

       Functions:  getservbyport(3),  getservbyname(3), endservent(3), setser‐

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

       Networks: nis_intro(7)

       Standards: standards(5)

       Network Programmer's Guide


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