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ENDSERVENT(P)		   POSIX Programmer's Manual		 ENDSERVENT(P)

NAME
       endservent, getservbyname, getservbyport, getservent, setservent - net‐
       work services database functions

SYNOPSIS
       #include <netdb.h>

       void endservent(void);
       struct servent *getservbyname(const char *name, const char *proto);
       struct servent *getservbyport(int port, const char *proto);
       struct servent *getservent(void);
       void setservent(int stayopen);

DESCRIPTION
       These functions shall  retrieve	information  about  network  services.
       This  information  is considered to be stored in a database that can be
       accessed sequentially or randomly. The implementation of this  database
       is unspecified.

       The  setservent() function shall open a connection to the database, and
       set the next entry to the first entry. If the stayopen argument is non-
       zero,  the net database shall not be closed after each call to the get‐
       servent() function (either directly, or indirectly through one  of  the
       other  getserv*()  functions),  and  the implementation may maintain an
       open file descriptor for the database.

       The getservent() function shall read the next entry  of	the  database,
       opening and closing a connection to the database as necessary.

       The  getservbyname() function shall search the database from the begin‐
       ning and find the first entry for which the service name	 specified  by
       name matches the s_name member and the protocol name specified by proto
       matches the s_proto member, opening and closing	a  connection  to  the
       database	 as  necessary.	 If  proto is a null pointer, any value of the
       s_proto member shall be matched.

       The getservbyport() function shall search the database from the	begin‐
       ning  and  find	the  first  entry for which the port specified by port
       matches the s_port member and the  protocol  name  specified  by	 proto
       matches	the  s_proto  member,  opening and closing a connection to the
       database as necessary. If proto is a null pointer,  any	value  of  the
       s_proto	member shall be matched. The port argument shall be in network
       byte order.

       The getservbyname(), getservbyport(), and getservent() functions	 shall
       each  return  a	pointer	 to  a servent structure, the members of which
       shall contain the fields of an entry in the network services database.

       The endservent() function shall close the database, releasing any  open
       file descriptor.

       These  functions need not be reentrant. A function that is not required
       to be reentrant is not required to be thread-safe.

RETURN VALUE
       Upon successful completion, getservbyname(), getservbyport(), and  get‐
       servent()  return  a  pointer  to  a servent structure if the requested
       entry was found, and a null pointer if the  end	of  the	 database  was
       reached or the requested entry was not found. Otherwise, a null pointer
       is returned.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The port argument of getservbyport() need not be	 compatible  with  the
       port values of all address families.

       The  getservbyname(),  getservbyport(),	and getservent() functions may
       return pointers to static data, which may be overwritten by  subsequent
       calls to any of these functions.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       endhostent() , endprotoent() , htonl() , inet_addr() , the Base Defini‐
       tions volume of IEEE Std 1003.1-2001, <netdb.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			 ENDSERVENT(P)
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