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GETSERVENT(3)                       Linux Programmer's Manual                       GETSERVENT(3)



NAME
       getservent, getservbyname, getservbyport, setservent, endservent - get service entry

SYNOPSIS
       #include <netdb.h>

       struct servent *getservent(void);

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

       struct servent *getservbyport(int port, const char *proto);

       void setservent(int stayopen);

       void endservent(void);

DESCRIPTION
       The  getservent()  function  reads  the  next  entry  from the services database (see ser‐
       vices(5)) and returns a servent structure containing the broken-out fields from the entry.
       A connection is opened to the database if necessary.

       The  getservbyname()  function returns a servent structure for the entry from the database
       that matches the service name using protocol proto.  If proto is NULL, any  protocol  will
       be matched.  A connection is opened to the database if necessary.

       The  getservbyport()  function returns a servent structure for the entry from the database
       that matches the port port (given in network byte order) using protocol proto.   If  proto
       is  NULL,  any protocol will be matched.  A connection is opened to the database if neces‐
       sary.

       The setservent() function opens a connection to the database, and sets the next  entry  to
       the  first entry.  If stayopen is nonzero, then the connection to the database will not be
       closed between calls to one of the getserv*() functions.

       The endservent() function closes the connection to the database.

       The servent structure is defined in <netdb.h> as follows:

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

       The members of the servent structure are:

       s_name The official name of the service.

       s_aliases
              A NULL-terminated list of alternative names for the service.

       s_port The port number for the service given in network byte order.

       s_proto
              The name of the protocol to use with this service.

RETURN VALUE
       The getservent(), getservbyname() and getservbyport() functions  return  a  pointer  to  a
       statically  allocated servent structure, or NULL if an error occurs or the end of the file
       is reached.

FILES
       /etc/services
              services database file

CONFORMING TO
       4.3BSD, POSIX.1-2001.

SEE ALSO
       getnetent(3), getprotoent(3), getservent_r(3), services(5)

COLOPHON
       This page is part of release 3.74 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at http://www.kernel.org/doc/man-pages/.



GNU                                         2008-08-19                              GETSERVENT(3)


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