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 services(5)) and returns a servent struc-
       ture 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 neces-
       sary.

       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 necessary.

       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 struc-
       ture, or a NULL pointer 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 3.25 of the Linux man-pages project.  A description of the project,  and  information  about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                                                        2008-08-19                                              GETSERVENT(3)