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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 necessary.

       The  setservent()  function  opens  a connection to the database, and sets the next
       entry to the first entry.  If stayopen is non-zero,  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 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 3.22 of the Linux man-pages project.  A description of
       the project, and information about reporting bugs, can be found at  http://www.ker-
       nel.org/doc/man-pages/.



GNU                               2008-08-19                     GETSERVENT(3)

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