getservent(3N)                    SDK R4.11                   getservent(3N)


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

SYNOPSIS
       #include <netdb.h>

       struct servent *getservent()

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

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

       setservent(stayopen)
       int stayopen

       endservent()

DESCRIPTION
       Getservent, getservbyname, and getservbyport each return a pointer to
       an object with the following structure containing the broken-out
       fields of a line in the network services data base, /etc/services.

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

       The members of this structure are:

       s_name     The official name of the service.

       s_aliases  A zero terminated list of alternate names for the service.

       s_port     The port number at which the service resides.  Port
                  numbers are returned in network byte order.

       s_proto    The name of the protocol to use when contacting the
                  service.

       Getservent reads the next line of the file, opening the file if
       necessary.

       Setservent opens and rewinds the file.  If the stayopen flag is non-
       zero, the net data base will not be closed after each call to
       getservbyname or getservbyport.

       Endservent closes the file.

       Getservbyname and getservbyport sequentially search from the
       beginning of the file until a matching protocol name or port number
       is found, or until EOF is encountered.  If a protocol name is also
       supplied (non-NULL), searches must also match the protocol.

FILES
       /etc/services

SEE ALSO
       ypserv(1M), getprotoent(3N), services(4).

DIAGNOSTICS
       Null pointer (0) returned on EOF or error.

BUGS
       All information is contained in a static area so it must be copied if
       it is to be saved.  Expecting port numbers to fit in a 32 bit
       quantity is probably naive.


Licensed material--property of copyright holder(s)