4.3BSD - /usr/man/cat3/getservent.0

GETSERVENT(3N)                                                  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  neces‐
       sary.

       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  get���
       servbyname or .IR 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
       getprotoent(3N), services(5)

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.


4.2 Berkeley Distribution        May 19, 1986                   GETSERVENT(3N)