GETPROTOENT(3N)     UNIX Programmer's Manual	  GETPROTOENT(3N)



NAME
     getprotoent, getprotobynumber, getprotobyname, setprotoent,
     endprotoent - get protocol entry

SYNOPSIS
     #include <netdb.h>

     struct protoent *getprotoent()

     struct protoent *getprotobyname(name)
     char *name;

     struct protoent *getprotobynumber(proto)
     int proto;

     setprotoent(stayopen)
     int stayopen

     endprotoent()

DESCRIPTION
     _G_e_t_p_r_o_t_o_e_n_t, _g_e_t_p_r_o_t_o_b_y_n_a_m_e, and _g_e_t_p_r_o_t_o_b_y_n_u_m_b_e_r each
     return a pointer to an object with the following structure
     containing the broken-out fields of a line in the network
     protocol data base, /_e_t_c/_p_r_o_t_o_c_o_l_s.

	  struct    protoent {
	       char *p_name;  /* official name of protocol */
	       char **p_aliases;   /* alias list */
	       int  p_proto;  /* protocol number */
	  };

     The members of this structure are:

     p_name	The official name of the protocol.

     p_aliases	A zero terminated list of alternate names for the
		protocol.

     p_proto	The protocol number.

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

     _S_e_t_p_r_o_t_o_e_n_t opens and rewinds the	file.	If  the  _s_t_a_y_o_p_e_n
     flag is non-zero, the net data base will not be closed after
     each call to _g_e_t_p_r_o_t_o_b_y_n_a_m_e or _g_e_t_p_r_o_t_o_b_y_n_u_m_b_e_r.

     _E_n_d_p_r_o_t_o_e_n_t closes the file.

     _G_e_t_p_r_o_t_o_b_y_n_a_m_e and _g_e_t_p_r_o_t_o_b_y_n_u_m_b_e_r sequentially search from
     the  beginning of the file until a matching protocol name or



Printed 11/26/99	  May 19, 1986				1






GETPROTOENT(3N)     UNIX Programmer's Manual	  GETPROTOENT(3N)



     protocol number is found, or until EOF is encountered.

FILES
     /etc/protocols

SEE ALSO
     protocols(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.  Only the Internet protocols
     are currently understood.








































Printed 11/26/99	  May 19, 1986				2