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NAME

       getprotobyname,  getprotobynumber - get protocol entry

SYNOPSIS

       #include <network.h>

       struct protoent *getprotobyname(const char *name);

       struct protoent *getprotobynumber(int proto);

DESCRIPTION

       The getprotobyname() function returns a protoent structure

       for the line from /etc/protocols that matches the protocol

       name name.

       The  getprotobynumber() function returns a protoent struc­

       ture for the line that matches the protocol number number.

       The protoent structure is defined in <netdb.h> as follows:

              struct protoent {

                      char    *p_name;        /* official protocol name */

                      char    **p_aliases;    /* alias list */

                      int     p_proto;        /* protocol number */

              }

       The members of the protoent structure are:

       p_name The official name of the protocol.

       p_aliases

              A zero terminated list of alternative names for the

              protocol.

       p_proto

              The protocol number.

RETURN VALUE

       The getprotobyname() and getprotobynumber()

       functions return the protoent structure, or a NULL pointer

       if an error occurs.