getprotobyname(3)					     Library Functions Manual						 getprotobyname(3)

NAME

       getprotobyname, getprotobyname_r - Get a protocol entry by protocol name

LIBRARY

       Standard C Library (libc.so, libc.a)

SYNOPSIS

       #include <netdb.h>

       struct protoent *getprotobyname(      const char *name);

       [Tru64  UNIX]  The following obsolete function is supported in order to maintain backward compatibility with previous versions of the oper-
       ating system.  You should not use it in new designs.  int getprotobyname_r(	const char *name,      struct protoent *proto,	    struct
       protoent_data *proto_data);

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       getprotobyname():  XNS4.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies the official protocol name or alias.  [Tru64 UNIX]  For getprotobyname_r(), points to the protoent structure.	The netdb.h header
       file defines the protoent structure.  [Tru64 UNIX]  For getprotobyname_r(), is data for the protocols database.	The  netdb.h  header  file
       defines the protoent_data structure.

DESCRIPTION

       The  getprotobyname()  function returns a pointer to a structure of type protoent. Its members specify data in fields from a record line in
       either the local /etc/protocols file or the NIS network protocols database file. To determine which file or files to search, and  in  which
       order, the system uses the switches in the /etc/svc.conf file.  The netdb.h header file defines the protoent structure.

       The  getprotobyname()  function searches the network protocols database file sequentially until a match with the name parameter occurs. The
       name parameter will specify either the official protocol name or an alias. When EOF (End-of-File) is reached  without  a  match,  an  error
       value is returned by this function.

       When using the getprotobyname() function, use the endprotoent() function to close the protocols file.

NOTES

       The  getprotobyname()  function	returns  a  pointer to thread-specific data.  Subsequent calls to this or a related function from the same
       thread overwrite this data.

       [Tru64 UNIX]  The getprotobyname_r() function is an obsolete reentrant version of the getprotobyname() function. It is supported  in  order
       to  maintain  backward  compatibility  with previous versions of the operating system and should not be used in new designs.  Note that you
       must zero-fill the proto_data structure before its first access by either the setprotoent_r() or getprotobyname_r() function.

RETURN VALUES

       Upon successful completion, the getprotobyname() function returns a pointer to a protoent structure.  If it fails or reaches the end of the
       network protocols database file, it returns a null pointer.

       [Tru64  UNIX]  Upon  successful	completion,  the  getprotobyname_r()  function stores the protoent structure in the location pointed to by
       proto, and returns a value of 0 (zero).	Upon failure, it returns a value of -1.

ERRORS

       Current industry standards do not define error values for the getprotobyname() function.

       [Tru64 UNIX]  If any of the following conditions occurs, the getprotobyname_r() function sets errno to the corresponding value:

       The proto_data or proto parameter is invalid.  The search failed.

       In addition, if the getprotobyname() or getprotobyname_r() function fail to open the file, it sets errno to indicate the cause of the fail-
       ure.

FILES

       The DARPA Internet network protocols name database file.  Each record in the file occupies a single line and has three fields: the official
       protocol name, the protocol number, and protocol aliases.  The database service selection configuration file.

RELATED INFORMATION

       Functions: getprotobynumber(3), getprotoent(3), setprotoent(3), endprotoent(3).

       Files: protocols(4), svc.conf(4)

       Networks: nis_intro(7)

       Standards: standards(5) delim off

																 getprotobyname(3)