suse man page for getprotobyname

ENDPROTOENT(3P) 					     POSIX Programmer's Manual						   ENDPROTOENT(3P)

PROLOG
       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME
       endprotoent, getprotobyname, getprotobynumber, getprotoent, setprotoent - network protocol database functions

SYNOPSIS
       #include <netdb.h>

       void endprotoent(void);
       struct protoent *getprotobyname(const char *name);
       struct protoent *getprotobynumber(int proto);
       struct protoent *getprotoent(void);
       void setprotoent(int stayopen);

DESCRIPTION
       These functions shall retrieve information about protocols. This information is considered to be stored in a database that can be  accessed
       sequentially or randomly. The implementation of this database is unspecified.

       The  setprotoent() function shall open a connection to the database, and set the next entry to the first entry. If the stayopen argument is
       non-zero, the connection to the network protocol database shall not be closed after each call to getprotoent() (either directly,  or  indi-
       rectly through one of the other getproto*() functions), and the implementation may maintain an open file descriptor for the database.

       The  getprotobyname()  function shall search the database from the beginning and find the first entry for which the protocol name specified
       by name matches the p_name member, opening and closing a connection to the database as necessary.

       The getprotobynumber() function shall search the database from the beginning and find the first entry for which the protocol number  speci-
       fied by proto matches the p_proto member, opening and closing a connection to the database as necessary.

       The getprotoent() function shall read the next entry of the database, opening and closing a connection to the database as necessary.

       The  getprotobyname(),  getprotobynumber(), and getprotoent() functions shall each return a pointer to a protoent structure, the members of
       which shall contain the fields of an entry in the network protocol database.

       The endprotoent() function shall close the connection to the database, releasing any open file descriptor.

       These functions need not be reentrant. A function that is not required to be reentrant is not required to be thread-safe.

RETURN VALUE
       Upon successful completion, getprotobyname(), getprotobynumber(), and getprotoent() return  a  pointer  to  a  protoent	structure  if  the
       requested  entry  was  found,  and a null pointer if the end of the database was reached or the requested entry was not found. Otherwise, a
       null pointer is returned.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The getprotobyname(), getprotobynumber(), and getprotoent() functions may return pointers to static data, which may be overwritten by  sub-
       sequent calls to any of these functions.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       The Base Definitions volume of IEEE Std 1003.1-2001, <netdb.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
       and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003							   ENDPROTOENT(3P)