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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 dif-
       fer (consult the corresponding 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 indirectly 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 specified 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  pro-
       toent  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 subsequent 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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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)