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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "ENDPROTOENT" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" endprotoent 
+.SH NAME
+endprotoent, getprotobyname, getprotobynumber, getprotoent, setprotoent
+\- network protocol database
+functions
+.SH SYNOPSIS
+.LP
+\fB#include <netdb.h>
+.br
+.sp
+void endprotoent(void);
+.br
+struct protoent *getprotobyname(const char *\fP\fIname\fP\fB);
+.br
+struct protoent *getprotobynumber(int\fP \fIproto\fP\fB);
+.br
+struct protoent *getprotoent(void);
+.br
+void setprotoent(int\fP \fIstayopen\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+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.
+.LP
+The \fIsetprotoent\fP() function shall open a connection to the database,
+and set the next entry to the first entry. If the
+\fIstayopen\fP argument is non-zero, the connection to the network
+protocol database shall not be closed after each call to
+\fIgetprotoent\fP() (either directly, or indirectly through one of
+the other \fIgetproto*\fP() functions), and the implementation may
+maintain an open file descriptor for
+the database.
+.LP
+The \fIgetprotobyname\fP() function shall search the database from
+the beginning and find the first entry for which the
+protocol name specified by \fIname\fP matches the \fIp_name\fP member,
+opening and closing a connection to the database as
+necessary.
+.LP
+The \fIgetprotobynumber\fP() function shall search the database from
+the beginning and find the first entry for which the
+protocol number specified by \fIproto\fP matches the \fIp_proto\fP
+member, opening and closing a connection to the database as
+necessary.
+.LP
+The \fIgetprotoent\fP() function shall read the next entry of the
+database, opening and closing a connection to the database as
+necessary.
+.LP
+The \fIgetprotobyname\fP(), \fIgetprotobynumber\fP(), and \fIgetprotoent\fP()
+functions shall each return a pointer to a
+\fBprotoent\fP structure, the members of which shall contain the fields
+of an entry in the network protocol database.
+.LP
+The \fIendprotoent\fP() function shall close the connection to the
+database, releasing any open file descriptor.
+.LP
+These functions need not be reentrant. A function that is not required
+to be reentrant is not required to be thread-safe.
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIgetprotobyname\fP(), \fIgetprotobynumber\fP(),
+and \fIgetprotoent\fP() return a pointer to a
+\fBprotoent\fP 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.
+.SH ERRORS
+.LP
+No errors are defined.
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The \fIgetprotobyname\fP(), \fIgetprotobynumber\fP(), and \fIgetprotoent\fP()
+functions may return pointers to static data,
+which may be overwritten by subsequent calls to any of these functions.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+The Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<netdb.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- 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 .