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-.\"     $OpenBSD: getprotoent.3,v 1.18 2013/06/05 03:39:23 tedu Exp $
-.\"
-.\" Copyright (c) 1983, 1991, 1993
-.\"     The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.Dd $Mdocdate: June 5 2013 $
-.Dt GETPROTOENT 3
-.Os
-.Sh NAME
-.Nm getprotoent ,
-.Nm getprotoent_r ,
-.Nm getprotobynumber ,
-.Nm getprotobynumber_r ,
-.Nm getprotobyname ,
-.Nm getprotobyname_r ,
-.Nm setprotoent ,
-.Nm setprotoent_r ,
-.Nm endprotoent ,
-.Nm endprotoent_r
-.Nd get protocol entry
-.Sh SYNOPSIS
-.In netdb.h
-.Ft struct protoent *
-.Fn getprotoent "void"
-.Ft int
-.Fn getprotoent_r "struct protoent *protoent" "struct protoent_data *protoent_data"
-.Ft struct protoent *
-.Fn getprotobyname "const char *name"
-.Ft int
-.Fn getprotobyname_r "const char *name" "struct protoent *protoent" "struct protoent_data *protoent_data"
-.Ft struct protoent *
-.Fn getprotobynumber "int proto"
-.Ft int
-.Fn getprotobynumber_r "int proto" "struct protoent *protoent" "struct protoent_data *protoent_data"
-.Ft void
-.Fn setprotoent "int stayopen"
-.Ft void
-.Fn setprotoent_r "int stayopen" "struct protoent_data *protoent_data"
-.Ft void
-.Fn endprotoent "void"
-.Ft void
-.Fn endprotoent_r "struct protoent_data *protoent_data"
-.Sh DESCRIPTION
-The
-.Fn getprotoent ,
-.Fn getprotobyname ,
-and
-.Fn getprotobynumber
-functions each return a pointer to an object with the following structure
-containing the broken-out fields of a line in the network protocol database,
-.Pa /etc/protocols .
-.Bd -literal -offset indent
-.Pp
-struct  protoent {
-        char    *p_name;        /* official name of protocol */
-        char    **p_aliases;    /* alias list */
-        int     p_proto;        /* protocol number */
-};
-.Ed
-.Pp
-The members of this structure are:
-.Bl -tag -width p_aliases
-.It Fa p_name
-The official name of the protocol.
-.It Fa p_aliases
-A null-terminated list of alternate names for the protocol.
-.It Fa p_proto
-The protocol number.
-.El
-.Pp
-The
-.Fn getprotoent
-function reads the next line of the file, opening the file if necessary.
-.Pp
-The
-.Fn setprotoent
-function opens and rewinds the file.
-If the
-.Fa stayopen
-flag is non-zero,
-the protocol database will not be closed after each call to
-.Fn getprotobyname
-or
-.Fn getprotobynumber .
-.Pp
-The
-.Fn endprotoent
-function closes the file.
-.Pp
-The
-.Fn getprotobyname
-and
-.Fn getprotobynumber
-functions sequentially search from the beginning of the file until a
-matching protocol name or protocol number is found, or until
-.Dv EOF
-is encountered.
-.Pp
-The
-.Fn getprotoent_r ,
-.Fn getprotobyport_r ,
-.Fn getprotobyname_r ,
-.Fn setprotoent_r ,
-and
-.Fn endprotoent_r
-functions are reentrant versions of the above functions that take a
-pointer to a
-.Vt protoent_data
-structure which is used to store state information.
-The structure must be zero-filled before it is used
-and should be considered opaque for the sake of portability.
-.Pp
-The
-.Fn getprotoent_r ,
-.Fn getprotobyport_r ,
-and
-.Fn getprotobyname_r
-functions
-also take a pointer to a
-.Vt protoent
-structure which is used to store the results of the database lookup.
-.Sh RETURN VALUES
-The
-.Fn getprotoent ,
-.Fn getprotobyport ,
-and
-.Fn getprotobyname
-functions return a pointer to a
-.Vt protoent
-structure on success or a null pointer if end-of-file
-is reached or an error occurs.
-.Pp
-The
-.Fn getprotoent_r ,
-.Fn getprotobyport_r ,
-and
-.Fn getprotobyname_r
-functions return 0 on success or \-1 if end-of-file
-is reached or an error occurs.
-.Sh FILES
-.Bl -tag -width /etc/protocols -compact
-.It Pa /etc/protocols
-.El
-.Sh SEE ALSO
-.Xr protocols 5
-.Sh STANDARDS
-The
-.Fn getprotoent ,
-.Fn getprotobynumber ,
-.Fn getprotobyname ,
-.Fn setprotoent ,
-and
-.Fn endprotoent
-functions conform to
-.St -p1003.1-2004 .
-.Pp
-The
-.Fn getprotoent_r ,
-.Fn getprotobyport_r ,
-.Fn getprotobyname_r ,
-.Fn setprotoent_r ,
-and
-.Fn endprotoent_r
-functions are not currently standardized.
-This implementation follows the API used by HP, IBM, and Digital.
-.Sh HISTORY
-The
-.Fn getprotoent ,
-.Fn getprotobynumber ,
-.Fn getprotobyname ,
-.Fn setprotoent ,
-and
-.Fn endprotoent
-functions appeared in
-.Bx 4.2 .
-.Pp
-The
-.Fn getprotoent_r ,
-.Fn getprotobyport_r ,
-.Fn getprotobyname_r ,
-.Fn setprotoent_r ,
-and
-.Fn endprotoent_r
-functions appeared in
-.Ox 3.7 .
-.Sh BUGS
-The non-reentrant functions use a static data space; if the data is needed
-for future use, it should be copied before any subsequent calls overwrite it.
-Only the Internet protocols are currently understood.