150 lines
4.0 KiB
Groff
150 lines
4.0 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getprotoent.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd June 4, 1993
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.Dt GETPROTOENT 3
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.Os
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.Sh NAME
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.Nm getprotoent ,
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.Nm getprotobynumber ,
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.Nm getprotobyname ,
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.Nm setprotoent ,
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.Nm endprotoent
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.Nd get protocol entry
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <netdb.h>
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.Ft struct protoent *
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.Fn getprotoent void
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.Ft struct protoent *
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.Fn getprotobyname "const char *name"
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.Ft struct protoent *
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.Fn getprotobynumber "int proto"
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.Ft void
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.Fn setprotoent "int stayopen"
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.Ft void
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.Fn endprotoent void
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.Sh DESCRIPTION
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The
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.Fn getprotoent ,
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.Fn getprotobyname ,
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and
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.Fn getprotobynumber
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functions
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each return a pointer to an object with the
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following structure
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containing the broken-out
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fields of a line in the network protocol data base,
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.Pa /etc/protocols .
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.Bd -literal -offset indent
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.Pp
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struct protoent {
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char *p_name; /* official name of protocol */
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char **p_aliases; /* alias list */
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int p_proto; /* protocol number */
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};
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.Ed
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.Pp
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The members of this structure are:
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.Bl -tag -width p_aliases
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.It Fa p_name
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The official name of the protocol.
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.It Fa p_aliases
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A zero terminated list of alternate names for the protocol.
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.It Fa p_proto
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The protocol number.
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.El
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.Pp
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The
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.Fn getprotoent
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function
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reads the next line of the file, opening the file if necessary.
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.Pp
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The
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.Fn setprotoent
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function
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opens and rewinds the file. If the
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.Fa stayopen
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flag is non-zero,
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the net data base will not be closed after each call to
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.Fn getprotobyname
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or
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.Fn getprotobynumber .
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.Pp
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The
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.Fn endprotoent
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function
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closes the file.
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.Pp
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The
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.Fn getprotobyname
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function
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and
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.Fn getprotobynumber
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sequentially search from the beginning
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of the file until a matching
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protocol name or
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protocol number is found,
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or until
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.Dv EOF
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is encountered.
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.Sh RETURN VALUES
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Null pointer
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(0) returned on
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.Dv EOF
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or error.
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.Sh FILES
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.Bl -tag -width /etc/protocols -compact
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.It Pa /etc/protocols
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.El
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.Sh SEE ALSO
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.Xr protocols 5
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.Sh HISTORY
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The
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.Fn getprotoent ,
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.Fn getprotobynumber ,
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.Fn getprotobyname ,
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.Fn setprotoent ,
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and
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.Fn endprotoent
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functions appeared in
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.Bx 4.2 .
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.Sh BUGS
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These functions use a static data space;
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if the data is needed for future use, it should be
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copied before any subsequent calls overwrite it.
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Only the Internet
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protocols are currently understood.
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