7e6cabd06e
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
145 lines
3.8 KiB
Groff
145 lines
3.8 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. 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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.In 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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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.
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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 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 thread-specific 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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