minix/lib/libc/net/getprotoent.3
Lionel Sambuc f14fb60209 Libraries updates and cleanup
* Updating common/lib
 * Updating lib/csu
 * Updating lib/libc
 * Updating libexec/ld.elf_so
 * Corrected test on __minix in featuretest to actually follow the
   meaning of the comment.
 * Cleaned up _REENTRANT-related defintions.
 * Disabled -D_REENTRANT for libfetch
 * Removing some unneeded __NBSD_LIBC defines and tests

Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
2013-01-14 11:36:26 +01:00

156 lines
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.\" $NetBSD: getprotoent.3,v 1.13 2011/07/14 22:12:30 wiz Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\" @(#)getprotoent.3 8.1 (Berkeley) 6/4/93
.\"
.Dd July 15, 2011
.Dt GETPROTOENT 3
.Os
.Sh NAME
.Nm getprotoent ,
.Nm getprotobynumber ,
.Nm getprotobyname ,
.Nm setprotoent ,
.Nm endprotoent
.Nd get protocol entry
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In netdb.h
.Ft struct protoent *
.Fn getprotoent
.Ft struct protoent *
.Fn getprotobyname "const char *name"
.Ft struct protoent *
.Fn getprotobynumber "int proto"
.Ft void
.Fn setprotoent "int stayopen"
.Ft void
.Fn endprotoent "void"
.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 data base,
.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 -offset indent
.It Fa p_name
The official name of the protocol.
.It Fa p_aliases
A zero terminated list of alternative 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 net data base 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
function
and
.Fn getprotobynumber
sequentially search from the beginning
of the file until a matching
protocol name or
protocol number is found,
or until
.Dv EOF
is encountered.
.Sh RETURN VALUES
Upon success,
.Fn getprotoent ,
.Fn getprotobyname ,
and
.Fn getprotobynumber
return a pointer to the
.Vt protoent
structure as described above.
A
.Dv NULL
pointer is returned on
.Dv EOF
or error.
.Sh FILES
.Bl -tag -width /etc/protocols -compact
.It Pa /etc/protocols
.El
.Sh SEE ALSO
.Xr protocols 5
.Sh HISTORY
The
.Fn getprotoent ,
.Fn getprotobynumber ,
.Fn getprotobyname ,
.Fn setprotoent ,
and
.Fn endprotoent
functions appeared in
.Bx 4.2 .
.Sh BUGS
These 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.