155 lines
2.9 KiB
Groff
155 lines
2.9 KiB
Groff
.\" @(#)getnetpath.3n 1.26 93/05/07 SMI; from SVr4
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.\" $NetBSD: getnetpath.3,v 1.1 2000/06/02 23:11:11 fvdl Exp $
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.\" $FreeBSD$
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.\" Copyright 1989 AT&T
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.Dd April 22, 2000
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.Dt GETNETPATH 3
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.Os
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.Sh NAME
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.Nm getnetpath ,
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.Nm setnetpath ,
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.Nm endnetpath
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.Nd get
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.Pa /etc/netconfig
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entry corresponding to
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.Ev NETPATH
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component
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <netconfig.h>
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.Ft "struct netconfig *"
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.Fn getnetpath "void *handlep"
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.Ft "void *"
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.Fn setnetpath "void"
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.Ft int
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.Fn endnetpath "void *handlep"
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.Sh DESCRIPTION
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The routines described in this page provide the application access to the system
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network configuration database,
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.Pa /etc/netconfig ,
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as it is
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.Dq filtered
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by the
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.Ev NETPATH
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environment variable (see
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.Xr environ 7 ) .
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See
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.Xr getnetconfig 3
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for other routines that also access the
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network configuration database directly.
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The
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.Ev NETPATH
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variable is a list of colon-separated network identifiers.
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.Pp
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.Fn getnetpath
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returns a pointer to the
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netconfig database entry corresponding to the first valid
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.Ev NETPATH
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component.
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The netconfig entry is formatted as a
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.Ft "struct netconfig" .
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On each subsequent call,
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.Fn getnetpath
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returns a pointer to the netconfig entry that corresponds to the next
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valid
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.Ev NETPATH
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component.
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.Fn getnetpath
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can thus be used to search the netconfig database for all networks
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included in the
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.Ev NETPATH
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variable.
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When
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.Ev NETPATH
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has been exhausted,
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.Fn getnetpath
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returns
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.Dv NULL .
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.Pp
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A call to
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.Fn setnetpath
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.Dq binds
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to or
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.Dq rewinds
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.Ev NETPATH .
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.Fn setnetpath
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must be called before the first call to
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.Fn getnetpath
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and may be called at any other time.
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It returns a handle that is used by
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.Fn getnetpath .
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.Pp
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.Fn getnetpath
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silently ignores invalid
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.Ev NETPATH
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components.
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A
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.Ev NETPATH
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component is invalid if there is no corresponding
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entry in the netconfig database.
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.Pp
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If the
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.Ev NETPATH
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variable is unset,
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.Fn getnetpath
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behaves as if
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.Ev NETPATH
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were set to the sequence of
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.Dq default
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or
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.Dq visible
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networks in the netconfig database, in the
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order in which they are listed.
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.\"This proviso holds also for this
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.\"whole manpage.
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.Pp
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.Fn endnetpath
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may be called to
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.Dq unbind
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from
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.Ev NETPATH
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when processing is complete, releasing resources for reuse.
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Programmers should be aware, however, that
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.Fn endnetpath
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frees all memory allocated by
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.Fn getnetpath
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for the struct netconfig data structure.
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.Sh RETURN VALUES
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.Fn setnetpath
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returns a handle that is used by
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.Fn getnetpath .
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In case of an error,
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.Fn setnetpath
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returns
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.Dv NULL .
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.Pp
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.Fn endnetpath
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returns 0 on success and \-1 on failure
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(for example, if
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.Fn setnetpath
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was not called previously).
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.Fn nc_perror
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or
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.Fn nc_sperror
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can be used to print out the reason for failure.
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See
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.Xr getnetconfig 3 .
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.Pp
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When first called,
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.Fn getnetpath
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returns a pointer to the netconfig database entry corresponding to the first
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valid
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.Ev NETPATH
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component.
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When
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.Ev NETPATH
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has been exhausted,
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.Fn getnetpath
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returns
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.Dv NULL .
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.Sh SEE ALSO
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.Xr getnetconfig 3 ,
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.Xr netconfig 5 ,
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.Xr environ 7
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