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.\" Copyright (c) 2007-2015 The OpenRC Authors.
.\" See the Authors file at the top-level directory of this distribution and
.\" https://github.com/OpenRC/openrc/blob/master/AUTHORS
.\"
.\" This file is part of OpenRC. It is subject to the license terms in
.\" the LICENSE file found in the top-level directory of this
.\" distribution and at https://github.com/OpenRC/openrc/blob/master/LICENSE
.\" This file may not be copied, modified, propagated, or distributed
.\" except according to the terms contained in the LICENSE file.
.\"
.Dd Mar 16, 2008
.Dt RC_DEPTREE 3 SMM
.Os OpenRC
.Sh NAME
.Nm rc_deptree_update , rc_deptree_update_needed , rc_deptree_load ,
.Nm rc_deptree_depend , rc_deptree_depends , rc_deptree_order ,
.Nm rc_deptree_free
.Nd RC dependency tree functions
.Sh LIBRARY
Run Command library (librc, -lrc)
.Sh SYNOPSIS
.In rc.h
.Ft bool Fn rc_deptree_update void
.Ft bool Fn rc_deptree_update_needed void
.Ft RC_DEPTREE Fn rc_deptree_load void
.Ft "RC_STRINGLIST *" Fo rc_deptree_depend
.Fa "const RC_DEPTREE *deptree"
.Fa "const char *type"
.Fa "const char *service"
.Fc
.Ft bool Fo rc_deptree_depends
.Fa "const RC_DEPTREE *deptree"
.Fa "const char *const *types"
.Fa "const char *const *services"
.Fa "const char *runlevel"
.Fa "int options"
.Fc
.Ft "RC_STRINGLIST *" Fo rc_deptree_order
.Fa "const RC_DEPTREE *deptree"
.Fa "const char *runlevel"
.Fa "int options"
.Fc
.Ft void Fn rc_deptree_free "RC_DEPTREE *deptree"
.Sh DESCRIPTION
These functions provide a means of querying the dependencies of OpenRC
services.
.Pp
.Fn rc_deptree_update
updates the service dependency tree, normally
.Pa /lib/rc/init.d/deptree .
.Fn rc_deptree_update_needed
checks to see if the dependency tree needs updated based on the mtime of it
compared to
.Pa /etc/init.d ,
.Pa /etc/conf.d ,
.Pa /usr/local/etc/init.d ,
.Pa /usr/local/etc/conf.d ,
.Pa /etc/rc.conf
and any files specified by a service.
.Pp
.Fn rc_deptree_load
loads the deptree and returns a pointer to it which needs to be freed by
.Fn rc_deptree_free
when done.
.Pp
.Fn rc_deptree_depend ,
.Fn rc_deptree_depends
and
.Fn rc_deptree_order
return a list of services from the
.Fa deptree
based on the
.Fa type
or
.Fa types
of dependency.
.Fa options
can be a bitmask of
.Va RC_DEP_TRACE
and
.Va RC_DEP_STRICT .
.Va RC_DEP_TRACE
follows each services dependencies right down to the first service needed and
.Va RC_DEP_STRICT
only lists services actually needed or in the
.Va runlevel .
.Sh IMPLEMENTATION NOTES
Each function that returns
.Fr "RC_STRINGLIST *"
should be freed by calling
.Fn rc_stringlist_free
when done.
.Sh SEE ALSO
.Xr malloc 3 ,
.Xr free 3 ,
.Xr rc_stringlist_free 3 ,
.Xr openrc-run 8
.Sh AUTHORS
.An Roy Marples <roy@marples.name>
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