RC_DEPTREE(3)

NAME
rc_deptree_update, rc_deptree_update_needed, rc_deptree_load, rc_deptree_depend, rc_deptree_depends, rc_deptree_order, rc_deptree_free - RC dependency tree functions

LIBRARY
Run Command library (librc, -lrc)

SYNOPSIS
#include <rc.h>
bool rc_deptree_update(void);
bool rc_deptree_update_needed(void);
RC_DEPTREE rc_deptree_load(void);
RC_STRINGLIST * rc_deptree_depend(
const RC_DEPTREE *deptree, const char *type, const char *service);
bool rc_deptree_depends(
const RC_DEPTREE *deptree, const char *const *types, const char *const *services, const char *runlevel, int options);
RC_STRINGLIST * rc_deptree_order(
const RC_DEPTREE *deptree, const char *runlevel, int options);
void rc_deptree_free(RC_DEPTREE *deptree);

DESCRIPTION
These functions provide a means of querying the dependencies of OpenRC services.

rc_deptree_update() updates the service dependency tree, normally /run/openrc/deptree. rc_deptree_update_needed() checks to see if the dependency tree needs updated based on the mtime of it compared to /etc/init.d, /etc/conf.d, /usr/local/etc/init.d, /usr/local/etc/conf.d, /etc/rc.conf and any files specified by a service.

rc_deptree_load() loads the deptree and returns a pointer to it which needs to be freed by rc_deptree_free() when done.

rc_deptree_depend(), rc_deptree_depends() and rc_deptree_order() return a list of services from the deptree based on the type or types of dependency. options can be a bitmask of RC_DEP_TRACE and RC_DEP_STRICT. RC_DEP_TRACE follows each services dependencies right down to the first service needed and RC_DEP_STRICT only lists services actually needed or in the runlevel.

IMPLEMENTATION NOTES
Each function that returns RC_STRINGLIST * should be freed by calling rc_stringlist_free() when done.

SEE ALSO
malloc(3), free(3), rc_stringlist_free(3), openrc-run(8)

AUTHORS
Roy Marples <roy@marples.name>