344 lines
11 KiB
C
344 lines
11 KiB
C
#include "syslib.h"
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#include <assert.h>
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#include <minix/sysutil.h>
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/* SEF Live update variables. */
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static int sef_lu_state;
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/* SEF Live update callbacks. */
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static struct sef_cbs {
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sef_cb_lu_prepare_t sef_cb_lu_prepare;
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sef_cb_lu_state_isvalid_t sef_cb_lu_state_isvalid;
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sef_cb_lu_state_changed_t sef_cb_lu_state_changed;
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sef_cb_lu_state_dump_t sef_cb_lu_state_dump;
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sef_cb_lu_state_save_t sef_cb_lu_state_save;
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sef_cb_lu_response_t sef_cb_lu_response;
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} sef_cbs = {
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SEF_CB_LU_PREPARE_DEFAULT,
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SEF_CB_LU_STATE_ISVALID_DEFAULT,
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SEF_CB_LU_STATE_CHANGED_DEFAULT,
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SEF_CB_LU_STATE_DUMP_DEFAULT,
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SEF_CB_LU_STATE_SAVE_DEFAULT,
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SEF_CB_LU_RESPONSE_DEFAULT
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};
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/* SEF Live update prototypes for sef_receive(). */
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void do_sef_lu_before_receive(void);
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int do_sef_lu_request(message *m_ptr);
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/* SEF Live update helpers. */
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static void sef_lu_ready(int result);
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/* Debug. */
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EXTERN char* sef_debug_header(void);
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static int sef_lu_debug_cycle = 0;
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/* Information about SELF. */
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EXTERN endpoint_t sef_self_endpoint;
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EXTERN int sef_self_first_receive_done;
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/*===========================================================================*
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* do_sef_lu_before_receive *
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*===========================================================================*/
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void do_sef_lu_before_receive()
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{
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/* Handle SEF Live update before receive events. */
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int r;
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/* Initialize on first receive. */
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if(!sef_self_first_receive_done) {
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sef_lu_state = SEF_LU_STATE_NULL;
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}
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/* Nothing to do if we are not preparing for a live update. */
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if(sef_lu_state == SEF_LU_STATE_NULL) {
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return;
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}
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/* Debug. */
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#if SEF_LU_DEBUG
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sef_lu_debug_cycle++;
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sef_lu_debug_begin();
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sef_lu_dprint("%s, cycle=%d. Dumping state variables:\n",
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sef_debug_header(), sef_lu_debug_cycle);
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sef_cbs.sef_cb_lu_state_dump(sef_lu_state);
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sef_lu_debug_end();
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#endif
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/* Let the callback code handle the event.
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* For SEF_LU_STATE_WORK_FREE, we're always ready, tell immediately.
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*/
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r = OK;
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if(sef_lu_state != SEF_LU_STATE_WORK_FREE) {
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r = sef_cbs.sef_cb_lu_prepare(sef_lu_state);
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}
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if(r == OK) {
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sef_lu_ready(OK);
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}
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}
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/*===========================================================================*
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* do_sef_lu_request *
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*===========================================================================*/
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int do_sef_lu_request(message *m_ptr)
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{
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/* Handle a SEF Live update request. */
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int state, old_state, is_valid_state;
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sef_lu_debug_cycle = 0;
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old_state = sef_lu_state;
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state = m_ptr->RS_LU_STATE;
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/* Deal with prepare cancel requests first. */
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is_valid_state = (state == SEF_LU_STATE_NULL);
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/* Otherwise only accept live update requests with a valid state. */
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is_valid_state = is_valid_state || sef_cbs.sef_cb_lu_state_isvalid(state);
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if(!is_valid_state) {
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if(sef_cbs.sef_cb_lu_state_isvalid == SEF_CB_LU_STATE_ISVALID_NULL) {
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sef_lu_ready(ENOSYS);
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}
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else {
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sef_lu_ready(EINVAL);
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}
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}
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else {
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/* Set the new live update state. */
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sef_lu_state = state;
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/* If the live update state changed, let the callback code
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* handle the rest.
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*/
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if(old_state != sef_lu_state) {
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sef_cbs.sef_cb_lu_state_changed(old_state, sef_lu_state);
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}
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}
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/* Return OK not to let anybody else intercept the request. */
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return(OK);
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}
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/*===========================================================================*
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* sef_lu_ready *
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*===========================================================================*/
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static void sef_lu_ready(int result)
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{
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message m;
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int old_state, r;
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#if SEF_LU_DEBUG
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sef_lu_debug_begin();
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sef_lu_dprint("%s, cycle=%d. Ready to update with result: %d%s\n",
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sef_debug_header(), sef_lu_debug_cycle,
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result, (result == OK ? "(OK)" : ""));
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sef_lu_debug_end();
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#endif
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/* If result is OK, let the callback code save
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* any state that must be carried over to the new version.
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*/
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if(result == OK) {
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r = sef_cbs.sef_cb_lu_state_save(sef_lu_state);
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if(r != OK) {
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/* Abort update if callback returned error. */
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result = r;
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}
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}
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/* Let the callback code produce a live update response and block.
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* We should get beyond this point only if either result is an error or
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* something else goes wrong in the callback code.
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*/
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m.m_source = sef_self_endpoint;
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m.m_type = RS_LU_PREPARE;
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m.RS_LU_STATE = sef_lu_state;
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m.RS_LU_RESULT = result;
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r = sef_cbs.sef_cb_lu_response(&m);
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#if SEF_LU_DEBUG
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sef_lu_debug_begin();
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sef_lu_dprint("%s, cycle=%d. The %s aborted the update with result %d!\n",
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sef_debug_header(), sef_lu_debug_cycle,
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(result == OK ? "server" : "client"),
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(result == OK ? r : result)); /* EINTR if update was canceled. */
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sef_lu_debug_end();
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#endif
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/* Something went wrong. Update was aborted and we didn't get updated.
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* Restore things back to normal and continue executing.
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*/
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old_state = sef_lu_state;
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sef_lu_state = SEF_LU_STATE_NULL;
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if(old_state != sef_lu_state) {
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sef_cbs.sef_cb_lu_state_changed(old_state, sef_lu_state);
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}
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}
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/*===========================================================================*
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* sef_setcb_lu_prepare *
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*===========================================================================*/
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void sef_setcb_lu_prepare(sef_cb_lu_prepare_t cb)
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{
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assert(cb != NULL);
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sef_cbs.sef_cb_lu_prepare = cb;
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}
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/*===========================================================================*
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* sef_setcb_lu_state_isvalid *
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*===========================================================================*/
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void sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_t cb)
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{
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assert(cb != NULL);
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sef_cbs.sef_cb_lu_state_isvalid = cb;
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}
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/*===========================================================================*
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* sef_setcb_lu_state_changed *
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*===========================================================================*/
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void sef_setcb_lu_state_changed(sef_cb_lu_state_changed_t cb)
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{
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assert(cb != NULL);
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sef_cbs.sef_cb_lu_state_changed = cb;
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}
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/*===========================================================================*
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* sef_setcb_lu_state_dump *
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*===========================================================================*/
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void sef_setcb_lu_state_dump(sef_cb_lu_state_dump_t cb)
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{
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assert(cb != NULL);
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sef_cbs.sef_cb_lu_state_dump = cb;
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}
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/*===========================================================================*
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* sef_setcb_lu_state_save *
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*===========================================================================*/
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void sef_setcb_lu_state_save(sef_cb_lu_state_save_t cb)
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{
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assert(cb != NULL);
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sef_cbs.sef_cb_lu_state_save = cb;
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}
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/*===========================================================================*
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* sef_setcb_lu_response *
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*===========================================================================*/
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void sef_setcb_lu_response(sef_cb_lu_response_t cb)
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{
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assert(cb != NULL);
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sef_cbs.sef_cb_lu_response = cb;
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}
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/*===========================================================================*
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* sef_cb_lu_prepare_null *
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*===========================================================================*/
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int sef_cb_lu_prepare_null(int UNUSED(state))
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{
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return ENOTREADY;
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}
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/*===========================================================================*
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* sef_cb_lu_state_isvalid_null *
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*===========================================================================*/
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int sef_cb_lu_state_isvalid_null(int UNUSED(state))
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{
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return FALSE;
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}
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/*===========================================================================*
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* sef_cb_lu_state_changed_null *
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*===========================================================================*/
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void sef_cb_lu_state_changed_null(int UNUSED(old_state),
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int UNUSED(state))
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{
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}
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/*===========================================================================*
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* sef_cb_lu_state_dump_null *
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*===========================================================================*/
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void sef_cb_lu_state_dump_null(int UNUSED(state))
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{
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sef_lu_dprint("NULL\n");
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}
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/*===========================================================================*
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* sef_cb_lu_state_save_null *
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*===========================================================================*/
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int sef_cb_lu_state_save_null(int UNUSED(result))
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{
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return OK;
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}
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/*===========================================================================*
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* sef_cb_lu_response_null *
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*===========================================================================*/
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int sef_cb_lu_response_null(message * UNUSED(m_ptr))
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{
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return ENOSYS;
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}
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/*===========================================================================*
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* sef_cb_lu_prepare_always_ready *
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*===========================================================================*/
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int sef_cb_lu_prepare_always_ready(int UNUSED(state))
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{
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return OK;
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}
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/*===========================================================================*
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* sef_cb_lu_prepare_never_ready *
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*===========================================================================*/
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int sef_cb_lu_prepare_never_ready(int UNUSED(state))
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{
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#if SEF_LU_DEBUG
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sef_lu_debug_begin();
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sef_lu_dprint("%s, cycle=%d. Simulating a service never ready to update...\n",
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sef_debug_header(), sef_lu_debug_cycle);
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sef_lu_debug_end();
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#endif
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return ENOTREADY;
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}
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/*===========================================================================*
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* sef_cb_lu_prepare_crash *
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*===========================================================================*/
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int sef_cb_lu_prepare_crash(int UNUSED(state))
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{
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panic("Simulating a crash at update prepare time...");
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return OK;
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}
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/*===========================================================================*
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* sef_cb_lu_state_isvalid_standard *
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*===========================================================================*/
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int sef_cb_lu_state_isvalid_standard(int state)
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{
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return SEF_LU_STATE_IS_STANDARD(state);
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}
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/*===========================================================================*
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* sef_cb_lu_state_isvalid_workfree *
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*===========================================================================*/
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int sef_cb_lu_state_isvalid_workfree(int state)
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{
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return (state == SEF_LU_STATE_WORK_FREE);
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}
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/*===========================================================================*
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* sef_cb_lu_response_rs_reply *
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*===========================================================================*/
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int sef_cb_lu_response_rs_reply(message *m_ptr)
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{
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int r;
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/* Inform RS that we're ready with the given result. */
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r = sendrec(RS_PROC_NR, m_ptr);
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if ( r != OK) {
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return r;
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}
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return m_ptr->m_type == RS_LU_PREPARE ? EINTR : m_ptr->m_type;
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}
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