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/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2015 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Ard Biesheuvel <a.k.biesheuvel@its.tudelft.nl> |
+----------------------------------------------------------------------+
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#if HAVE_IBASE
#include "php_interbase.h"
#include "php_ibase_includes.h"
static int le_event;
static void _php_ibase_event_free(char *event_buf, char *result_buf) /* {{{ */
{
isc_free(event_buf);
isc_free(result_buf);
}
/* }}} */
void _php_ibase_free_event(ibase_event *event) /* {{{ */
{
unsigned short i;
event->state = DEAD;
if (event->link != NULL) {
ibase_event **node;
if (event->link->handle != NULL &&
isc_cancel_events(IB_STATUS, &event->link->handle, &event->event_id)) {
_php_ibase_error();
}
/* delete this event from the link struct */
for (node = &event->link->event_head; *node != event; node = &(*node)->event_next);
*node = event->event_next;
}
if (Z_TYPE(event->callback) != IS_UNDEF) {
zval_dtor(&event->callback);
ZVAL_UNDEF(&event->callback);
_php_ibase_event_free(event->event_buffer,event->result_buffer);
for (i = 0; i < event->event_count; ++i) {
efree(event->events[i]);
}
efree(event->events);
}
}
/* }}} */
static void _php_ibase_free_event_rsrc(zend_resource *rsrc) /* {{{ */
{
ibase_event *e = (ibase_event *) rsrc->ptr;
_php_ibase_free_event(e);
efree(e);
}
/* }}} */
void php_ibase_events_minit(INIT_FUNC_ARGS) /* {{{ */
{
le_event = zend_register_list_destructors_ex(_php_ibase_free_event_rsrc, NULL,
"interbase event", module_number);
}
/* }}} */
static void _php_ibase_event_block(ibase_db_link *ib_link, unsigned short count, /* {{{ */
char **events, unsigned short *l, char **event_buf, char **result_buf)
{
ISC_STATUS dummy_result[20];
unsigned long dummy_count[15];
/**
* Unfortunately, there's no clean and portable way in C to pass arguments to
* a variadic function if you don't know the number of arguments at compile time.
* (And even if there were a way, the Interbase API doesn't provide a version of
* this function that takes a va_list as an argument)
*
* In this case, the number of arguments is limited to 18 by the underlying API,
* so we can work around it.
*/
*l = (unsigned short) isc_event_block(event_buf, result_buf, count, events[0],
events[1], events[2], events[3], events[4], events[5], events[6], events[7],
events[8], events[9], events[10], events[11], events[12], events[13], events[14]);
/**
* Currently, this is the only way to correctly initialize an event buffer.
* This is clearly something that should be fixed, cause the semantics of
* isc_wait_for_event() indicate that it blocks until an event occurs.
* If the Firebird people ever fix this, these lines should be removed,
* otherwise, events will have to fire twice before ibase_wait_event() returns.
*/
isc_wait_for_event(dummy_result, &ib_link->handle, *l, *event_buf, *result_buf);
isc_event_counts(dummy_count, *l, *event_buf, *result_buf);
}
/* }}} */
/* {{{ proto string ibase_wait_event([resource link_identifier,] string event [, string event [, ...]])
Waits for any one of the passed Interbase events to be posted by the database, and returns its name */
PHP_FUNCTION(ibase_wait_event)
{
zval *args;
ibase_db_link *ib_link;
int num_args;
char *event_buffer, *result_buffer, *events[15];
unsigned short i = 0, event_count = 0, buffer_size;
unsigned long occurred_event[15];
RESET_ERRMSG;
/* no more than 15 events */
if (ZEND_NUM_ARGS() < 1 || ZEND_NUM_ARGS() > 16) {
WRONG_PARAM_COUNT;
}
if (zend_parse_parameters(ZEND_NUM_ARGS(), "+", &args, &num_args) == FAILURE) {
return;
}
if (Z_TYPE(args[0]) == IS_RESOURCE) {
if ((ib_link = (ibase_db_link *)zend_fetch_resource2_ex(&args[0], "InterBase link", le_link, le_plink)) == NULL) {
efree(args);
RETURN_FALSE;
}
i = 1;
} else {
if (ZEND_NUM_ARGS() > 15) {
efree(args);
WRONG_PARAM_COUNT;
}
if ((ib_link = (ibase_db_link *)zend_fetch_resource2_ex(IBG(default_link), "InterBase link", le_link, le_plink)) == NULL) {
efree(args);
RETURN_FALSE;
}
}
for (; i < ZEND_NUM_ARGS(); ++i) {
convert_to_string_ex(&args[i]);
events[event_count++] = Z_STRVAL(args[i]);
}
/* fills the required data structure with information about the events */
_php_ibase_event_block(ib_link, event_count, events, &buffer_size, &event_buffer, &result_buffer);
/* now block until an event occurs */
if (isc_wait_for_event(IB_STATUS, &ib_link->handle, buffer_size, event_buffer, result_buffer)) {
_php_ibase_error();
_php_ibase_event_free(event_buffer,result_buffer);
efree(args);
RETURN_FALSE;
}
/* find out which event occurred */
isc_event_counts(occurred_event, buffer_size, event_buffer, result_buffer);
for (i = 0; i < event_count; ++i) {
if (occurred_event[i]) {
zend_string *result = zend_string_init(events[i], strlen(events[i]), 0);
_php_ibase_event_free(event_buffer,result_buffer);
efree(args);
RETURN_STR(result);
}
}
/* If we reach this line, isc_wait_for_event() did return, but we don't know
which event fired. */
_php_ibase_event_free(event_buffer,result_buffer);
efree(args);
RETURN_FALSE;
}
/* }}} */
static isc_callback _php_ibase_callback(ibase_event *event, /* {{{ */
unsigned short buffer_size, char *result_buf)
{
zval *res;
/* this function is called asynchronously by the Interbase client library. */
TSRMLS_FETCH_FROM_CTX(event->thread_ctx);
/**
* The callback function is called when the event is first registered and when the event
* is cancelled. I consider this is a bug. By clearing event->callback first and setting
* it to -1 later, we make sure nothing happens if no event was actually posted.
*/
switch (event->state) {
unsigned short i;
unsigned long occurred_event[15];
zval return_value, args[2];
default: /* == DEAD */
break;
case ACTIVE:
/* copy the updated results into the result buffer */
memcpy(event->result_buffer, result_buf, buffer_size);
res = zend_hash_index_find(&EG(regular_list), event->link_res_id);
ZVAL_RES(&args[1], Z_RES_P(res));
/* find out which event occurred */
isc_event_counts(occurred_event, buffer_size, event->event_buffer, event->result_buffer);
for (i = 0; i < event->event_count; ++i) {
if (occurred_event[i]) {
ZVAL_STRING(&args[0], event->events[i]);
efree(event->events[i]);
break;
}
}
/* call the callback provided by the user */
if (SUCCESS != call_user_function(EG(function_table), NULL,
&event->callback, &return_value, 2, args)) {
_php_ibase_module_error("Error calling callback %s", Z_STRVAL(event->callback));
break;
}
if (Z_TYPE(return_value) == IS_FALSE) {
event->state = DEAD;
break;
}
case NEW:
/* re-register the event */
if (isc_que_events(IB_STATUS, &event->link->handle, &event->event_id, buffer_size,
event->event_buffer,(isc_callback)_php_ibase_callback, (void *)event)) {
_php_ibase_error();
}
event->state = ACTIVE;
}
return 0;
}
/* }}} */
/* {{{ proto resource ibase_set_event_handler([resource link_identifier,] callback handler, string event [, string event [, ...]])
Register the callback for handling each of the named events */
PHP_FUNCTION(ibase_set_event_handler)
{
/**
* The callback passed to this function should take an event name (string) and a
* link resource id (int) as arguments. The value returned from the function is
* used to determine if the event handler should remain set.
*/
zend_string *cb_name;
zval *args, *cb_arg;
ibase_db_link *ib_link;
ibase_event *event;
unsigned short i = 1, buffer_size;
int link_res_id, num_args;
RESET_ERRMSG;
/* Minimum and maximum number of arguments allowed */
if (ZEND_NUM_ARGS() < 2 || ZEND_NUM_ARGS() > 17) {
WRONG_PARAM_COUNT;
}
if (zend_parse_parameters(ZEND_NUM_ARGS(), "+", &args, &num_args) == FAILURE) {
return;
}
/* get a working link */
if (Z_TYPE(args[0]) != IS_STRING) {
/* resource, callback, event_1 [, ... event_15]
* No more than 15 events
*/
if (ZEND_NUM_ARGS() < 3 || ZEND_NUM_ARGS() > 17) {
WRONG_PARAM_COUNT;
}
cb_arg = &args[1];
i = 2;
if ((ib_link = (ibase_db_link *)zend_fetch_resource2_ex(&args[0], "InterBase link", le_link, le_plink)) == NULL) {
RETURN_FALSE;
}
convert_to_long_ex(&args[0]);
link_res_id = Z_LVAL(args[0]);
} else {
/* callback, event_1 [, ... event_15]
* No more than 15 events
*/
if (ZEND_NUM_ARGS() < 2 || ZEND_NUM_ARGS() > 16) {
WRONG_PARAM_COUNT;
}
cb_arg = &args[0];
if ((ib_link = (ibase_db_link *)zend_fetch_resource2_ex(IBG(default_link), "InterBase link", le_link, le_plink)) == NULL) {
RETURN_FALSE;
}
link_res_id = IBG(default_link);
}
/* get the callback */
if (!zend_is_callable(cb_arg, 0, &cb_name)) {
_php_ibase_module_error("Callback argument %s is not a callable function", cb_name->val);
zend_string_release(cb_name);
RETURN_FALSE;
}
zend_string_release(cb_name);
/* allocate the event resource */
event = (ibase_event *) safe_emalloc(sizeof(ibase_event), 1, 0);
TSRMLS_SET_CTX(event->thread_ctx);
event->link_res_id = link_res_id;
event->link = ib_link;
event->event_count = 0;
event->state = NEW;
event->events = (char **) safe_emalloc(sizeof(char *),ZEND_NUM_ARGS()-i,0);
ZVAL_DUP(&event->callback, cb_arg);
for (; i < ZEND_NUM_ARGS(); ++i) {
convert_to_string_ex(&args[i]);
event->events[event->event_count++] = estrdup(Z_STRVAL(args[i]));
}
/* fills the required data structure with information about the events */
_php_ibase_event_block(ib_link, event->event_count, event->events,
&buffer_size, &event->event_buffer, &event->result_buffer);
/* now register the events with the Interbase API */
if (isc_que_events(IB_STATUS, &ib_link->handle, &event->event_id, buffer_size,
event->event_buffer,(isc_callback)_php_ibase_callback, (void *)event)) {
_php_ibase_error();
efree(event);
RETURN_FALSE;
}
event->event_next = ib_link->event_head;
ib_link->event_head = event;
RETVAL_RES(zend_register_resource(event, le_event));
Z_TRY_ADDREF_P(return_value);
}
/* }}} */
/* {{{ proto bool ibase_free_event_handler(resource event)
Frees the event handler set by ibase_set_event_handler() */
PHP_FUNCTION(ibase_free_event_handler)
{
zval *event_arg;
RESET_ERRMSG;
if (SUCCESS == zend_parse_parameters(ZEND_NUM_ARGS(), "r", &event_arg)) {
ibase_event *event;
event = (ibase_event *)zend_fetch_resource_ex(event_arg, "Interbase event", le_event);
event->state = DEAD;
zend_list_delete(Z_RES_P(event_arg));
RETURN_TRUE;
} else {
RETURN_FALSE;
}
}
/* }}} */
#endif /* HAVE_IBASE */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
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