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LibretroAdmin
2806bb5a18
led_driver_free() leaves no driver behind, so nothing can reach a freed one before the next led_driver_init(). The init log names the driver actually chosen, by its ident, and stays quiet for the null driver, an unknown name included. A compile-time check keeps MAX_LEDS within the output store's slots. samples/frontend/led_driver checks that a freed driver is not called and what the init logs.
118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/* RetroArch - A frontend for libretro.
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string/stdstring.h>
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#include "led_driver.h"
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#include "led_defines.h"
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#include "../input/input_output_store.h"
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#include "../verbosity.h"
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static const led_driver_t *current_led_driver = NULL;
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/* A core's LED calls, held until the frame has run (see
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* input/input_output_store.h). One slot per LED. */
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static output_store_t led_store;
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/* Every LED index led_driver_set_led() accepts has a slot. */
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typedef char led_store_fits[(MAX_LEDS <= OUTPUT_STORE_SLOTS) ? 1 : -1];
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static void null_led_init(void) { }
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static void null_led_free(void) { }
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static void null_led_set(int led, int state) { }
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static const led_driver_t null_led_driver = {
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null_led_init,
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null_led_free,
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null_led_set,
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"null"
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};
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void led_driver_init(const char *led_driver)
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{
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const char *drivername = led_driver;
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if (!drivername)
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drivername = (const char*)"null";
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current_led_driver = &null_led_driver;
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/* Nothing stored is for this driver. */
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output_store_drop(&led_store);
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#ifdef HAVE_OVERLAY
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if (string_is_equal(drivername, "overlay"))
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current_led_driver = &overlay_led_driver;
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#endif
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#ifdef HAVE_RPILED
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if (string_is_equal(drivername, "rpi"))
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current_led_driver = &rpi_led_driver;
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if (string_is_equal(drivername, "sysled"))
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current_led_driver = &sys_led_driver;
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#endif
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#if (defined(_WIN32) && !defined(_XBOX) && !defined(__WINRT__)) || defined(HAVE_X11)
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if (string_is_equal(drivername, "keyboard"))
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current_led_driver = &keyboard_led_driver;
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#endif
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(*current_led_driver->init)();
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if (current_led_driver != &null_led_driver)
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RARCH_LOG("[LED] Using driver: \"%s\".\n", current_led_driver->ident);
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}
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void led_driver_free(void)
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{
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/* What the core last asked for is applied before the driver puts
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* things back the way it found them. */
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led_driver_flush();
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if (current_led_driver)
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(*current_led_driver->free)();
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current_led_driver = NULL;
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}
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/* Used by RETRO_ENVIRONMENT_GET_LED_INTERFACE.
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*
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* The state is stored, not written: a core calls this from inside
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* retro_run(), and each call used to be a driver write on the core's
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* own stack - a sysfs open, write and close, an X11 round trip, an
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* injected key press. led_driver_flush() writes the frame's last
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* state once the core has run. */
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void led_driver_set_led(int led, int value)
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{
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/* Every driver drops an index outside this range. */
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if (led < 0 || led >= MAX_LEDS)
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return;
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output_store_post(&led_store, (unsigned)led, value != 0);
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}
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static void led_driver_write(unsigned led, int value, void *userdata)
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{
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if (current_led_driver)
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(*current_led_driver->set_led)((int)led, value);
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}
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/* Write what the core's LED calls left this frame: one driver call for
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* each LED it set, with the last state. Main thread, with the core off
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* the stack. */
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void led_driver_flush(void)
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{
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if (output_store_pending(&led_store))
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output_store_take(&led_store, led_driver_write, NULL);
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}
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