mgba_sgb, shutdown fix

after latest picoarch update, mgba is 50% smaller and uses less memory.
mgba_sgb bifurcated to a standalone core, which is half the size.

hopefully fixed the poweroff screen getting stuck, in short: fork bad vfork good.

mgba savestates on 32MB roms seem to work fine now, provided that the rom is stored in unpacked form.

commits.txt

@@ -1,7 +1,7 @@
 5e600602  DinguxCommander
 c57a554b  SDL-1.2
 c320273d  dropbear-embedded
-fb7d4e59  picoarch
+ee40c1cc  picoarch
 76e45c34  libpicofe
 88252880  libretro-common
 15efb9df  st-sdl
@@ -15,7 +15,8 @@ ad2c71d8  fceumm
 a9376c86  gpsp
 720b8ad4  mame2000
 75c658cc  mednafen_supafaust
-314bf7b6  mgba
+5d48e074  mgba
+5d48e074  mgba_sgb
 1f371e51  nxengine
 1ebc39a1  pcsx_rearmed
 44a6c678  picodrive

extras/Emus/SGB.pak/launch.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-EMU_EXE=mgba
+EMU_EXE=mgba_sgb
 PERF_LEVEL=performance
 CORES_PATH=$(dirname "$0")
 

makefile

@@ -130,7 +130,7 @@ payload:
 	cp ./third-party/picoarch/output/beetle-supergrafx_libretro.so ./build/EXTRAS/Emus/SGX.pak/mednafen_supergrafx_libretro.so
 	cp ./third-party/picoarch/output/pokemini_libretro.so ./build/EXTRAS/Emus/PKM.pak/
 	cp ./third-party/picoarch/output/mgba_libretro.so ./build/EXTRAS/Emus/MGBA.pak/
-	cp ./third-party/picoarch/output/mgba_libretro.so ./build/EXTRAS/Emus/SGB.pak/
+	cp ./third-party/picoarch/output/mgba_sgb_libretro.so ./build/EXTRAS/Emus/SGB.pak/
 	cp ./third-party/picoarch/output/fake-08_libretro.so ./build/EXTRAS/Emus/P8.pak/
 	cp ./third-party/picoarch/output/smsplus-gx_libretro.so ./build/EXTRAS/Emus/GG.pak/smsplus_libretro.so
 	cp ./third-party/picoarch/output/mame2000_libretro.so ./build/EXTRAS/Emus/MAME.pak/

src/common/common.c

@@ -894,13 +894,17 @@ int preventAutosleep(void) {
 
 void powerOff(void) {
 	if (can_poweroff) {
+		pid_t pid = -1;
 		char* msg = exists(kAutoResumePath) ? "Quicksave created,\npowering off" : "Powering off";
 		SDL_FillRect(screen, NULL, 0);
 		GFX_blitBodyCopy(screen, msg, 0,0,Screen.width,Screen.height);
 		SDL_Flip(screen);
 		sleep(1);
-		system("shutdown");
-		while (1) pause();
+		while (pid < 0) {
+			pid = vfork();
+		}
+		if (pid == 0) execlp("shutdown", "shutdown", NULL);
+		_exit(0);
 	}
 }