closecrash.plist

{ Filter = { Bundles = ( "com.apple.mobilemail" ); }; }

control

Package: net.joedj.closecrash
Name: closecrash
Depends: firmware (>= 4.3), mobilesubstrate (>= 0.9.5000)
Version: 0.0.1
Architecture: iphoneos-arm
Description: crashy crash
Maintainer: joedj
Author: joedj
Section: Tweaks

Makefile

DEBUG=1

TARGET := iphone:clang::4.3
ARCHS := armv7 arm64

ifdef CCC_ANALYZER_OUTPUT_FORMAT
  TARGET_CXX = $(CXX)
  TARGET_LD = $(TARGET_CXX)
endif

ADDITIONAL_LDFLAGS += -Wl,-map,$@.map -x c /dev/null -x none

TWEAK_NAME = closecrash
closecrash_FILES = Tweak.c

include theos/makefiles/common.mk
include $(THEOS_MAKE_PATH)/tweak.mk

after-install::
	install.exec "killall -9 MobileMail"

Tweak.c

#include <substrate.h>
#include <unistd.h>

MSHook(int, close, int fildes) {
    return _close(fildes);
}

static __attribute__((constructor)) void init() {
    MSHookFunction(close, $close, (void **)&_close);
}