Userland test programs

host/Makefile

@@ -3,14 +3,10 @@ ccflags-y := -Wno-declaration-after-statement -std=gnu99
 
 .PHONY: all clean
 
-all: hello.ko ins_rm_mod.out
+all: hello.ko
 
 hello.ko: hello.c
 	make -C '/lib/modules/$(shell uname -r)/build' M='$(PWD)' modules
 
 clean:
 	make -C '/lib/modules/$(shell uname -r)/build' M='$(PWD)' clean
-	rm -f ins_rm_mod.out
-
-ins_rm_mod.out: ins_rm_mod.c hello.c
-	gcc -Wall -std=gnu99 -o ins_rm_mod.out ins_rm_mod.c

host/README.md

@@ -3,7 +3,6 @@
 Simple things that can be demonstrated by inserting a module into the currently running host. Tested on Ubuntu 16.04.
 
 1. [hello](hello.c)
-1. [ins_rm_mod.c](ins_rm_mod.c)
 
 ## Rationale
 
@@ -34,7 +33,3 @@ Build, insert and remove a hello world module:
 
     # Last message should be: cleanup_module
     dmest -T
-
-Insert and remove the `hello.ko` module from a C program with system calls:
-
-	sudo ./ins_rm_mod.out

kernel_module/Makefile

@@ -1,10 +1,13 @@
 obj-m += $(addsuffix .o, $(notdir $(basename $(wildcard $(BR2_EXTERNAL_KERNEL_MODULE_PATH)/*.c))))
 ccflags-y := -Wno-declaration-after-statement -std=gnu99
 
-.PHONY: all clean
+.PHONY: all clean test
 
-all:
+all: test
 	$(MAKE) -C '$(LINUX_DIR)' M='$(PWD)' modules
 
 clean:
 	$(MAKE) -C '$(LINUX_DIR)' M='$(PWD)' clean
+
+test:
+	$(MAKE) -C '$(PWD)/test'

kernel_module/delay.c

@@ -43,7 +43,9 @@ void cleanup_module(void)
 {
 	/* This waits for the work to finish. From docstring: */
 	/* > Cancel @work and wait for its execution to finish. */
-	cancel_work_sync(&work);
+	cancel_work(&work);
+
+	/*cancel_work(&work);*/
 
 	destroy_workqueue(queue);
 }

kernel_module/external.mk

@@ -13,7 +13,8 @@ define KERNEL_MODULE_BUILD_CMDS
 endef
 
 define KERNEL_MODULE_INSTALL_TARGET_CMDS
-	$(INSTALL) -D -m 0755 $(@D)/*.ko '$(TARGET_DIR)'
+	$(INSTALL) -D -m 0655 $(@D)/*.ko '$(TARGET_DIR)'
+	$(INSTALL) -D -m 0755 $(@D)/test/ins_rm_mod '$(TARGET_DIR)'
 endef
 
 $(eval $(kernel-module))

kernel_module/test/Makefile

@@ -0,0 +1,9 @@
+CC = gcc
+
+.PHONY: clean
+
+ins_rm_mod: ins_rm_mod.c
+	$(CC) -o '$@' '$<'
+
+clean:
+	rm ins_rm_mod

kernel_module/test/README.md

@@ -0,0 +1,9 @@
+# Test
+
+Userland C programs used to test our kernel module.
+
+`sh` programs are simpler, and installed copied directly with an overlay.
+
+C programs require cross compiling, but give us more control over system calls.
+
+These programs can also be compiled and used on host.