working pipe

lab6/Makefile

@@ -1,14 +1,13 @@
 obj-m += mypipe.o
 OUT_DIR := build
 
-.PHONY: all kern_mod install uninstall clean
+.PHONY: all kern_mod install uninstall clean reader writer
 
 all: kern_mod
 	@true
 
 kern_mod: mypipe.c
-	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) MO=$(PWD)/build
-
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) MO=$(PWD)/build/kern
 
 install:
 	insmod ./build/mypipe.ko
@@ -16,6 +15,14 @@ install:
 uninstall:
 	rmmod mypipe
 
+reader:
+	mkdir -p $(OUT_DIR)
+	gcc pipe_read.c -o $(OUT_DIR)/pread
+
+writer:
+	mkdir -p $(OUT_DIR)
+	gcc pipe_write.c -o $(OUT_DIR)/pwrite
+
 clean:
 	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
 	rm -rf $(OUT_DIR)

lab6/pipe_read.c

@@ -0,0 +1,24 @@
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main() {
+    int fd = open("/dev/wendy_out", O_RDONLY);
+    if (fd < 0) {
+        printf("Error open pipe");
+        return 1;
+    }
+
+    char buf[128];
+    ssize_t n = read(fd, buf, sizeof(buf) - 1);
+    if (n < 0) {
+        printf("Error read pipe");
+        return 1;
+    }
+
+    buf[n] = '\0';
+    printf("Reader received: %s", buf);
+
+    close(fd);
+    return 0;
+}

lab6/pipe_tester.cpp

@@ -0,0 +1,5 @@
+#include <iostream>
+
+int main() {
+    
+}

lab6/pipe_write.c

@@ -0,0 +1,18 @@
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+
+int main() {
+    int fd = open("/dev/wendy_in", O_WRONLY);
+    if (fd < 0) {
+        printf("Error open pipe");
+        return 1;
+    }
+
+    const char *msg = "Hello from the other side!\n";
+    write(fd, msg, strlen(msg));
+
+    close(fd);
+    return 0;
+}