kernel/pipes: read & write support

1 files changed, 41 insertions, 0 deletions

diff --git a/src/init/tests/pipe.c b/src/init/tests/pipe.c
new file mode 100644
index 0000000..bbfe79a
--- /dev/null
+++ b/src/init/tests/pipe.c
@@ -0,0 +1,41 @@
+#define TEST_MACROS
+#include <init/stdlib.h>
+#include <init/tests/main.h>
+#include <shared/flags.h>
+#include <shared/syscalls.h>
+
+static const char *pipe_msgs[2] = {"hello", "world"};
+
+static void test_pipe_child(handle_t pipe) {
+	int ret = _syscall_write(pipe, pipe_msgs[0], 5, -1);
+	assert(ret == 5);
+
+	ret = _syscall_write(pipe, pipe_msgs[1], 5, -1);
+	assert(ret == 5);
+}
+
+static void test_pipe_parent(handle_t pipe) {
+	char buf[16];
+	int ret = _syscall_read(pipe, buf, 16, 0);
+	assert(ret == 5);
+	assert(!memcmp(buf, pipe_msgs[0], 5));
+
+	_syscall_read(pipe, buf, 16, 0);
+	assert(ret == 5);
+	assert(!memcmp(buf, pipe_msgs[1], 5)); // wrong compare for test
+}
+
+void test_pipe(void) {
+	handle_t pipe = _syscall_pipe(0);
+	assert(pipe > 0);
+
+	if (!_syscall_fork(0, NULL)) {
+		test_pipe_child(pipe);
+		_syscall_exit(0);
+	} else {
+		test_pipe_parent(pipe);
+		_syscall_await();
+	}
+
+	// TODO kill process that's waiting on a pipe
+}