user/logfs: a simple demo of the fs api

1 files changed, 34 insertions, 0 deletions

diff --git a/src/user/app/logfs/logfs.c b/src/user/app/logfs/logfs.c
new file mode 100644
index 0000000..ba25564
--- /dev/null
+++ b/src/user/app/logfs/logfs.c
@@ -0,0 +1,34 @@
+#include <camellia.h>
+#include <camellia/syscalls.h>
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <user/lib/fs/misc.h>
+
+_Noreturn void fs(void) {
+	const size_t buflen = 1024;
+	char *buf = malloc(buflen);
+	if (!buf) err(1, "malloc");
+	for (;;) {
+		struct ufs_request req;
+		handle_t reqh = ufs_wait(buf, buflen, &req);
+		if (reqh < 0) errx(1, "ufs_wait error");
+
+		switch (req.op) {
+			case VFSOP_OPEN:
+				printf("[logfs] open(\"%s\", 0x%x)\n", buf, req.flags);
+				forward_open(reqh, buf, req.len, req.flags);
+				break;
+			default:
+				/* Unsupported vfs operation.
+				 * Currently if you never create your own file descriptors you won't receive
+				 * anything but VFSOP_OPEN, but it's idiomatic to handle this anyways. */
+				_syscall_fs_respond(reqh, NULL, -1, 0);
+				break;
+		}
+	}
+}
+
+int main(void) {
+	fs();
+}