user/lib: ufs_wait

2 files changed, 24 insertions, 0 deletions

diff --git a/src/user/lib/fs/misc.c b/src/user/lib/fs/misc.c
index 3a04649..7a66b80 100644
--- a/src/user/lib/fs/misc.c
+++ b/src/user/lib/fs/misc.c
@@ -1,5 +1,6 @@
 #include <camellia/flags.h>
 #include <camellia/syscalls.h>
+#include <errno.h>
 #include <shared/mem.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -289,6 +290,24 @@ void fs_dir_inject(const char *path) {
 	exit(0);
 }
 
+handle_t ufs_wait(char *buf, size_t len, struct ufs_request *req) {
+	handle_t reqh;
+	for (;;) {
+		reqh = _syscall_fs_wait(buf, len, req);
+		if (reqh < 0) break;
+		if (req->op == VFSOP_OPEN) {
+			if (req->len == len) {
+				_syscall_fs_respond(reqh, NULL, -ENAMETOOLONG, 0);
+				continue;
+			}
+			buf[req->len] = '\0';
+			// TODO ensure passed paths don't have null bytes in them in the kernel
+		}
+		break;
+	}
+	return reqh;
+}
+
 bool mount_at_pred(const char *path) {
 	// TODO preprocess path - simplify & ensure trailing slash
 	if (!fork2_n_mount(path)) {
diff --git a/src/user/lib/fs/misc.h b/src/user/lib/fs/misc.h
index d90100d..35184e1 100644
--- a/src/user/lib/fs/misc.h
+++ b/src/user/lib/fs/misc.h
@@ -14,5 +14,10 @@ void fs_dir_inject(const char *path);
 
 bool mount_at_pred(const char *path);
 
+// TODO separate fs drivers and wrappers around syscalls
+
+/** like _syscall_fs_wait, but ensures *buf is a null terminated string on VFSOP_OPEN */
+handle_t ufs_wait(char *buf, size_t len, struct ufs_request *req);
+
 /** Mounts something and injects its path into the fs */
 #define MOUNT_AT(path) for (; mount_at_pred(path); exit(1))