[#47550] Add mount syscall

c_lib/wasi_ext_lib.c

@@ -39,6 +39,42 @@ int __syscall(const char *command, char *args, uint8_t *output_buf,
     return err;
 }
 
+int wasi_ext_mount(int source_fd, const char *source_path, int target_fd,
+                   const char *target_path, const char *filesystem_type,
+                   uint64_t mount_flags, const char *data) {
+    JsonNode *root = json_mkobject();
+
+    json_append_member(root, "source_fd", json_mknumber((double)source_fd));
+    json_append_member(root, "source",
+                       json_mknumber((double)(size_t)source_path));
+    json_append_member(root, "source_len",
+                       json_mknumber((double)strlen(source_path)));
+
+    json_append_member(root, "target_fd", json_mknumber((double)target_fd));
+    json_append_member(root, "target",
+                       json_mknumber((double)(size_t)target_path));
+    json_append_member(root, "target_len",
+                       json_mknumber((double)strlen(target_path)));
+
+    json_append_member(root, "filesystemtype",
+                       json_mknumber((double)(size_t)filesystem_type));
+    json_append_member(root, "filesystemtype_len",
+                       json_mknumber((double)strlen(filesystem_type)));
+
+    json_append_member(root, "mountflags", json_mknumber((double)mount_flags));
+
+    json_append_member(root, "data", json_mknumber((double)(size_t)data));
+    json_append_member(root, "data_len", json_mknumber((double)strlen(data)));
+
+    char *serialized = json_stringify(0, root, " ");
+    json_delete(root);
+
+    int err = __syscall("mount", serialized, NULL, 0);
+    free(serialized);
+
+    return err;
+}
+
 int wasi_ext_chdir(const char *path) {
     // wasi lib doesn't support realpath, so the given path must be
     // canonicalized

c_lib/wasi_ext_lib.h

@@ -104,5 +104,6 @@ int wasi_ext_spawn(const char *, const char *const *, size_t,
 int wasi_ext_kill(int, int);
 int wasi_ext_ioctl(int, unsigned int, void *);
 int wasi_ext_fcntl(int, enum FcntlCommand, void *);
-
+int wasi_ext_mount(int, const char *, int, const char *, const char *, uint64_t,
+                   const char *);
 #endif

src/lib.rs

@@ -337,3 +337,37 @@ pub fn fcntl(fd: wasi::Fd, cmd: FcntlCommand) -> Result<i32, ExitCode> {
         Ok(result)
     }
 }
+
+pub fn mount(
+    source_fd: RawFd,
+    source_path: &str,
+    target_fd: RawFd,
+    target_path: &str,
+    filesystem_type: &str,
+    opts: u64,
+    data: &str,
+) -> Result<(), ExitCode> {
+    let c_source_path = CString::new(source_path).unwrap();
+    let c_target_path = CString::new(target_path).unwrap();
+
+    let c_filesystem_type = CString::new(filesystem_type).unwrap();
+    let c_data = CString::new(data).unwrap();
+
+    let result = unsafe {
+        wasi_ext_lib_generated::wasi_ext_mount(
+            source_fd,
+            c_source_path.as_ptr() as *const i8,
+            target_fd,
+            c_target_path.as_ptr() as *const i8,
+            c_filesystem_type.as_ptr() as *const i8,
+            opts,
+            c_data.as_ptr() as *const i8,
+        )
+    };
+
+    if result == 0 {
+        Ok(())
+    } else {
+        Err(result)
+    }
+}