wasi: introduce initial WASI support

Co-authored-by: Gus Caplan <me@gus.host>
Co-authored-by: Daniel Bevenius <daniel.bevenius@gmail.com>
Co-authored-by: Jiawen Geng <technicalcute@gmail.com>
Co-authored-by: Tobias Nießen <tniessen@tnie.de>
Co-authored-by: Chengzhong Wu <legendecas@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/30258
Refs: https://github.com/nodejs/node/pull/27850
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Wyatt Preul <wpreul@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/deps/uvwasi/include/fd_table.h b/deps/uvwasi/include/fd_table.h
new file mode 100644
index 0000000000..ef87a3ff8f
--- /dev/null
+++ b/deps/uvwasi/include/fd_table.h
@@ -0,0 +1,60 @@
+#ifndef __UVWASI_FD_TABLE_H__
+#define __UVWASI_FD_TABLE_H__
+
+#include <stdint.h>
+#include "uv.h"
+#include "wasi_types.h"
+#include "uv_mapping.h"
+
+/* TODO(cjihrig): PATH_MAX_BYTES shouldn't be stack allocated. On Windows, paths
+   can be 32k long, and this PATH_MAX_BYTES is an artificial limitation. */
+#ifdef _WIN32
+/* MAX_PATH is in characters, not bytes. Make sure we have enough headroom. */
+# define PATH_MAX_BYTES (MAX_PATH * 4)
+#else
+# include <limits.h>
+# define PATH_MAX_BYTES (PATH_MAX)
+#endif
+
+
+struct uvwasi_fd_wrap_t {
+  uvwasi_fd_t id;
+  uv_file fd;
+  char path[PATH_MAX_BYTES];
+  char real_path[PATH_MAX_BYTES];
+  uvwasi_filetype_t type;
+  uvwasi_rights_t rights_base;
+  uvwasi_rights_t rights_inheriting;
+  int preopen;
+  int valid;
+};
+
+struct uvwasi_fd_table_t {
+  struct uvwasi_fd_wrap_t* fds;
+  uint32_t size;
+  uint32_t used;
+};
+
+uvwasi_errno_t uvwasi_fd_table_init(struct uvwasi_fd_table_t* table,
+                                    uint32_t init_size);
+void uvwasi_fd_table_free(struct uvwasi_fd_table_t* table);
+uvwasi_errno_t uvwasi_fd_table_insert_preopen(struct uvwasi_fd_table_t* table,
+                                              const uv_file fd,
+                                              const char* path,
+                                              const char* real_path);
+uvwasi_errno_t uvwasi_fd_table_insert_fd(struct uvwasi_fd_table_t* table,
+                                         const uv_file fd,
+                                         const int flags,
+                                         const char* path,
+                                         uvwasi_rights_t rights_base,
+                                         uvwasi_rights_t rights_inheriting,
+                                         struct uvwasi_fd_wrap_t* wrap);
+uvwasi_errno_t uvwasi_fd_table_get(const struct uvwasi_fd_table_t* table,
+                                   const uvwasi_fd_t id,
+                                   struct uvwasi_fd_wrap_t** wrap,
+                                   uvwasi_rights_t rights_base,
+                                   uvwasi_rights_t rights_inheriting);
+uvwasi_errno_t uvwasi_fd_table_remove(struct uvwasi_fd_table_t* table,
+                                      const uvwasi_fd_t id);
+
+#endif /* __UVWASI_FD_TABLE_H__ */