2020-06-24 09:27:31 -04:00
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# wasi
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This module provides an implementation of the WebAssembly System Interface
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## Supported Syscalls
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2020-06-24 17:03:40 -04:00
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### wasi_snapshot_preview1
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- [x] args_get
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- [x] args_sizes_get
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- [x] environ_get
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- [x] environ_sizes_get
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- [x] clock_res_get
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- [x] clock_time_get
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- [ ] fd_advise
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- [ ] fd_allocate
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- [x] fd_close
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2020-06-29 10:44:08 -04:00
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- [x] fd_datasync
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2020-06-24 17:03:40 -04:00
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- [x] fd_fdstat_get
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- [ ] fd_fdstat_set_flags
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- [ ] fd_fdstat_set_rights
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2020-06-29 09:34:18 -04:00
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- [x] fd_filestat_get
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2020-06-29 14:36:22 -04:00
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- [x] fd_filestat_set_size
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2020-06-24 17:03:40 -04:00
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- [x] fd_filestat_set_times
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- [x] fd_pread
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- [x] fd_prestat_get
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- [x] fd_prestat_dir_name
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- [x] fd_pwrite
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- [x] fd_read
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- [ ] fd_readdir
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- [x] fd_renumber
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- [x] fd_seek
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2020-06-29 17:45:39 -04:00
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- [x] fd_sync
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2020-06-24 17:03:40 -04:00
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- [x] fd_tell
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- [x] fd_write
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- [x] path_create_directory
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- [x] path_filestat_get
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- [x] path_filestat_set_times
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- [x] path_link
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- [x] path_open
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- [x] path_readlink
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- [x] path_remove_directory
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- [x] path_rename
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- [x] path_symlink
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- [x] path_unlink_file
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- [x] poll_oneoff
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- [x] proc_exit
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- [ ] proc_raise
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- [ ] sched_yield
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- [x] random_get
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- [ ] sock_recv
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- [ ] sock_send
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- [ ] sock_shutdown
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2020-06-24 09:27:31 -04:00
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## Usage
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```typescript
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import WASI from "https://deno.land/std/wasi/snapshot_preview1.ts";
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const wasi = new WASI({
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args: Deno.args,
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env: Deno.env,
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});
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2020-06-24 22:21:39 -04:00
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const binary = await Deno.readFile("path/to/your/module.wasm");
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2020-06-24 09:27:31 -04:00
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const module = await WebAssembly.compile(binary);
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const instance = await WebAssembly.instantiate(module, {
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wasi_snapshot_preview1: wasi.exports,
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});
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wasi.memory = module.exports.memory;
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if (module.exports._start) {
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instance.exports._start();
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} else if (module.exports._initialize) {
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instance.exports._initialize();
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} else {
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throw new Error("No entry point found");
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}
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```
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## Testing
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The test suite for this module spawns rustc processes to compile various example
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Rust programs. You must have wasm targets enabled:
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```
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rustup target add wasm32-wasi
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rustup target add wasm32-unknown-unknown
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```
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