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wasi.ts
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wasi.ts
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/* MIT licensed. See README.md for copyright and history information.
For API docs about what these functions below are supposed to be, see
https://github.com/WebAssembly/WASI/blob/main/phases/snapshot/docs.md
and a TODO is copy/paste most of that as comments below.
*/
import debug from "debug";
const log = debug("wasi");
const logOpen = debug("wasi:open"); // just log opening files, which is useful
// See the comment in packages/cpython/src/pyconfig.h
// In particular, until we patch cpython itself, it's really
// only safe to set this to 256. TODO: we plan to patch
// everything in cpython that falls back to 256 to instead
// use the value 32768.
const SC_OPEN_MAX = 32768;
import type {
WASIBindings,
WASIArgs,
WASIEnv,
WASIPreopenedDirs,
WASIConfig,
File,
} from "./types";
import { WASIError } from "./types";
import toBuffer from "typedarray-to-buffer";
import {
WASI_ESUCCESS,
WASI_EBADF,
WASI_EINVAL,
WASI_ENOSYS,
WASI_EPERM,
//WASI_ENOTCAPABLE,
WASI_FILETYPE_UNKNOWN,
WASI_FILETYPE_BLOCK_DEVICE,
WASI_FILETYPE_CHARACTER_DEVICE,
WASI_FILETYPE_DIRECTORY,
WASI_FILETYPE_REGULAR_FILE,
WASI_FILETYPE_SOCKET_STREAM,
WASI_FILETYPE_SYMBOLIC_LINK,
WASI_FILETYPE,
WASI_FDFLAG_APPEND,
WASI_FDFLAG_DSYNC,
WASI_FDFLAG_NONBLOCK,
WASI_FDFLAG_RSYNC,
WASI_FDFLAG_SYNC,
WASI_RIGHT_FD_DATASYNC,
WASI_RIGHT_FD_READ,
WASI_RIGHT_FD_SEEK,
WASI_RIGHT_FD_FDSTAT_SET_FLAGS,
WASI_RIGHT_FD_SYNC,
WASI_RIGHT_FD_TELL,
WASI_RIGHT_FD_WRITE,
WASI_RIGHT_FD_ADVISE,
WASI_RIGHT_FD_ALLOCATE,
WASI_RIGHT_PATH_CREATE_DIRECTORY,
WASI_RIGHT_PATH_CREATE_FILE,
WASI_RIGHT_PATH_LINK_SOURCE,
WASI_RIGHT_PATH_LINK_TARGET,
WASI_RIGHT_PATH_OPEN,
WASI_RIGHT_FD_READDIR,
WASI_RIGHT_PATH_READLINK,
WASI_RIGHT_PATH_RENAME_SOURCE,
WASI_RIGHT_PATH_RENAME_TARGET,
WASI_RIGHT_PATH_FILESTAT_GET,
WASI_RIGHT_PATH_FILESTAT_SET_SIZE,
WASI_RIGHT_PATH_FILESTAT_SET_TIMES,
WASI_RIGHT_FD_FILESTAT_GET,
WASI_RIGHT_FD_FILESTAT_SET_SIZE,
WASI_RIGHT_FD_FILESTAT_SET_TIMES,
WASI_RIGHT_PATH_SYMLINK,
WASI_RIGHT_PATH_REMOVE_DIRECTORY,
WASI_RIGHT_POLL_FD_READWRITE,
WASI_RIGHT_PATH_UNLINK_FILE,
RIGHTS_BLOCK_DEVICE_BASE,
RIGHTS_BLOCK_DEVICE_INHERITING,
RIGHTS_CHARACTER_DEVICE_BASE,
RIGHTS_CHARACTER_DEVICE_INHERITING,
RIGHTS_REGULAR_FILE_BASE,
RIGHTS_REGULAR_FILE_INHERITING,
RIGHTS_DIRECTORY_BASE,
RIGHTS_DIRECTORY_INHERITING,
RIGHTS_SOCKET_BASE,
RIGHTS_SOCKET_INHERITING,
RIGHTS_TTY_BASE,
RIGHTS_TTY_INHERITING,
WASI_CLOCK_MONOTONIC,
WASI_CLOCK_PROCESS_CPUTIME_ID,
WASI_CLOCK_REALTIME,
WASI_CLOCK_THREAD_CPUTIME_ID,
WASI_EVENTTYPE_CLOCK,
WASI_EVENTTYPE_FD_READ,
WASI_EVENTTYPE_FD_WRITE,
WASI_FILESTAT_SET_ATIM,
WASI_FILESTAT_SET_ATIM_NOW,
WASI_FILESTAT_SET_MTIM,
WASI_FILESTAT_SET_MTIM_NOW,
WASI_O_CREAT,
WASI_O_DIRECTORY,
WASI_O_EXCL,
WASI_O_TRUNC,
WASI_PREOPENTYPE_DIR,
WASI_STDIN_FILENO,
WASI_STDOUT_FILENO,
WASI_STDERR_FILENO,
ERROR_MAP,
SIGNAL_MAP,
WASI_WHENCE_CUR,
WASI_WHENCE_END,
WASI_WHENCE_SET,
} from "./constants";
const STDIN_DEFAULT_RIGHTS =
WASI_RIGHT_FD_DATASYNC |
WASI_RIGHT_FD_READ |
WASI_RIGHT_FD_SYNC |
WASI_RIGHT_FD_ADVISE |
WASI_RIGHT_FD_FILESTAT_GET |
WASI_RIGHT_POLL_FD_READWRITE;
const STDOUT_DEFAULT_RIGHTS =
WASI_RIGHT_FD_DATASYNC |
WASI_RIGHT_FD_WRITE |
WASI_RIGHT_FD_SYNC |
WASI_RIGHT_FD_ADVISE |
WASI_RIGHT_FD_FILESTAT_GET |
WASI_RIGHT_POLL_FD_READWRITE;
const STDERR_DEFAULT_RIGHTS = STDOUT_DEFAULT_RIGHTS;
// I don't know what this *should* be, but I'm
// adding things as they are expected/implemented.
export const SOCKET_DEFAULT_RIGHTS =
WASI_RIGHT_FD_DATASYNC |
WASI_RIGHT_FD_READ |
WASI_RIGHT_FD_WRITE |
WASI_RIGHT_FD_ADVISE |
WASI_RIGHT_FD_FILESTAT_GET |
WASI_RIGHT_POLL_FD_READWRITE |
WASI_RIGHT_FD_FDSTAT_SET_FLAGS;
const msToNs = (ms: number) => {
const msInt = Math.trunc(ms);
const decimal = BigInt(Math.round((ms - msInt) * 1000000));
const ns = BigInt(msInt) * BigInt(1000000);
return ns + decimal;
};
const nsToMs = (ns: number | bigint) => {
if (typeof ns === "number") {
ns = Math.trunc(ns);
}
const nsInt = BigInt(ns);
return Number(nsInt / BigInt(1000000));
};
const wrap =
<T extends Function>(f: T) =>
(...args: any[]) => {
try {
return f(...args);
} catch (err) {
// log("WASI error", err);
// console.trace(err);
let e: any = err;
// This is to support unionfs, e.g., in fd_write if a pipe
// breaks, then unionfs raises "Error: EBADF: bad file descriptor, write",
// but the relevant error is "prev: Error: EPIPE: broken pipe, write", which it saves.
while (e.prev != null) {
e = e.prev;
}
// If it's an error from the fs
if (e?.code && typeof e?.code === "string") {
return ERROR_MAP[e.code] || WASI_EINVAL;
}
// If it's a WASI error, we return it directly
if (e instanceof WASIError) {
return e.errno;
}
// Otherwise we let the error bubble up
throw e;
}
};
const stat = (wasi: WASI, fd: number): File => {
const entry = wasi.FD_MAP.get(fd);
// console.log("stat", { fd, entry, FD_MAP: wasi.FD_MAP });
// log("stat", { fd, entry, FD_MAP: wasi.FD_MAP });
if (!entry) {
throw new WASIError(WASI_EBADF);
}
if (entry.filetype === undefined) {
const stats = wasi.fstatSync(entry.real);
const { filetype, rightsBase, rightsInheriting } = translateFileAttributes(
wasi,
fd,
stats
);
entry.filetype = filetype as WASI_FILETYPE;
if (!entry.rights) {
entry.rights = {
base: rightsBase,
inheriting: rightsInheriting,
};
}
}
return entry;
};
const translateFileAttributes = (
wasi: WASI,
fd: number | undefined,
stats: any
) => {
switch (true) {
case stats.isBlockDevice():
return {
filetype: WASI_FILETYPE_BLOCK_DEVICE,
rightsBase: RIGHTS_BLOCK_DEVICE_BASE,
rightsInheriting: RIGHTS_BLOCK_DEVICE_INHERITING,
};
case stats.isCharacterDevice(): {
const filetype = WASI_FILETYPE_CHARACTER_DEVICE;
if (fd !== undefined && wasi.bindings.isTTY(fd)) {
return {
filetype,
rightsBase: RIGHTS_TTY_BASE,
rightsInheriting: RIGHTS_TTY_INHERITING,
};
}
return {
filetype,
rightsBase: RIGHTS_CHARACTER_DEVICE_BASE,
rightsInheriting: RIGHTS_CHARACTER_DEVICE_INHERITING,
};
}
case stats.isDirectory():
return {
filetype: WASI_FILETYPE_DIRECTORY,
rightsBase: RIGHTS_DIRECTORY_BASE,
rightsInheriting: RIGHTS_DIRECTORY_INHERITING,
};
case stats.isFIFO():
return {
filetype: WASI_FILETYPE_SOCKET_STREAM,
rightsBase: RIGHTS_SOCKET_BASE,
rightsInheriting: RIGHTS_SOCKET_INHERITING,
};
case stats.isFile():
return {
filetype: WASI_FILETYPE_REGULAR_FILE,
rightsBase: RIGHTS_REGULAR_FILE_BASE,
rightsInheriting: RIGHTS_REGULAR_FILE_INHERITING,
};
case stats.isSocket():
return {
filetype: WASI_FILETYPE_SOCKET_STREAM,
rightsBase: RIGHTS_SOCKET_BASE,
rightsInheriting: RIGHTS_SOCKET_INHERITING,
};
case stats.isSymbolicLink():
return {
filetype: WASI_FILETYPE_SYMBOLIC_LINK,
rightsBase: BigInt(0),
rightsInheriting: BigInt(0),
};
default:
return {
filetype: WASI_FILETYPE_UNKNOWN,
rightsBase: BigInt(0),
rightsInheriting: BigInt(0),
};
}
};
type Exports = {
[key: string]: any;
};
// const logToFile = (...args) => {
// require("fs").appendFileSync(
// "/tmp/wasi.log",
// args.map((x) => `${x}`).join(" ") + "\n"
// );
// };
let warnedAboutSleep = false;
// The js side of the wasi state.
interface State {
env: WASIEnv;
FD_MAP: Map<number, File>;
bindings: WASIBindings;
}
export default class WASI {
memory: WebAssembly.Memory;
view: DataView;
FD_MAP: Map<number, File>;
wasiImport: Exports;
bindings: WASIBindings;
// This sleep is in milliseconds; it's NOT the libc sleep!
sleep?: (milliseconds: number) => void;
lastStdin: number = 0;
getStdin?: (milliseconds?: number) => Buffer; // timeout milliseconds is never used
stdinBuffer?: Buffer;
sendStdout?: (Buffer) => void;
sendStderr?: (Buffer) => void;
env: WASIEnv = {};
getState(): State {
return { env: this.env, FD_MAP: this.FD_MAP, bindings: this.bindings };
}
setState(state: State) {
this.env = state.env;
this.FD_MAP = state.FD_MAP;
this.bindings = state.bindings;
}
fstatSync(real_fd: number) {
if (real_fd <= 2) {
try {
return this.bindings.fs.fstatSync(real_fd);
} catch (_) {
// In special case of stdin/stdout/stderr in some environments
// (e.g., windows under electron) some of the actual file descriptors
// aren't defined in the node process. We thus fake it, since we
// are virtualizing these in our code anyways.
const now = new Date();
return {
dev: 0,
mode: 8592,
nlink: 1,
uid: 0,
gid: 0,
rdev: 0,
blksize: 65536,
ino: 0,
size: 0,
blocks: 0,
atimeMs: now.valueOf(),
mtimeMs: now.valueOf(),
ctimeMs: now.valueOf(),
birthtimeMs: 0,
atime: new Date(),
mtime: new Date(),
ctime: new Date(),
birthtime: new Date(0),
};
}
}
// general case
return this.bindings.fs.fstatSync(real_fd);
}
constructor(wasiConfig: WASIConfig) {
this.sleep = wasiConfig.sleep;
this.getStdin = wasiConfig.getStdin;
this.sendStdout = wasiConfig.sendStdout;
this.sendStderr = wasiConfig.sendStderr;
// Destructure our wasiConfig
let preopens: WASIPreopenedDirs = {};
if (wasiConfig.preopens) {
preopens = wasiConfig.preopens;
}
if (wasiConfig && wasiConfig.env) {
this.env = wasiConfig.env;
}
let args: WASIArgs = [];
if (wasiConfig && wasiConfig.args) {
args = wasiConfig.args;
}
// @ts-ignore
this.memory = undefined;
// @ts-ignore
this.view = undefined;
this.bindings = wasiConfig.bindings;
const fs = this.bindings.fs;
this.FD_MAP = new Map([
[
WASI_STDIN_FILENO,
{
real: 0,
filetype: WASI_FILETYPE_CHARACTER_DEVICE,
// offset: BigInt(0),
rights: {
base: STDIN_DEFAULT_RIGHTS,
inheriting: BigInt(0),
},
path: "/dev/stdin",
},
],
[
WASI_STDOUT_FILENO,
{
real: 1,
filetype: WASI_FILETYPE_CHARACTER_DEVICE,
// offset: BigInt(0),
rights: {
base: STDOUT_DEFAULT_RIGHTS,
inheriting: BigInt(0),
},
path: "/dev/stdout",
},
],
[
WASI_STDERR_FILENO,
{
real: 2,
filetype: WASI_FILETYPE_CHARACTER_DEVICE,
// offset: BigInt(0),
rights: {
base: STDERR_DEFAULT_RIGHTS,
inheriting: BigInt(0),
},
path: "/dev/stderr",
},
],
]);
const path = this.bindings.path;
for (const [k, v] of Object.entries(preopens)) {
const real = fs.openSync(v, fs.constants.O_RDONLY);
const newfd = this.getUnusedFileDescriptor();
this.FD_MAP.set(newfd, {
real,
filetype: WASI_FILETYPE_DIRECTORY,
// offset: BigInt(0),
rights: {
base: RIGHTS_DIRECTORY_BASE,
inheriting: RIGHTS_DIRECTORY_INHERITING,
},
fakePath: k,
path: v,
});
}
const getiovs = (iovs: number, iovsLen: number) => {
// iovs* -> [iov, iov, ...]
// __wasi_ciovec_t {
// void* buf,
// size_t buf_len,
// }
this.refreshMemory();
const buffers = Array.from({ length: iovsLen }, (_, i) => {
const ptr = iovs + i * 8;
const buf = this.view.getUint32(ptr, true);
let bufLen = this.view.getUint32(ptr + 4, true);
// the mmap stuff in wasi tries to make this overwrite all
// allocated memory, so we cap it or things crash.
// TODO: maybe we need to allocate more memory? I don't know!!
if (bufLen > this.memory.buffer.byteLength - buf) {
// console.log({
// buf,
// bufLen,
// total_memory: this.memory.buffer.byteLength,
// });
log("getiovs: warning -- truncating buffer to fit in memory");
bufLen = Math.min(
bufLen,
Math.max(0, this.memory.buffer.byteLength - buf)
);
}
try {
const buffer = new Uint8Array(this.memory.buffer, buf, bufLen);
return toBuffer(buffer);
} catch (err) {
// don't hide this
console.warn("WASI.getiovs -- invalid buffer", err);
// but at least make it so we don't totally kill WASM, so we
// get a traceback in the calling program (say python).
// TODO: Right now this sort of thing happens with aggressive use of mmap,
// but I plan to replace how mmap works with something that is viable.
throw new WASIError(WASI_EINVAL);
}
});
return buffers;
};
const CHECK_FD = (fd: number, rights: bigint) => {
// log("CHECK_FD", { fd, rights });
const stats = stat(this, fd);
// log("CHECK_FD", { stats });
if (rights !== BigInt(0) && (stats.rights.base & rights) === BigInt(0)) {
throw new WASIError(WASI_EPERM);
}
return stats;
};
const CPUTIME_START = this.bindings.hrtime();
const now = (clockId?: number) => {
switch (clockId) {
case WASI_CLOCK_MONOTONIC:
return this.bindings.hrtime();
case WASI_CLOCK_REALTIME:
return msToNs(Date.now());
case WASI_CLOCK_PROCESS_CPUTIME_ID:
case WASI_CLOCK_THREAD_CPUTIME_ID: // TODO -- this assumes 1 thread
return this.bindings.hrtime() - CPUTIME_START;
default:
return null;
}
};
this.wasiImport = {
args_get: (argv: number, argvBuf: number) => {
this.refreshMemory();
let coffset = argv;
let offset = argvBuf;
args.forEach((a) => {
this.view.setUint32(coffset, offset, true);
coffset += 4;
offset += Buffer.from(this.memory.buffer).write(`${a}\0`, offset);
});
return WASI_ESUCCESS;
},
args_sizes_get: (argc: number, argvBufSize: number) => {
this.refreshMemory();
this.view.setUint32(argc, args.length, true);
const size = args.reduce((acc, a) => acc + Buffer.byteLength(a) + 1, 0);
this.view.setUint32(argvBufSize, size, true);
return WASI_ESUCCESS;
},
environ_get: (environ: number, environBuf: number) => {
this.refreshMemory();
let coffset = environ;
let offset = environBuf;
Object.entries(this.env).forEach(([key, value]) => {
this.view.setUint32(coffset, offset, true);
coffset += 4;
offset += Buffer.from(this.memory.buffer).write(
`${key}=${value}\0`,
offset
);
});
return WASI_ESUCCESS;
},
environ_sizes_get: (environCount: number, environBufSize: number) => {
this.refreshMemory();
const envProcessed = Object.entries(this.env).map(
([key, value]) => `${key}=${value}\0`
);
const size = envProcessed.reduce(
(acc, e) => acc + Buffer.byteLength(e),
0
);
this.view.setUint32(environCount, envProcessed.length, true);
this.view.setUint32(environBufSize, size, true);
return WASI_ESUCCESS;
},
clock_res_get: (clockId: number, resolution: number) => {
let res;
switch (clockId) {
case WASI_CLOCK_MONOTONIC:
case WASI_CLOCK_PROCESS_CPUTIME_ID:
case WASI_CLOCK_THREAD_CPUTIME_ID: {
res = BigInt(1);
break;
}
case WASI_CLOCK_REALTIME: {
res = BigInt(1000);
break;
}
}
if (!res) {
throw Error("invalid clockId");
}
this.view.setBigUint64(resolution, res);
return WASI_ESUCCESS;
},
clock_time_get: (clockId: number, _precision: number, time: number) => {
this.refreshMemory();
const n = now(clockId);
if (n === null) {
return WASI_EINVAL;
}
this.view.setBigUint64(time, BigInt(n), true);
return WASI_ESUCCESS;
},
fd_advise: wrap(
(fd: number, _offset: number, _len: number, _advice: number) => {
CHECK_FD(fd, WASI_RIGHT_FD_ADVISE);
return WASI_ENOSYS;
}
),
fd_allocate: wrap((fd: number, _offset: number, _len: number) => {
CHECK_FD(fd, WASI_RIGHT_FD_ALLOCATE);
return WASI_ENOSYS;
}),
fd_close: wrap((fd: number) => {
const stats = CHECK_FD(fd, BigInt(0));
fs.closeSync(stats.real);
this.FD_MAP.delete(fd);
return WASI_ESUCCESS;
}),
fd_datasync: wrap((fd: number) => {
const stats = CHECK_FD(fd, WASI_RIGHT_FD_DATASYNC);
fs.fdatasyncSync(stats.real);
return WASI_ESUCCESS;
}),
fd_fdstat_get: wrap((fd: number, bufPtr: number) => {
const stats = CHECK_FD(fd, BigInt(0));
// console.log("fd_fdstat_get", fd, stats);
this.refreshMemory();
if (stats.filetype == null) {
throw Error("stats.filetype must be set");
}
this.view.setUint8(bufPtr, stats.filetype); // FILETYPE u8
this.view.setUint16(bufPtr + 2, 0, true); // FDFLAG u16
this.view.setUint16(bufPtr + 4, 0, true); // FDFLAG u16
this.view.setBigUint64(bufPtr + 8, BigInt(stats.rights.base), true); // u64
this.view.setBigUint64(
bufPtr + 8 + 8,
BigInt(stats.rights.inheriting),
true
); // u64
return WASI_ESUCCESS;
}),
/*
fd_fdstat_set_flags
Docs From upstream:
Adjust the flags associated with a file descriptor.
Note: This is similar to `fcntl(fd, F_SETFL, flags)` in POSIX.
This could be supported via posix-node in general (when available)
for sockets and stdin/stdout/stderr and genuine files (but not
for memfs, obviously). It's typically used by C programs for
locking files, but most importantly for us, for setting whether
reading from a fd is nonblocking (very important for stdin)
or should time out after a certain amount of time (e.g., very
important for a network socket).
For now we implement this in a very small number of cases
and return "Function not implemented" otherwise.
*/
fd_fdstat_set_flags: wrap((fd: number, flags: number) => {
// Are we allowed to set flags. This more means: "is it implemented?".
// Right now we only set this flag for sockets (that's done in the
// external kernel module in src/wasm/posix/socket.ts).
CHECK_FD(fd, WASI_RIGHT_FD_FDSTAT_SET_FLAGS);
if (this.wasiImport.sock_fcntlSetFlags(fd, flags) == 0) {
return WASI_ESUCCESS;
}
return WASI_ENOSYS;
}),
fd_fdstat_set_rights: wrap(
(fd: number, fsRightsBase: bigint, fsRightsInheriting: bigint) => {
const stats = CHECK_FD(fd, BigInt(0));
const nrb = stats.rights.base | fsRightsBase;
if (nrb > stats.rights.base) {
return WASI_EPERM;
}
const nri = stats.rights.inheriting | fsRightsInheriting;
if (nri > stats.rights.inheriting) {
return WASI_EPERM;
}
stats.rights.base = fsRightsBase;
stats.rights.inheriting = fsRightsInheriting;
return WASI_ESUCCESS;
}
),
fd_filestat_get: wrap((fd: number, bufPtr: number) => {
const stats = CHECK_FD(fd, WASI_RIGHT_FD_FILESTAT_GET);
const rstats = this.fstatSync(stats.real);
this.refreshMemory();
this.view.setBigUint64(bufPtr, BigInt(rstats.dev), true);
bufPtr += 8;
this.view.setBigUint64(bufPtr, BigInt(rstats.ino), true);
bufPtr += 8;
if (stats.filetype == null) {
throw Error("stats.filetype must be set");
}
this.view.setUint8(bufPtr, stats.filetype);
bufPtr += 8;
this.view.setBigUint64(bufPtr, BigInt(rstats.nlink), true);
bufPtr += 8;
this.view.setBigUint64(bufPtr, BigInt(rstats.size), true);
bufPtr += 8;
this.view.setBigUint64(bufPtr, msToNs(rstats.atimeMs), true);
bufPtr += 8;
this.view.setBigUint64(bufPtr, msToNs(rstats.mtimeMs), true);
bufPtr += 8;
this.view.setBigUint64(bufPtr, msToNs(rstats.ctimeMs), true);
return WASI_ESUCCESS;
}),
fd_filestat_set_size: wrap((fd: number, stSize: number) => {
const stats = CHECK_FD(fd, WASI_RIGHT_FD_FILESTAT_SET_SIZE);
fs.ftruncateSync(stats.real, Number(stSize));
return WASI_ESUCCESS;
}),
fd_filestat_set_times: wrap(
(fd: number, stAtim: number, stMtim: number, fstflags: number) => {
const stats = CHECK_FD(fd, WASI_RIGHT_FD_FILESTAT_SET_TIMES);
const rstats = this.fstatSync(stats.real);
let atim = rstats.atime;
let mtim = rstats.mtime;
const n = nsToMs(now(WASI_CLOCK_REALTIME)!);
const atimflags = WASI_FILESTAT_SET_ATIM | WASI_FILESTAT_SET_ATIM_NOW;
if ((fstflags & atimflags) === atimflags) {
return WASI_EINVAL;
}
const mtimflags = WASI_FILESTAT_SET_MTIM | WASI_FILESTAT_SET_MTIM_NOW;
if ((fstflags & mtimflags) === mtimflags) {
return WASI_EINVAL;
}
if ((fstflags & WASI_FILESTAT_SET_ATIM) === WASI_FILESTAT_SET_ATIM) {
atim = nsToMs(stAtim);
} else if (
(fstflags & WASI_FILESTAT_SET_ATIM_NOW) ===
WASI_FILESTAT_SET_ATIM_NOW
) {
atim = n;
}
if ((fstflags & WASI_FILESTAT_SET_MTIM) === WASI_FILESTAT_SET_MTIM) {
mtim = nsToMs(stMtim);
} else if (
(fstflags & WASI_FILESTAT_SET_MTIM_NOW) ===
WASI_FILESTAT_SET_MTIM_NOW
) {
mtim = n;
}
fs.futimesSync(stats.real, new Date(atim), new Date(mtim));
return WASI_ESUCCESS;
}
),
fd_prestat_get: wrap((fd: number, bufPtr: number) => {
const stats = CHECK_FD(fd, BigInt(0));
// log("fd_prestat_get", { fd, stats });
this.refreshMemory();
this.view.setUint8(bufPtr, WASI_PREOPENTYPE_DIR);
this.view.setUint32(
bufPtr + 4,
// TODO: this is definitely completely wrong unless preopens=/.
// NOTE: when both paths are blank, we return "". This is used by
// cPython on sockets. It used to raise an error here.
Buffer.byteLength(stats.fakePath ?? stats.path ?? ""),
true
);
return WASI_ESUCCESS;
}),
fd_prestat_dir_name: wrap(
(fd: number, pathPtr: number, pathLen: number) => {
const stats = CHECK_FD(fd, BigInt(0));
this.refreshMemory();
// NOTE: when both paths are blank, we return "". This is used by
// cPython on sockets. It used to raise an error here.
Buffer.from(this.memory.buffer).write(
stats.fakePath ?? stats.path ?? "" /* TODO: wrong in general!? */,
pathPtr,
pathLen,
"utf8"
);
return WASI_ESUCCESS;
}
),
fd_pwrite: wrap(
(
fd: number,
iovs: number,
iovsLen: number,
offset: number,
nwritten: number
) => {
const stats = CHECK_FD(fd, WASI_RIGHT_FD_WRITE | WASI_RIGHT_FD_SEEK);
let written = 0;
getiovs(iovs, iovsLen).forEach((iov) => {
let w = 0;
while (w < iov.byteLength) {
w += fs.writeSync(
stats.real,
iov,
w,
iov.byteLength - w,
Number(offset) + written + w
);
}
written += w;
});
this.view.setUint32(nwritten, written, true);
return WASI_ESUCCESS;
}
),
fd_write: wrap(
(fd: number, iovs: number, iovsLen: number, nwritten: number) => {
const stats = CHECK_FD(fd, WASI_RIGHT_FD_WRITE);
const IS_STDOUT = fd == WASI_STDOUT_FILENO;
const IS_STDERR = fd == WASI_STDERR_FILENO;
let written = 0;
getiovs(iovs, iovsLen).forEach((iov) => {
//console.log("fd_write", `"${new TextDecoder().decode(iov)}"`);
if (iov.byteLength == 0) return;
// log(
// `writing to fd=${fd}: `,
// JSON.stringify(new TextDecoder().decode(iov)),
// JSON.stringify(iov)
// );
if (IS_STDOUT && this.sendStdout != null) {
this.sendStdout(iov);
written += iov.byteLength;
} else if (IS_STDERR && this.sendStderr != null) {
this.sendStderr(iov);
written += iov.byteLength;
} else {
// useful to be absolutely sure if wasi is writing something:
// log(`write "${new TextDecoder().decode(iov)}" to ${fd})`);
let w = 0;
while (w < iov.byteLength) {
// log(`write ${iov.byteLength} bytes to fd=${stats.real}`);
const i = fs.writeSync(
stats.real,
iov,
w,
iov.byteLength - w,
stats.offset ? Number(stats.offset) : null
);
// log(`just wrote i=${i} bytes`);
if (stats.offset) stats.offset += BigInt(i);
w += i;
}
//console.log("fd_write", fd, " wrote ", w);
written += w;
}
});
this.view.setUint32(nwritten, written, true);
return WASI_ESUCCESS;
}
),
fd_pread: wrap(
(
fd: number,
iovs: number,
iovsLen: number,
offset: number,
nread: number
) => {
const stats = CHECK_FD(fd, WASI_RIGHT_FD_READ | WASI_RIGHT_FD_SEEK);
let read = 0;
outer: for (const iov of getiovs(iovs, iovsLen)) {
let r = 0;
while (r < iov.byteLength) {
const length = iov.byteLength - r;
const rr = fs.readSync(
stats.real,
iov,
r,
iov.byteLength - r,
Number(offset) + read + r
);
r += rr;
read += rr;
// If we don't read anything, or we receive less than requested
if (rr === 0 || rr < length) {
break outer;
}
}
read += r;
}
this.view.setUint32(nread, read, true);
return WASI_ESUCCESS;
}
),
fd_read: wrap(
(fd: number, iovs: number, iovsLen: number, nread: number) => {
const stats = CHECK_FD(fd, WASI_RIGHT_FD_READ);
const IS_STDIN = fd == WASI_STDIN_FILENO;
let read = 0;
// logToFile(
// `fd_read: ${IS_STDIN}, ${JSON.stringify(stats, (_, value) =>
// typeof value === "bigint" ? value.toString() : value
// )}, ${this.stdinBuffer?.length} ${this.stdinBuffer?.toString()}`
// );
// console.log("fd_read", fd, stats, IS_STDIN, this.getStdin != null);
outer: for (const iov of getiovs(iovs, iovsLen)) {
let r = 0;
while (r < iov.byteLength) {
let length = iov.byteLength - r;
let position =
IS_STDIN || stats.offset === undefined
? null
: Number(stats.offset);
let rr = 0;
if (IS_STDIN) {
if (this.getStdin != null) {
if (this.stdinBuffer == null) {
this.stdinBuffer = this.getStdin();
}
if (this.stdinBuffer != null) {
// just got stdin after waiting for it in poll_oneoff
// TODO: Do we need to limit length or iov will overflow?
// Or will the below just work fine? It might.
// Second remark -- we do not do anything special here to try to
// handle seeing EOF (ctrl+d) in the stream. No matter what I try,
// doing something here (e.g., returning 0 bytes read) doesn't
// properly work with libedit. So we leave it alone and let
// our slightly patched libedit handle control+d.
// In particular note to self -- **handling of control+d is done in libedit!**
rr = this.stdinBuffer.copy(iov);
if (rr == this.stdinBuffer.length) {
this.stdinBuffer = undefined;
} else {
this.stdinBuffer = this.stdinBuffer.slice(rr);
}
if (rr > 0) {
// we read from stdin.
this.lastStdin = new Date().valueOf();
}
}
} else {
// WARNING: might have to do something that burns 100% cpu... :-(
// though this is useful for debugging situations.
if (this.sleep == null && !warnedAboutSleep) {
warnedAboutSleep = true;
console.log(
"(cpu waiting for stdin: please define a way to sleep!) "
);
}
//while (rr == 0) {
try {
rr = fs.readSync(
stats.real, // fd
iov, // buffer
r, // offset
length, // length
position // position
);
} catch (_err) {}
if (rr == 0) {
this.shortPause();
} else {
this.lastStdin = new Date().valueOf();
}
//}
}
} else {
rr = fs.readSync(
stats.real, // fd
iov, // buffer
r, // offset
length, // length
position // position
);
}
// TODO: I'm not sure which type of files should have an offset yet.
// E.g., obviously a regular file should and obviously stdin (a character
// device) and a pipe (which has type WASI_FILETYPE_SOCKET_STREAM) does not.
if (stats.filetype == WASI_FILETYPE_REGULAR_FILE) {
stats.offset =
(stats.offset ? stats.offset : BigInt(0)) + BigInt(rr);
}
r += rr;
read += rr;
// If we don't read anything, or we receive less than requested
if (rr === 0 || rr < length) {
break outer;
}
}
}
// console.log("fd_read: nread=", read);
this.view.setUint32(nread, read, true);
return WASI_ESUCCESS;
}
),