src/library_wasi.js - external/github.com/emscripten-core/emscripten - Git at Google

 /**
  * @license
  * Copyright 2019 The Emscripten Authors
  * SPDX-License-Identifier: MIT
  */

 var WasiLibrary = {
 #if !MINIMAL_RUNTIME
   $ExitStatus__docs: '/** @constructor */',
   $ExitStatus: function(status) {
     this.name = 'ExitStatus';
     this.message = `Program terminated with exit(${status})`;
     this.status = status;
   },
   proc_exit__deps: ['$ExitStatus'],
 #endif

   proc_exit__nothrow: true,
   proc_exit: (code) => {
 #if MINIMAL_RUNTIME
     throw `exit(${code})`;
 #else
 #if RUNTIME_DEBUG
     dbg(`proc_exit: ${code}`);
 #endif
     EXITSTATUS = code;
     if (!keepRuntimeAlive()) {
       var doneExit = () => {
 #if expectToReceiveOnModule('onExit')
         if (Module['onExit']) Module['onExit'](code);
 #endif
         ABORT = true;
       }
 #if PTHREADS
       PThread.terminateAllThreads().then(doneExit);
 #else
       doneExit();
 #endif
     }
     quit_(code, new ExitStatus(code));
 #endif // MINIMAL_RUNTIME
   },

   sched_yield__nothrow: true,
   sched_yield: () => {
     return 0;
   },

   random_get__deps: ['getentropy'],
   random_get: (buf, buf_len) => {
     _getentropy(buf, buf_len);
     return 0;
   },

   $getEnvStrings__deps: ['$ENV', '$getExecutableName'],
   $getEnvStrings: () => {
     if (!getEnvStrings.strings) {
       // Default values.
 #if !DETERMINISTIC
       // Browser language detection #8751
       var lang = ((typeof navigator == 'object' && navigator.languages && navigator.languages[0]) || 'C').replace('-', '_') + '.UTF-8';
 #else
       // Deterministic language detection, ignore the browser's language.
       var lang = 'C.UTF-8';
 #endif
       var env = {
 #if !PURE_WASI
         'USER': 'web_user',
         'LOGNAME': 'web_user',
         'PATH': '/',
         'PWD': '/',
         'HOME': '/home/web_user',
         'LANG': lang,
         '_': getExecutableName()
 #endif
       };
       // Apply the user-provided values, if any.
       for (var x in ENV) {
         // x is a key in ENV; if ENV[x] is undefined, that means it was
         // explicitly set to be so. We allow user code to do that to
         // force variables with default values to remain unset.
         if (ENV[x] === undefined) delete env[x];
         else env[x] = ENV[x];
       }
       var strings = [];
       for (var x in env) {
         strings.push(`${x}=${env[x]}`);
       }
       getEnvStrings.strings = strings;
     }
     return getEnvStrings.strings;
   },

   environ_sizes_get__deps: ['$getEnvStrings'],
   environ_sizes_get__nothrow: true,
   environ_sizes_get: (penviron_count, penviron_buf_size) => {
     var strings = getEnvStrings();
     {{{ makeSetValue('penviron_count', 0, 'strings.length', SIZE_TYPE) }}};
     var bufSize = 0;
     strings.forEach(function(string) {
       bufSize += string.length + 1;
     });
     {{{ makeSetValue('penviron_buf_size', 0, 'bufSize', SIZE_TYPE) }}};
     return 0;
   },

   environ_get__deps: ['$getEnvStrings', '$stringToAscii'],
   environ_get__nothrow: true,
   environ_get: (__environ, environ_buf) => {
     var bufSize = 0;
     getEnvStrings().forEach(function(string, i) {
       var ptr = environ_buf + bufSize;
       {{{ makeSetValue('__environ', `i*${POINTER_SIZE}`, 'ptr', POINTER_TYPE) }}};
       stringToAscii(string, ptr);
       bufSize += string.length + 1;
     });
     return 0;
   },

   // In normal (non-standalone) mode arguments are passed direclty
   // to main, and the `mainArgs` global does not exist.
 #if STANDALONE_WASM
   args_sizes_get__nothrow: true,
   args_sizes_get: (pargc, pargv_buf_size) => {
 #if MAIN_READS_PARAMS
     {{{ makeSetValue('pargc', 0, 'mainArgs.length', SIZE_TYPE) }}};
     var bufSize = 0;
     mainArgs.forEach(function(arg) {
       bufSize += arg.length + 1;
     });
     {{{ makeSetValue('pargv_buf_size', 0, 'bufSize', SIZE_TYPE) }}};
 #else
     {{{ makeSetValue('pargc', 0, '0', SIZE_TYPE) }}};
 #endif
     return 0;
   },

   args_get__nothrow: true,
   args_get__deps: ['$stringToAscii'],
   args_get: (argv, argv_buf) => {
 #if MAIN_READS_PARAMS
     var bufSize = 0;
     mainArgs.forEach(function(arg, i) {
       var ptr = argv_buf + bufSize;
       {{{ makeSetValue('argv', `i*${POINTER_SIZE}`, 'ptr', POINTER_TYPE) }}};
       stringToAscii(arg, ptr);
       bufSize += arg.length + 1;
     });
 #endif
     return 0;
   },
 #endif

   $checkWasiClock: (clock_id) => {
     return clock_id == {{{ cDefs.__WASI_CLOCKID_REALTIME }}} ||
            clock_id == {{{ cDefs.__WASI_CLOCKID_MONOTONIC }}} ||
            clock_id == {{{ cDefs.__WASI_CLOCKID_PROCESS_CPUTIME_ID }}} ||
            clock_id == {{{ cDefs.__WASI_CLOCKID_THREAD_CPUTIME_ID }}};
   },

   // TODO: the i64 in the API here must be legalized for this JS code to run,
   // but the wasm file can't be legalized in standalone mode, which is where
   // this is needed. To get this code to be usable as a JS shim we need to
   // either wait for BigInt support or to legalize on the client.
   clock_time_get__i53abi: true,
   clock_time_get__nothrow: true,
   clock_time_get__deps: ['emscripten_get_now', '$nowIsMonotonic', '$checkWasiClock'],
   clock_time_get: (clk_id, ignored_precision, ptime) => {
     if (!checkWasiClock(clk_id)) {
       return {{{ cDefs.EINVAL }}};
     }
     var now;
     // all wasi clocks but realtime are monotonic
     if (clk_id === {{{ cDefs.__WASI_CLOCKID_REALTIME }}}) {
       now = Date.now();
     } else if (nowIsMonotonic) {
       now = _emscripten_get_now();
     } else {
       return {{{ cDefs.ENOSYS }}};
     }
     // "now" is in ms, and wasi times are in ns.
     var nsec = Math.round(now * 1000 * 1000);
     {{{ makeSetValue('ptime', 0, 'nsec >>> 0', 'i32') }}};
     {{{ makeSetValue('ptime', 4, '(nsec / Math.pow(2, 32)) >>> 0', 'i32') }}};
     return 0;
   },

   clock_res_get__nothrow: true,
   clock_res_get__deps: ['emscripten_get_now', 'emscripten_get_now_res', '$nowIsMonotonic', '$checkWasiClock'],
   clock_res_get: (clk_id, pres) => {
     if (!checkWasiClock(clk_id)) {
       return {{{ cDefs.EINVAL }}};
     }
     var nsec;
     // all wasi clocks but realtime are monotonic
     if (clk_id === {{{ cDefs.CLOCK_REALTIME }}}) {
       nsec = 1000 * 1000; // educated guess that it's milliseconds
     } else if (nowIsMonotonic) {
       nsec = _emscripten_get_now_res();
     } else {
       return {{{ cDefs.ENOSYS }}};
     }
     {{{ makeSetValue('pres', 0, 'nsec >>> 0', 'i32') }}};
     {{{ makeSetValue('pres', 4, '(nsec / Math.pow(2, 32)) >>> 0', 'i32') }}};
     return 0;
   },

 #if SYSCALLS_REQUIRE_FILESYSTEM
   $doReadv__docs: '/** @param {number=} offset */',
   $doReadv: (stream, iov, iovcnt, offset) => {
     var ret = 0;
     for (var i = 0; i < iovcnt; i++) {
       var ptr = {{{ makeGetValue('iov', C_STRUCTS.iovec.iov_base, '*') }}};
       var len = {{{ makeGetValue('iov', C_STRUCTS.iovec.iov_len, '*') }}};
       iov += {{{ C_STRUCTS.iovec.__size__ }}};
       var curr = FS.read(stream, {{{ heapAndOffset('HEAP8', 'ptr') }}}, len, offset);
       if (curr < 0) return -1;
       ret += curr;
       if (curr < len) break; // nothing more to read
       if (typeof offset !== 'undefined') {
         offset += curr;
       }
     }
     return ret;
   },
   $doWritev__docs: '/** @param {number=} offset */',
   $doWritev: (stream, iov, iovcnt, offset) => {
     var ret = 0;
     for (var i = 0; i < iovcnt; i++) {
       var ptr = {{{ makeGetValue('iov', C_STRUCTS.iovec.iov_base, '*') }}};
       var len = {{{ makeGetValue('iov', C_STRUCTS.iovec.iov_len, '*') }}};
       iov += {{{ C_STRUCTS.iovec.__size__ }}};
       var curr = FS.write(stream, {{{ heapAndOffset('HEAP8', 'ptr') }}}, len, offset);
       if (curr < 0) return -1;
       ret += curr;
       if (typeof offset !== 'undefined') {
         offset += curr;
       }
     }
     return ret;
   },
 #else
   // MEMFS filesystem disabled lite handling of stdout and stderr:
   $printCharBuffers: [null, [], []], // 1 => stdout, 2 => stderr
   $printCharBuffers__internal: true,
   $printChar__internal: true,
   $printChar__deps: ['$printCharBuffers', '$UTF8ArrayToString'],
   $printChar: (stream, curr) => {
     var buffer = printCharBuffers[stream];
 #if ASSERTIONS
     assert(buffer);
 #endif
     if (curr === 0 || curr === {{{ charCode('\n') }}}) {
       (stream === 1 ? out : err)(UTF8ArrayToString(buffer, 0));
       buffer.length = 0;
     } else {
       buffer.push(curr);
     }
   },
 #endif // SYSCALLS_REQUIRE_FILESYSTEM

 #if SYSCALLS_REQUIRE_FILESYSTEM
   fd_write__deps: ['$doWritev'],
 #elif (!MINIMAL_RUNTIME || EXIT_RUNTIME)
   $flush_NO_FILESYSTEM__deps: ['$printChar', '$printCharBuffers'],
   $flush_NO_FILESYSTEM: () => {
     // flush anything remaining in the buffers during shutdown
 #if hasExportedSymbol('fflush')
     _fflush(0);
 #endif
     if (printCharBuffers[1].length) printChar(1, {{{ charCode("\n") }}});
     if (printCharBuffers[2].length) printChar(2, {{{ charCode("\n") }}});
   },
   fd_write__deps: ['$flush_NO_FILESYSTEM', '$printChar'],
   fd_write__postset: () => {
     addAtExit('flush_NO_FILESYSTEM()');
   },
 #else
   fd_write__deps: ['$printChar'],
 #endif
   fd_write: (fd, iov, iovcnt, pnum) => {
 #if SYSCALLS_REQUIRE_FILESYSTEM
     var stream = SYSCALLS.getStreamFromFD(fd);
     var num = doWritev(stream, iov, iovcnt);
 #else
     // hack to support printf in SYSCALLS_REQUIRE_FILESYSTEM=0
     var num = 0;
     for (var i = 0; i < iovcnt; i++) {
       var ptr = {{{ makeGetValue('iov', C_STRUCTS.iovec.iov_base, '*') }}};
       var len = {{{ makeGetValue('iov', C_STRUCTS.iovec.iov_len, '*') }}};
       iov += {{{ C_STRUCTS.iovec.__size__ }}};
       for (var j = 0; j < len; j++) {
         printChar(fd, HEAPU8[ptr+j]);
       }
       num += len;
     }
 #endif // SYSCALLS_REQUIRE_FILESYSTEM
     {{{ makeSetValue('pnum', 0, 'num', SIZE_TYPE) }}};
     return 0;
   },

 #if SYSCALLS_REQUIRE_FILESYSTEM
   fd_pwrite__deps: ['$doWritev'],
 #endif
   fd_pwrite__i53abi: true,
   fd_pwrite: (fd, iov, iovcnt, offset, pnum) => {
 #if SYSCALLS_REQUIRE_FILESYSTEM
     if (isNaN(offset)) return {{{ cDefs.EOVERFLOW }}};
     var stream = SYSCALLS.getStreamFromFD(fd)
     var num = doWritev(stream, iov, iovcnt, offset);
     {{{ makeSetValue('pnum', 0, 'num', SIZE_TYPE) }}};
     return 0;
 #elif ASSERTIONS
     abort('fd_pwrite called without SYSCALLS_REQUIRE_FILESYSTEM');
 #else
     return {{{ cDefs.ENOSYS }}};
 #endif
   },

   fd_close: (fd) => {
 #if SYSCALLS_REQUIRE_FILESYSTEM
     var stream = SYSCALLS.getStreamFromFD(fd);
     FS.close(stream);
     return 0;
 #elif PROXY_POSIX_SOCKETS
     // close() is a tricky function because it can be used to close both regular file descriptors
     // and POSIX network socket handles, hence an implementation would need to track for each
     // file descriptor which kind of item it is. To simplify, when using PROXY_POSIX_SOCKETS
     // option, use shutdown() to close a socket, and this function should behave like a no-op.
     warnOnce('To close sockets with PROXY_POSIX_SOCKETS bridge, prefer to use the function shutdown() that is proxied, instead of close()')
     return 0;
 #elif ASSERTIONS
     abort('fd_close called without SYSCALLS_REQUIRE_FILESYSTEM');
 #else
     return {{{ cDefs.ENOSYS }}};
 #endif // SYSCALLS_REQUIRE_FILESYSTEM
   },

 #if SYSCALLS_REQUIRE_FILESYSTEM
   fd_read__deps: ['$doReadv'],
 #endif
   fd_read: (fd, iov, iovcnt, pnum) => {
 #if SYSCALLS_REQUIRE_FILESYSTEM
     var stream = SYSCALLS.getStreamFromFD(fd);
     var num = doReadv(stream, iov, iovcnt);
     {{{ makeSetValue('pnum', 0, 'num', SIZE_TYPE) }}};
     return 0;
 #elif ASSERTIONS
     abort('fd_read called without SYSCALLS_REQUIRE_FILESYSTEM');
 #else
     return {{{ cDefs.ENOSYS }}};
 #endif // SYSCALLS_REQUIRE_FILESYSTEM
   },

 #if SYSCALLS_REQUIRE_FILESYSTEM
   fd_pread__deps: ['$doReadv'],
 #endif
   fd_pread__i53abi: true,
   fd_pread: (fd, iov, iovcnt, offset, pnum) => {
 #if SYSCALLS_REQUIRE_FILESYSTEM
     if (isNaN(offset)) return {{{ cDefs.EOVERFLOW }}};
     var stream = SYSCALLS.getStreamFromFD(fd)
     var num = doReadv(stream, iov, iovcnt, offset);
     {{{ makeSetValue('pnum', 0, 'num', SIZE_TYPE) }}};
     return 0;
 #elif ASSERTIONS
     abort('fd_pread called without SYSCALLS_REQUIRE_FILESYSTEM');
 #else
     return {{{ cDefs.ENOSYS }}};
 #endif
   },

   fd_seek__i53abi: true,
   fd_seek: (fd, offset, whence, newOffset) => {
 #if SYSCALLS_REQUIRE_FILESYSTEM
     if (isNaN(offset)) return {{{ cDefs.EOVERFLOW }}};
     var stream = SYSCALLS.getStreamFromFD(fd);
     FS.llseek(stream, offset, whence);
     {{{ makeSetValue('newOffset', '0', 'stream.position', 'i64') }}};
     if (stream.getdents && offset === 0 && whence === {{{ cDefs.SEEK_SET }}}) stream.getdents = null; // reset readdir state
     return 0;
 #else
     return {{{ cDefs.ESPIPE }}};
 #endif
   },

   $wasiRightsToMuslOFlags: (rights) => {
 #if SYSCALL_DEBUG
     dbg(`wasiRightsToMuslOFlags: ${rights}`);
 #endif
     if ((rights & {{{ cDefs.__WASI_RIGHTS_FD_READ }}}) && (rights & {{{ cDefs.__WASI_RIGHTS_FD_WRITE }}})) {
       return {{{ cDefs.O_RDWR }}};
     }
     if (rights & {{{ cDefs.__WASI_RIGHTS_FD_READ }}}) {
       return {{{ cDefs.O_RDONLY }}};
     }
     if (rights & {{{ cDefs.__WASI_RIGHTS_FD_WRITE }}}) {
       return {{{ cDefs.O_WRONLY }}};
     }
     throw new FS.ErrnoError({{{ cDefs.EINVAL }}});
   },

   $wasiOFlagsToMuslOFlags: (oflags) => {
     var musl_oflags = 0;
     if (oflags & {{{ cDefs.__WASI_OFLAGS_CREAT }}}) {
       musl_oflags |= {{{ cDefs.O_CREAT }}};
     }
     if (oflags & {{{ cDefs.__WASI_OFLAGS_TRUNC }}}) {
       musl_oflags |= {{{ cDefs.O_TRUNC }}};
     }
     if (oflags & {{{ cDefs.__WASI_OFLAGS_DIRECTORY }}}) {
       musl_oflags |= {{{ cDefs.O_DIRECTORY }}};
     }
     if (oflags & {{{ cDefs.__WASI_OFLAGS_EXCL }}}) {
       musl_oflags |= {{{ cDefs.O_EXCL }}};
     }
     return musl_oflags;
   },

 #if PURE_WASI
   // preopen maps open file descriptors to pathname.
   // In emscripten we already have a VFS layer so (for now) we expose the entire
   // VFS to the wasi API.
   $preopens: "{3: '/'}",

   path_open__sig: 'iiiiiiiiii',
   path_open__deps: ['$wasiRightsToMuslOFlags', '$wasiOFlagsToMuslOFlags', '$preopens'],
   path_open: (fd, dirflags, path, path_len, oflags,
               fs_rights_base, fs_rights_inherting,
               fdflags, opened_fd) => {
     if (!(fd in preopens)) {
       return {{{ cDefs.EBADF }}};
     }
     var pathname = UTF8ToString(path, path_len);
     var musl_oflags = wasiRightsToMuslOFlags(Number(fs_rights_base));
 #if SYSCALL_DEBUG
     dbg(`oflags1: ${ptrToString(musl_oflags)}`);
 #endif
     musl_oflags |= wasiOFlagsToMuslOFlags(Number(oflags));
 #if SYSCALL_DEBUG
     dbg(`oflags2: ${ptrToString(musl_oflags)}`);
 #endif
     var stream = FS.open(pathname, musl_oflags);
     {{{ makeSetValue('opened_fd', '0', 'stream.fd', 'i32') }}};
     return 0;
   },

   fd_prestat_dir_name__deps: ['$preopens'],
   fd_prestat_dir_name__sig: 'iiii',
   fd_prestat_dir_name__nothrow: true,
   fd_prestat_dir_name: (fd, path, path_len) => {
     if (!(fd in preopens)) {
       return {{{ cDefs.EBADF }}};
     }
     var preopen_path = preopens[fd];
     stringToUTF8Array(preopen_path, HEAP8, path, path_len)
 #if SYSCALL_DEBUG
     dbg(`fd_prestat_dir_name -> "${preopen_path}"`);
 #endif
     return 0;
   },

   fd_prestat_get__deps: ['$preopens'],
   fd_prestat_get__sig: 'iii',
   fd_prestat_get__nothrow: true,
   fd_prestat_get: (fd, stat_buf) => {
     if (!(fd in preopens)) {
       return {{{ cDefs.EBADF }}};
     }
     var preopen = preopens[fd];
     {{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_prestat_t.pr_type, cDefs.__WASI_PREOPENTYPE_DIR, 'i8') }}};
     {{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_prestat_t.u + C_STRUCTS.__wasi_prestat_dir_t.pr_name_len, 'preopen.length', 'i64') }}};
     return 0;
   },

   fd_fdstat_set_flags__sig: 'iii',
   fd_fdstat_set_flags: (fd, flags) => {
     // TODO(sbc): implement
     var stream = SYSCALLS.getStreamFromFD(fd);
     return 0;
   },

   fd_filestat_get__sig: 'iii',
   fd_filestat_get: (fd, stat_buf) => {
     // TODO(sbc): implement
     var stream = SYSCALLS.getStreamFromFD(fd);
     {{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.dev, '0', 'i64') }}};
     {{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.ino, '0', 'i64') }}};
     {{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.filetype, '0', 'i8') }}};
     {{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.nlink, '0', 'i64') }}};
     {{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.size, '0', 'i64') }}};
     {{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.atim, '0', 'i64') }}};
     {{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.mtim, '0', 'i64') }}};
     {{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.ctim, '0', 'i64') }}};
     return 0;
   },
 #endif

 #if PURE_WASI
   fd_fdstat_get__deps: ['$preopens'],
 #endif
   fd_fdstat_get: (fd, pbuf) => {
     var rightsBase = 0;
     var rightsInheriting = 0;
     var flags = 0;
 #if PURE_WASI
     if (fd in preopens) {
       var type = {{{ cDefs.__WASI_FILETYPE_DIRECTORY }}};
       rightsBase =  {{{ cDefs.__WASI_RIGHTS_PATH_CREATE_FILE |
                              cDefs.__WASI_RIGHTS_PATH_OPEN }}};
       rightsInheriting =  {{{ cDefs.__WASI_RIGHTS_FD_READ |
                                    cDefs.__WASI_RIGHTS_FD_WRITE }}}
     } else
 #endif
     {
 #if SYSCALLS_REQUIRE_FILESYSTEM
       var stream = SYSCALLS.getStreamFromFD(fd);
       // All character devices are terminals (other things a Linux system would
       // assume is a character device, like the mouse, we have special APIs for).
       var type = stream.tty ? {{{ cDefs.__WASI_FILETYPE_CHARACTER_DEVICE }}} :
                  FS.isDir(stream.mode) ? {{{ cDefs.__WASI_FILETYPE_DIRECTORY }}} :
                  FS.isLink(stream.mode) ? {{{ cDefs.__WASI_FILETYPE_SYMBOLIC_LINK }}} :
                  {{{ cDefs.__WASI_FILETYPE_REGULAR_FILE }}};
 #else
       // Hack to support printf in SYSCALLS_REQUIRE_FILESYSTEM=0. We support at
       // least stdin, stdout, stderr in a simple way.
 #if ASSERTIONS
       assert(fd == 0 || fd == 1 || fd == 2);
 #endif
       var type = {{{ cDefs.__WASI_FILETYPE_CHARACTER_DEVICE }}};
       if (fd == 0) {
         rightsBase = {{{ cDefs.__WASI_RIGHTS_FD_READ }}};
       } else if (fd == 1 || fd == 2) {
         rightsBase = {{{ cDefs.__WASI_RIGHTS_FD_WRITE }}};
       }
       flags = {{{ cDefs.__WASI_FDFLAGS_APPEND }}};
 #endif
     }
     {{{ makeSetValue('pbuf', C_STRUCTS.__wasi_fdstat_t.fs_filetype, 'type', 'i8') }}};
     {{{ makeSetValue('pbuf', C_STRUCTS.__wasi_fdstat_t.fs_flags, 'flags', 'i16') }}};
     {{{ makeSetValue('pbuf', C_STRUCTS.__wasi_fdstat_t.fs_rights_base, 'rightsBase', 'i64') }}};
     {{{ makeSetValue('pbuf', C_STRUCTS.__wasi_fdstat_t.fs_rights_inheriting, 'rightsInheriting', 'i64') }}};
     return 0;
   },

   fd_sync: (fd) => {
 #if SYSCALLS_REQUIRE_FILESYSTEM
     var stream = SYSCALLS.getStreamFromFD(fd);
 #if ASYNCIFY
     return Asyncify.handleSleep(function(wakeUp) {
       var mount = stream.node.mount;
       if (!mount.type.syncfs) {
         // We write directly to the file system, so there's nothing to do here.
         wakeUp(0);
         return;
       }
       mount.type.syncfs(mount, false, function(err) {
         if (err) {
           wakeUp(function() { return {{{ cDefs.EIO }}} });
           return;
         }
         wakeUp(0);
       });
     });
 #else
     if (stream.stream_ops && stream.stream_ops.fsync) {
       return stream.stream_ops.fsync(stream);
     }
     return 0; // we can't do anything synchronously; the in-memory FS is already synced to
 #endif // ASYNCIFY
 #elif ASSERTIONS
     abort('fd_sync called without SYSCALLS_REQUIRE_FILESYSTEM');
 #else
     return {{{ cDefs.ENOSYS }}};
 #endif // SYSCALLS_REQUIRE_FILESYSTEM
   },
 };

 for (var x in WasiLibrary) {
   wrapSyscallFunction(x, WasiLibrary, true);
 }

 mergeInto(LibraryManager.library, WasiLibrary);
	/**
	* @license
	* Copyright 2019 The Emscripten Authors
	* SPDX-License-Identifier: MIT
	*/

	var WasiLibrary = {
	#if !MINIMAL_RUNTIME
	$ExitStatus__docs: '/** @constructor */',
	$ExitStatus: function(status) {
	this.name = 'ExitStatus';
	this.message = `Program terminated with exit(${status})`;
	this.status = status;
	},
	proc_exit__deps: ['$ExitStatus'],
	#endif

	proc_exit__nothrow: true,
	proc_exit: (code) => {
	#if MINIMAL_RUNTIME
	throw `exit(${code})`;
	#else
	#if RUNTIME_DEBUG
	dbg(`proc_exit: ${code}`);
	#endif
	EXITSTATUS = code;
	if (!keepRuntimeAlive()) {
	var doneExit = () => {
	#if expectToReceiveOnModule('onExit')
	if (Module['onExit']) Module['onExit'](code);
	#endif
	ABORT = true;
	}
	#if PTHREADS
	PThread.terminateAllThreads().then(doneExit);
	#else
	doneExit();
	#endif
	}
	quit_(code, new ExitStatus(code));
	#endif // MINIMAL_RUNTIME
	},

	sched_yield__nothrow: true,
	sched_yield: () => {
	return 0;
	},

	random_get__deps: ['getentropy'],
	random_get: (buf, buf_len) => {
	_getentropy(buf, buf_len);
	return 0;
	},

	$getEnvStrings__deps: ['$ENV', '$getExecutableName'],
	$getEnvStrings: () => {
	if (!getEnvStrings.strings) {
	// Default values.
	#if !DETERMINISTIC
	// Browser language detection #8751
	var lang = ((typeof navigator == 'object' && navigator.languages && navigator.languages[0]) \|\| 'C').replace('-', '_') + '.UTF-8';
	#else
	// Deterministic language detection, ignore the browser's language.
	var lang = 'C.UTF-8';
	#endif
	var env = {
	#if !PURE_WASI
	'USER': 'web_user',
	'LOGNAME': 'web_user',
	'PATH': '/',
	'PWD': '/',
	'HOME': '/home/web_user',
	'LANG': lang,
	'_': getExecutableName()
	#endif
	};
	// Apply the user-provided values, if any.
	for (var x in ENV) {
	// x is a key in ENV; if ENV[x] is undefined, that means it was
	// explicitly set to be so. We allow user code to do that to
	// force variables with default values to remain unset.
	if (ENV[x] === undefined) delete env[x];
	else env[x] = ENV[x];
	}
	var strings = [];
	for (var x in env) {
	strings.push(`${x}=${env[x]}`);
	}
	getEnvStrings.strings = strings;
	}
	return getEnvStrings.strings;
	},

	environ_sizes_get__deps: ['$getEnvStrings'],
	environ_sizes_get__nothrow: true,
	environ_sizes_get: (penviron_count, penviron_buf_size) => {
	var strings = getEnvStrings();
	{{{ makeSetValue('penviron_count', 0, 'strings.length', SIZE_TYPE) }}};
	var bufSize = 0;
	strings.forEach(function(string) {
	bufSize += string.length + 1;
	});
	{{{ makeSetValue('penviron_buf_size', 0, 'bufSize', SIZE_TYPE) }}};
	return 0;
	},

	environ_get__deps: ['$getEnvStrings', '$stringToAscii'],
	environ_get__nothrow: true,
	environ_get: (__environ, environ_buf) => {
	var bufSize = 0;
	getEnvStrings().forEach(function(string, i) {
	var ptr = environ_buf + bufSize;
	{{{ makeSetValue('__environ', `i*${POINTER_SIZE}`, 'ptr', POINTER_TYPE) }}};
	stringToAscii(string, ptr);
	bufSize += string.length + 1;
	});
	return 0;
	},

	// In normal (non-standalone) mode arguments are passed direclty
	// to main, and the `mainArgs` global does not exist.
	#if STANDALONE_WASM
	args_sizes_get__nothrow: true,
	args_sizes_get: (pargc, pargv_buf_size) => {
	#if MAIN_READS_PARAMS
	{{{ makeSetValue('pargc', 0, 'mainArgs.length', SIZE_TYPE) }}};
	var bufSize = 0;
	mainArgs.forEach(function(arg) {
	bufSize += arg.length + 1;
	});
	{{{ makeSetValue('pargv_buf_size', 0, 'bufSize', SIZE_TYPE) }}};
	#else
	{{{ makeSetValue('pargc', 0, '0', SIZE_TYPE) }}};
	#endif
	return 0;
	},

	args_get__nothrow: true,
	args_get__deps: ['$stringToAscii'],
	args_get: (argv, argv_buf) => {
	#if MAIN_READS_PARAMS
	var bufSize = 0;
	mainArgs.forEach(function(arg, i) {
	var ptr = argv_buf + bufSize;
	{{{ makeSetValue('argv', `i*${POINTER_SIZE}`, 'ptr', POINTER_TYPE) }}};
	stringToAscii(arg, ptr);
	bufSize += arg.length + 1;
	});
	#endif
	return 0;
	},
	#endif

	$checkWasiClock: (clock_id) => {
	return clock_id == {{{ cDefs.__WASI_CLOCKID_REALTIME }}} \|\|
	clock_id == {{{ cDefs.__WASI_CLOCKID_MONOTONIC }}} \|\|
	clock_id == {{{ cDefs.__WASI_CLOCKID_PROCESS_CPUTIME_ID }}} \|\|
	clock_id == {{{ cDefs.__WASI_CLOCKID_THREAD_CPUTIME_ID }}};
	},

	// TODO: the i64 in the API here must be legalized for this JS code to run,
	// but the wasm file can't be legalized in standalone mode, which is where
	// this is needed. To get this code to be usable as a JS shim we need to
	// either wait for BigInt support or to legalize on the client.
	clock_time_get__i53abi: true,
	clock_time_get__nothrow: true,
	clock_time_get__deps: ['emscripten_get_now', '$nowIsMonotonic', '$checkWasiClock'],
	clock_time_get: (clk_id, ignored_precision, ptime) => {
	if (!checkWasiClock(clk_id)) {
	return {{{ cDefs.EINVAL }}};
	}
	var now;
	// all wasi clocks but realtime are monotonic
	if (clk_id === {{{ cDefs.__WASI_CLOCKID_REALTIME }}}) {
	now = Date.now();
	} else if (nowIsMonotonic) {
	now = _emscripten_get_now();
	} else {
	return {{{ cDefs.ENOSYS }}};
	}
	// "now" is in ms, and wasi times are in ns.
	var nsec = Math.round(now * 1000 * 1000);
	{{{ makeSetValue('ptime', 0, 'nsec >>> 0', 'i32') }}};
	{{{ makeSetValue('ptime', 4, '(nsec / Math.pow(2, 32)) >>> 0', 'i32') }}};
	return 0;
	},

	clock_res_get__nothrow: true,
	clock_res_get__deps: ['emscripten_get_now', 'emscripten_get_now_res', '$nowIsMonotonic', '$checkWasiClock'],
	clock_res_get: (clk_id, pres) => {
	if (!checkWasiClock(clk_id)) {
	return {{{ cDefs.EINVAL }}};
	}
	var nsec;
	// all wasi clocks but realtime are monotonic
	if (clk_id === {{{ cDefs.CLOCK_REALTIME }}}) {
	nsec = 1000 * 1000; // educated guess that it's milliseconds
	} else if (nowIsMonotonic) {
	nsec = _emscripten_get_now_res();
	} else {
	return {{{ cDefs.ENOSYS }}};
	}
	{{{ makeSetValue('pres', 0, 'nsec >>> 0', 'i32') }}};
	{{{ makeSetValue('pres', 4, '(nsec / Math.pow(2, 32)) >>> 0', 'i32') }}};
	return 0;
	},

	#if SYSCALLS_REQUIRE_FILESYSTEM
	$doReadv__docs: '/** @param {number=} offset */',
	$doReadv: (stream, iov, iovcnt, offset) => {
	var ret = 0;
	for (var i = 0; i < iovcnt; i++) {
	var ptr = {{{ makeGetValue('iov', C_STRUCTS.iovec.iov_base, '*') }}};
	var len = {{{ makeGetValue('iov', C_STRUCTS.iovec.iov_len, '*') }}};
	iov += {{{ C_STRUCTS.iovec.__size__ }}};
	var curr = FS.read(stream, {{{ heapAndOffset('HEAP8', 'ptr') }}}, len, offset);
	if (curr < 0) return -1;
	ret += curr;
	if (curr < len) break; // nothing more to read
	if (typeof offset !== 'undefined') {
	offset += curr;
	}
	}
	return ret;
	},
	$doWritev__docs: '/** @param {number=} offset */',
	$doWritev: (stream, iov, iovcnt, offset) => {
	var ret = 0;
	for (var i = 0; i < iovcnt; i++) {
	var ptr = {{{ makeGetValue('iov', C_STRUCTS.iovec.iov_base, '*') }}};
	var len = {{{ makeGetValue('iov', C_STRUCTS.iovec.iov_len, '*') }}};
	iov += {{{ C_STRUCTS.iovec.__size__ }}};
	var curr = FS.write(stream, {{{ heapAndOffset('HEAP8', 'ptr') }}}, len, offset);
	if (curr < 0) return -1;
	ret += curr;
	if (typeof offset !== 'undefined') {
	offset += curr;
	}
	}
	return ret;
	},
	#else
	// MEMFS filesystem disabled lite handling of stdout and stderr:
	$printCharBuffers: [null, [], []], // 1 => stdout, 2 => stderr
	$printCharBuffers__internal: true,
	$printChar__internal: true,
	$printChar__deps: ['$printCharBuffers', '$UTF8ArrayToString'],
	$printChar: (stream, curr) => {
	var buffer = printCharBuffers[stream];
	#if ASSERTIONS
	assert(buffer);
	#endif
	if (curr === 0 \|\| curr === {{{ charCode('\n') }}}) {
	(stream === 1 ? out : err)(UTF8ArrayToString(buffer, 0));
	buffer.length = 0;
	} else {
	buffer.push(curr);
	}
	},
	#endif // SYSCALLS_REQUIRE_FILESYSTEM

	#if SYSCALLS_REQUIRE_FILESYSTEM
	fd_write__deps: ['$doWritev'],
	#elif (!MINIMAL_RUNTIME \|\| EXIT_RUNTIME)
	$flush_NO_FILESYSTEM__deps: ['$printChar', '$printCharBuffers'],
	$flush_NO_FILESYSTEM: () => {
	// flush anything remaining in the buffers during shutdown
	#if hasExportedSymbol('fflush')
	_fflush(0);
	#endif
	if (printCharBuffers[1].length) printChar(1, {{{ charCode("\n") }}});
	if (printCharBuffers[2].length) printChar(2, {{{ charCode("\n") }}});
	},
	fd_write__deps: ['$flush_NO_FILESYSTEM', '$printChar'],
	fd_write__postset: () => {
	addAtExit('flush_NO_FILESYSTEM()');
	},
	#else
	fd_write__deps: ['$printChar'],
	#endif
	fd_write: (fd, iov, iovcnt, pnum) => {
	#if SYSCALLS_REQUIRE_FILESYSTEM
	var stream = SYSCALLS.getStreamFromFD(fd);
	var num = doWritev(stream, iov, iovcnt);
	#else
	// hack to support printf in SYSCALLS_REQUIRE_FILESYSTEM=0
	var num = 0;
	for (var i = 0; i < iovcnt; i++) {
	var ptr = {{{ makeGetValue('iov', C_STRUCTS.iovec.iov_base, '*') }}};
	var len = {{{ makeGetValue('iov', C_STRUCTS.iovec.iov_len, '*') }}};
	iov += {{{ C_STRUCTS.iovec.__size__ }}};
	for (var j = 0; j < len; j++) {
	printChar(fd, HEAPU8[ptr+j]);
	}
	num += len;
	}
	#endif // SYSCALLS_REQUIRE_FILESYSTEM
	{{{ makeSetValue('pnum', 0, 'num', SIZE_TYPE) }}};
	return 0;
	},

	#if SYSCALLS_REQUIRE_FILESYSTEM
	fd_pwrite__deps: ['$doWritev'],
	#endif
	fd_pwrite__i53abi: true,
	fd_pwrite: (fd, iov, iovcnt, offset, pnum) => {
	#if SYSCALLS_REQUIRE_FILESYSTEM
	if (isNaN(offset)) return {{{ cDefs.EOVERFLOW }}};
	var stream = SYSCALLS.getStreamFromFD(fd)
	var num = doWritev(stream, iov, iovcnt, offset);
	{{{ makeSetValue('pnum', 0, 'num', SIZE_TYPE) }}};
	return 0;
	#elif ASSERTIONS
	abort('fd_pwrite called without SYSCALLS_REQUIRE_FILESYSTEM');
	#else
	return {{{ cDefs.ENOSYS }}};
	#endif
	},

	fd_close: (fd) => {
	#if SYSCALLS_REQUIRE_FILESYSTEM
	var stream = SYSCALLS.getStreamFromFD(fd);
	FS.close(stream);
	return 0;
	#elif PROXY_POSIX_SOCKETS
	// close() is a tricky function because it can be used to close both regular file descriptors
	// and POSIX network socket handles, hence an implementation would need to track for each
	// file descriptor which kind of item it is. To simplify, when using PROXY_POSIX_SOCKETS
	// option, use shutdown() to close a socket, and this function should behave like a no-op.
	warnOnce('To close sockets with PROXY_POSIX_SOCKETS bridge, prefer to use the function shutdown() that is proxied, instead of close()')
	return 0;
	#elif ASSERTIONS
	abort('fd_close called without SYSCALLS_REQUIRE_FILESYSTEM');
	#else
	return {{{ cDefs.ENOSYS }}};
	#endif // SYSCALLS_REQUIRE_FILESYSTEM
	},

	#if SYSCALLS_REQUIRE_FILESYSTEM
	fd_read__deps: ['$doReadv'],
	#endif
	fd_read: (fd, iov, iovcnt, pnum) => {
	#if SYSCALLS_REQUIRE_FILESYSTEM
	var stream = SYSCALLS.getStreamFromFD(fd);
	var num = doReadv(stream, iov, iovcnt);
	{{{ makeSetValue('pnum', 0, 'num', SIZE_TYPE) }}};
	return 0;
	#elif ASSERTIONS
	abort('fd_read called without SYSCALLS_REQUIRE_FILESYSTEM');
	#else
	return {{{ cDefs.ENOSYS }}};
	#endif // SYSCALLS_REQUIRE_FILESYSTEM
	},

	#if SYSCALLS_REQUIRE_FILESYSTEM
	fd_pread__deps: ['$doReadv'],
	#endif
	fd_pread__i53abi: true,
	fd_pread: (fd, iov, iovcnt, offset, pnum) => {
	#if SYSCALLS_REQUIRE_FILESYSTEM
	if (isNaN(offset)) return {{{ cDefs.EOVERFLOW }}};
	var stream = SYSCALLS.getStreamFromFD(fd)
	var num = doReadv(stream, iov, iovcnt, offset);
	{{{ makeSetValue('pnum', 0, 'num', SIZE_TYPE) }}};
	return 0;
	#elif ASSERTIONS
	abort('fd_pread called without SYSCALLS_REQUIRE_FILESYSTEM');
	#else
	return {{{ cDefs.ENOSYS }}};
	#endif
	},

	fd_seek__i53abi: true,
	fd_seek: (fd, offset, whence, newOffset) => {
	#if SYSCALLS_REQUIRE_FILESYSTEM
	if (isNaN(offset)) return {{{ cDefs.EOVERFLOW }}};
	var stream = SYSCALLS.getStreamFromFD(fd);
	FS.llseek(stream, offset, whence);
	{{{ makeSetValue('newOffset', '0', 'stream.position', 'i64') }}};
	if (stream.getdents && offset === 0 && whence === {{{ cDefs.SEEK_SET }}}) stream.getdents = null; // reset readdir state
	return 0;
	#else
	return {{{ cDefs.ESPIPE }}};
	#endif
	},

	$wasiRightsToMuslOFlags: (rights) => {
	#if SYSCALL_DEBUG
	dbg(`wasiRightsToMuslOFlags: ${rights}`);
	#endif
	if ((rights & {{{ cDefs.__WASI_RIGHTS_FD_READ }}}) && (rights & {{{ cDefs.__WASI_RIGHTS_FD_WRITE }}})) {
	return {{{ cDefs.O_RDWR }}};
	}
	if (rights & {{{ cDefs.__WASI_RIGHTS_FD_READ }}}) {
	return {{{ cDefs.O_RDONLY }}};
	}
	if (rights & {{{ cDefs.__WASI_RIGHTS_FD_WRITE }}}) {
	return {{{ cDefs.O_WRONLY }}};
	}
	throw new FS.ErrnoError({{{ cDefs.EINVAL }}});
	},

	$wasiOFlagsToMuslOFlags: (oflags) => {
	var musl_oflags = 0;
	if (oflags & {{{ cDefs.__WASI_OFLAGS_CREAT }}}) {
	musl_oflags \|= {{{ cDefs.O_CREAT }}};
	}
	if (oflags & {{{ cDefs.__WASI_OFLAGS_TRUNC }}}) {
	musl_oflags \|= {{{ cDefs.O_TRUNC }}};
	}
	if (oflags & {{{ cDefs.__WASI_OFLAGS_DIRECTORY }}}) {
	musl_oflags \|= {{{ cDefs.O_DIRECTORY }}};
	}
	if (oflags & {{{ cDefs.__WASI_OFLAGS_EXCL }}}) {
	musl_oflags \|= {{{ cDefs.O_EXCL }}};
	}
	return musl_oflags;
	},

	#if PURE_WASI
	// preopen maps open file descriptors to pathname.
	// In emscripten we already have a VFS layer so (for now) we expose the entire
	// VFS to the wasi API.
	$preopens: "{3: '/'}",

	path_open__sig: 'iiiiiiiiii',
	path_open__deps: ['$wasiRightsToMuslOFlags', '$wasiOFlagsToMuslOFlags', '$preopens'],
	path_open: (fd, dirflags, path, path_len, oflags,
	fs_rights_base, fs_rights_inherting,
	fdflags, opened_fd) => {
	if (!(fd in preopens)) {
	return {{{ cDefs.EBADF }}};
	}
	var pathname = UTF8ToString(path, path_len);
	var musl_oflags = wasiRightsToMuslOFlags(Number(fs_rights_base));
	#if SYSCALL_DEBUG
	dbg(`oflags1: ${ptrToString(musl_oflags)}`);
	#endif
	musl_oflags \|= wasiOFlagsToMuslOFlags(Number(oflags));
	#if SYSCALL_DEBUG
	dbg(`oflags2: ${ptrToString(musl_oflags)}`);
	#endif
	var stream = FS.open(pathname, musl_oflags);
	{{{ makeSetValue('opened_fd', '0', 'stream.fd', 'i32') }}};
	return 0;
	},

	fd_prestat_dir_name__deps: ['$preopens'],
	fd_prestat_dir_name__sig: 'iiii',
	fd_prestat_dir_name__nothrow: true,
	fd_prestat_dir_name: (fd, path, path_len) => {
	if (!(fd in preopens)) {
	return {{{ cDefs.EBADF }}};
	}
	var preopen_path = preopens[fd];
	stringToUTF8Array(preopen_path, HEAP8, path, path_len)
	#if SYSCALL_DEBUG
	dbg(`fd_prestat_dir_name -> "${preopen_path}"`);
	#endif
	return 0;
	},

	fd_prestat_get__deps: ['$preopens'],
	fd_prestat_get__sig: 'iii',
	fd_prestat_get__nothrow: true,
	fd_prestat_get: (fd, stat_buf) => {
	if (!(fd in preopens)) {
	return {{{ cDefs.EBADF }}};
	}
	var preopen = preopens[fd];
	{{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_prestat_t.pr_type, cDefs.__WASI_PREOPENTYPE_DIR, 'i8') }}};
	{{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_prestat_t.u + C_STRUCTS.__wasi_prestat_dir_t.pr_name_len, 'preopen.length', 'i64') }}};
	return 0;
	},

	fd_fdstat_set_flags__sig: 'iii',
	fd_fdstat_set_flags: (fd, flags) => {
	// TODO(sbc): implement
	var stream = SYSCALLS.getStreamFromFD(fd);
	return 0;
	},

	fd_filestat_get__sig: 'iii',
	fd_filestat_get: (fd, stat_buf) => {
	// TODO(sbc): implement
	var stream = SYSCALLS.getStreamFromFD(fd);
	{{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.dev, '0', 'i64') }}};
	{{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.ino, '0', 'i64') }}};
	{{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.filetype, '0', 'i8') }}};
	{{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.nlink, '0', 'i64') }}};
	{{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.size, '0', 'i64') }}};
	{{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.atim, '0', 'i64') }}};
	{{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.mtim, '0', 'i64') }}};
	{{{ makeSetValue('stat_buf', C_STRUCTS.__wasi_filestat_t.ctim, '0', 'i64') }}};
	return 0;
	},
	#endif

	#if PURE_WASI
	fd_fdstat_get__deps: ['$preopens'],
	#endif
	fd_fdstat_get: (fd, pbuf) => {
	var rightsBase = 0;
	var rightsInheriting = 0;
	var flags = 0;
	#if PURE_WASI
	if (fd in preopens) {
	var type = {{{ cDefs.__WASI_FILETYPE_DIRECTORY }}};
	rightsBase = {{{ cDefs.__WASI_RIGHTS_PATH_CREATE_FILE \|
	cDefs.__WASI_RIGHTS_PATH_OPEN }}};
	rightsInheriting = {{{ cDefs.__WASI_RIGHTS_FD_READ \|
	cDefs.__WASI_RIGHTS_FD_WRITE }}}
	} else
	#endif
	{
	#if SYSCALLS_REQUIRE_FILESYSTEM
	var stream = SYSCALLS.getStreamFromFD(fd);
	// All character devices are terminals (other things a Linux system would
	// assume is a character device, like the mouse, we have special APIs for).
	var type = stream.tty ? {{{ cDefs.__WASI_FILETYPE_CHARACTER_DEVICE }}} :
	FS.isDir(stream.mode) ? {{{ cDefs.__WASI_FILETYPE_DIRECTORY }}} :
	FS.isLink(stream.mode) ? {{{ cDefs.__WASI_FILETYPE_SYMBOLIC_LINK }}} :
	{{{ cDefs.__WASI_FILETYPE_REGULAR_FILE }}};
	#else
	// Hack to support printf in SYSCALLS_REQUIRE_FILESYSTEM=0. We support at
	// least stdin, stdout, stderr in a simple way.
	#if ASSERTIONS
	assert(fd == 0 \|\| fd == 1 \|\| fd == 2);
	#endif
	var type = {{{ cDefs.__WASI_FILETYPE_CHARACTER_DEVICE }}};
	if (fd == 0) {
	rightsBase = {{{ cDefs.__WASI_RIGHTS_FD_READ }}};
	} else if (fd == 1 \|\| fd == 2) {
	rightsBase = {{{ cDefs.__WASI_RIGHTS_FD_WRITE }}};
	}
	flags = {{{ cDefs.__WASI_FDFLAGS_APPEND }}};
	#endif
	}
	{{{ makeSetValue('pbuf', C_STRUCTS.__wasi_fdstat_t.fs_filetype, 'type', 'i8') }}};
	{{{ makeSetValue('pbuf', C_STRUCTS.__wasi_fdstat_t.fs_flags, 'flags', 'i16') }}};
	{{{ makeSetValue('pbuf', C_STRUCTS.__wasi_fdstat_t.fs_rights_base, 'rightsBase', 'i64') }}};
	{{{ makeSetValue('pbuf', C_STRUCTS.__wasi_fdstat_t.fs_rights_inheriting, 'rightsInheriting', 'i64') }}};
	return 0;
	},

	fd_sync: (fd) => {
	#if SYSCALLS_REQUIRE_FILESYSTEM
	var stream = SYSCALLS.getStreamFromFD(fd);
	#if ASYNCIFY
	return Asyncify.handleSleep(function(wakeUp) {
	var mount = stream.node.mount;
	if (!mount.type.syncfs) {
	// We write directly to the file system, so there's nothing to do here.
	wakeUp(0);
	return;
	}
	mount.type.syncfs(mount, false, function(err) {
	if (err) {
	wakeUp(function() { return {{{ cDefs.EIO }}} });
	return;
	}
	wakeUp(0);
	});
	});
	#else
	if (stream.stream_ops && stream.stream_ops.fsync) {
	return stream.stream_ops.fsync(stream);
	}
	return 0; // we can't do anything synchronously; the in-memory FS is already synced to
	#endif // ASYNCIFY
	#elif ASSERTIONS
	abort('fd_sync called without SYSCALLS_REQUIRE_FILESYSTEM');
	#else
	return {{{ cDefs.ENOSYS }}};
	#endif // SYSCALLS_REQUIRE_FILESYSTEM
	},
	};

	for (var x in WasiLibrary) {
	wrapSyscallFunction(x, WasiLibrary, true);
	}

	mergeInto(LibraryManager.library, WasiLibrary);