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library_syscall.js
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library_syscall.js
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/**
* @license
* Copyright 2015 The Emscripten Authors
* SPDX-License-Identifier: MIT
*/
var SyscallsLibrary = {
$SYSCALLS__deps: [
#if FILESYSTEM && SYSCALLS_REQUIRE_FILESYSTEM
'$PATH',
'$FS',
#endif
#if SYSCALL_DEBUG
'$strError',
#endif
],
$SYSCALLS: {
#if SYSCALLS_REQUIRE_FILESYSTEM
// global constants
DEFAULT_POLLMASK: {{{ cDefs.POLLIN }}} | {{{ cDefs.POLLOUT }}},
// shared utilities
calculateAt(dirfd, path, allowEmpty) {
if (PATH.isAbs(path)) {
return path;
}
// relative path
var dir;
if (dirfd === {{{ cDefs.AT_FDCWD }}}) {
dir = FS.cwd();
} else {
var dirstream = SYSCALLS.getStreamFromFD(dirfd);
dir = dirstream.path;
}
if (path.length == 0) {
if (!allowEmpty) {
throw new FS.ErrnoError({{{ cDefs.ENOENT }}});;
}
return dir;
}
return PATH.join2(dir, path);
},
doStat(func, path, buf) {
var stat = func(path);
{{{ makeSetValue('buf', C_STRUCTS.stat.st_dev, 'stat.dev', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_mode, 'stat.mode', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_nlink, 'stat.nlink', SIZE_TYPE) }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_uid, 'stat.uid', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_gid, 'stat.gid', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_rdev, 'stat.rdev', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_size, 'stat.size', 'i64') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_blksize, '4096', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_blocks, 'stat.blocks', 'i32') }}};
var atime = stat.atime.getTime();
var mtime = stat.mtime.getTime();
var ctime = stat.ctime.getTime();
{{{ makeSetValue('buf', C_STRUCTS.stat.st_atim.tv_sec, 'Math.floor(atime / 1000)', 'i64') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_atim.tv_nsec, '(atime % 1000) * 1000 * 1000', SIZE_TYPE) }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_mtim.tv_sec, 'Math.floor(mtime / 1000)', 'i64') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_mtim.tv_nsec, '(mtime % 1000) * 1000 * 1000', SIZE_TYPE) }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_ctim.tv_sec, 'Math.floor(ctime / 1000)', 'i64') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_ctim.tv_nsec, '(ctime % 1000) * 1000 * 1000', SIZE_TYPE) }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_ino, 'stat.ino', 'i64') }}};
return 0;
},
doMsync(addr, stream, len, flags, offset) {
if (!FS.isFile(stream.node.mode)) {
throw new FS.ErrnoError({{{ cDefs.ENODEV }}});
}
if (flags & {{{ cDefs.MAP_PRIVATE }}}) {
// MAP_PRIVATE calls need not to be synced back to underlying fs
return 0;
}
var buffer = HEAPU8.slice(addr, addr + len);
FS.msync(stream, buffer, offset, len, flags);
},
// Just like `FS.getStream` but will throw EBADF if stream is undefined.
getStreamFromFD(fd) {
var stream = FS.getStreamChecked(fd);
#if SYSCALL_DEBUG
dbg(` (stream: "${stream.path}")`);
#endif
return stream;
},
#endif // SYSCALLS_REQUIRE_FILESYSTEM
varargs: undefined,
getStr(ptr) {
var ret = UTF8ToString(ptr);
#if SYSCALL_DEBUG
dbg(` (str: "${ret}")`);
#endif
return ret;
},
},
$syscallGetVarargI__internal: true,
$syscallGetVarargI: function() {
#if ASSERTIONS
assert(SYSCALLS.varargs != undefined);
#endif
// the `+` prepended here is necessary to convince the JSCompiler that varargs is indeed a number.
var ret = {{{ makeGetValue('+SYSCALLS.varargs', 0, 'i32') }}};
SYSCALLS.varargs += 4;
#if SYSCALL_DEBUG
dbg(` (raw: "${ret}")`);
#endif
return ret;
},
$syscallGetVarargP__internal: true,
#if MEMORY64
$syscallGetVarargP: function() {
#if ASSERTIONS
assert(SYSCALLS.varargs != undefined);
#endif
var ret = {{{ makeGetValue('SYSCALLS.varargs', 0, '*') }}};
SYSCALLS.varargs += {{{ POINTER_SIZE }}};
#if SYSCALL_DEBUG
dbg(` (raw: "${ret}")`);
#endif
return ret;
},
#else
$syscallGetVarargP: '$syscallGetVarargI',
#endif
_mmap_js__i53abi: true,
_mmap_js__deps: ['$SYSCALLS',
#if FILESYSTEM && SYSCALLS_REQUIRE_FILESYSTEM
'$FS',
// The dependency of FS on `mmapAlloc` and `mmapAlloc` on
// `emscripten_builtin_memalign` are not encoding as hard dependencies,
// so we need to explicitly depend on them here to ensure a working
// `FS.mmap`.
// `emscripten_builtin_memalign`).
'$mmapAlloc',
'emscripten_builtin_memalign',
#endif
],
_mmap_js: (len, prot, flags, fd, offset, allocated, addr) => {
#if FILESYSTEM && SYSCALLS_REQUIRE_FILESYSTEM
if (isNaN(offset)) return {{{ cDefs.EOVERFLOW }}};
var stream = SYSCALLS.getStreamFromFD(fd);
var res = FS.mmap(stream, len, offset, prot, flags);
var ptr = res.ptr;
{{{ makeSetValue('allocated', 0, 'res.allocated', 'i32') }}};
{{{ makeSetValue('addr', 0, 'ptr', '*') }}};
return 0;
#else // no filesystem support; report lack of support
return -{{{ cDefs.ENOSYS }}};
#endif
},
_munmap_js__i53abi: true,
_munmap_js: (addr, len, prot, flags, fd, offset) => {
#if FILESYSTEM && SYSCALLS_REQUIRE_FILESYSTEM
var stream = SYSCALLS.getStreamFromFD(fd);
if (prot & {{{ cDefs.PROT_WRITE }}}) {
SYSCALLS.doMsync(addr, stream, len, flags, offset);
}
#endif
},
__syscall_chdir: (path) => {
path = SYSCALLS.getStr(path);
FS.chdir(path);
return 0;
},
__syscall_chmod: (path, mode) => {
path = SYSCALLS.getStr(path);
FS.chmod(path, mode);
return 0;
},
__syscall_rmdir: (path) => {
path = SYSCALLS.getStr(path);
FS.rmdir(path);
return 0;
},
__syscall_dup: (fd) => {
var old = SYSCALLS.getStreamFromFD(fd);
return FS.dupStream(old).fd;
},
__syscall_pipe__deps: ['$PIPEFS'],
__syscall_pipe: (fdPtr) => {
if (fdPtr == 0) {
throw new FS.ErrnoError({{{ cDefs.EFAULT }}});
}
var res = PIPEFS.createPipe();
{{{ makeSetValue('fdPtr', 0, 'res.readable_fd', 'i32') }}};
{{{ makeSetValue('fdPtr', 4, 'res.writable_fd', 'i32') }}};
return 0;
},
#if SYSCALLS_REQUIRE_FILESYSTEM
__syscall_ioctl__deps: ['$syscallGetVarargP'],
#endif
__syscall_ioctl: (fd, op, varargs) => {
#if SYSCALLS_REQUIRE_FILESYSTEM == 0
#if SYSCALL_DEBUG
dbg('no-op in ioctl syscall due to SYSCALLS_REQUIRE_FILESYSTEM=0');
#endif
return 0;
#else
var stream = SYSCALLS.getStreamFromFD(fd);
switch (op) {
case {{{ cDefs.TCGETA }}}: {
if (!stream.tty) return -{{{ cDefs.ENOTTY }}};
#if SYSCALL_DEBUG
dbg('warning: not filling tio struct');
#endif
return 0;
}
case {{{ cDefs.TCGETS }}}: {
if (!stream.tty) return -{{{ cDefs.ENOTTY }}};
if (stream.tty.ops.ioctl_tcgets) {
var termios = stream.tty.ops.ioctl_tcgets(stream);
var argp = syscallGetVarargP();
{{{ makeSetValue('argp', C_STRUCTS.termios.c_iflag, 'termios.c_iflag || 0', 'i32') }}};
{{{ makeSetValue('argp', C_STRUCTS.termios.c_oflag, 'termios.c_oflag || 0', 'i32') }}};
{{{ makeSetValue('argp', C_STRUCTS.termios.c_cflag, 'termios.c_cflag || 0', 'i32') }}};
{{{ makeSetValue('argp', C_STRUCTS.termios.c_lflag, 'termios.c_lflag || 0', 'i32') }}};
for (var i = 0; i < {{{ cDefs.NCCS }}}; i++) {
{{{ makeSetValue('argp + i', C_STRUCTS.termios.c_cc, 'termios.c_cc[i] || 0', 'i8') }}};
}
return 0;
}
#if SYSCALL_DEBUG
dbg('warning: not filling tio struct');
#endif
return 0;
}
case {{{ cDefs.TCSETA }}}:
case {{{ cDefs.TCSETAW }}}:
case {{{ cDefs.TCSETAF }}}: {
if (!stream.tty) return -{{{ cDefs.ENOTTY }}};
return 0; // no-op, not actually adjusting terminal settings
}
case {{{ cDefs.TCSETS }}}:
case {{{ cDefs.TCSETSW }}}:
case {{{ cDefs.TCSETSF }}}: {
if (!stream.tty) return -{{{ cDefs.ENOTTY }}};
if (stream.tty.ops.ioctl_tcsets) {
var argp = syscallGetVarargP();
var c_iflag = {{{ makeGetValue('argp', C_STRUCTS.termios.c_iflag, 'i32') }}};
var c_oflag = {{{ makeGetValue('argp', C_STRUCTS.termios.c_oflag, 'i32') }}};
var c_cflag = {{{ makeGetValue('argp', C_STRUCTS.termios.c_cflag, 'i32') }}};
var c_lflag = {{{ makeGetValue('argp', C_STRUCTS.termios.c_lflag, 'i32') }}};
var c_cc = []
for (var i = 0; i < {{{ cDefs.NCCS }}}; i++) {
c_cc.push({{{ makeGetValue('argp + i', C_STRUCTS.termios.c_cc, 'i8') }}});
}
return stream.tty.ops.ioctl_tcsets(stream.tty, op, { c_iflag, c_oflag, c_cflag, c_lflag, c_cc });
}
return 0; // no-op, not actually adjusting terminal settings
}
case {{{ cDefs.TIOCGPGRP }}}: {
if (!stream.tty) return -{{{ cDefs.ENOTTY }}};
var argp = syscallGetVarargP();
{{{ makeSetValue('argp', 0, 0, 'i32') }}};
return 0;
}
case {{{ cDefs.TIOCSPGRP }}}: {
if (!stream.tty) return -{{{ cDefs.ENOTTY }}};
return -{{{ cDefs.EINVAL }}}; // not supported
}
case {{{ cDefs.FIONREAD }}}: {
var argp = syscallGetVarargP();
return FS.ioctl(stream, op, argp);
}
case {{{ cDefs.TIOCGWINSZ }}}: {
// TODO: in theory we should write to the winsize struct that gets
// passed in, but for now musl doesn't read anything on it
if (!stream.tty) return -{{{ cDefs.ENOTTY }}};
if (stream.tty.ops.ioctl_tiocgwinsz) {
var winsize = stream.tty.ops.ioctl_tiocgwinsz(stream.tty);
var argp = syscallGetVarargP();
{{{ makeSetValue('argp', 0, 'winsize[0]', 'i16') }}};
{{{ makeSetValue('argp', 2, 'winsize[1]', 'i16') }}};
}
return 0;
}
case {{{ cDefs.TIOCSWINSZ }}}: {
// TODO: technically, this ioctl call should change the window size.
// but, since emscripten doesn't have any concept of a terminal window
// yet, we'll just silently throw it away as we do TIOCGWINSZ
if (!stream.tty) return -{{{ cDefs.ENOTTY }}};
return 0;
}
case {{{ cDefs.TCFLSH }}}: {
if (!stream.tty) return -{{{ cDefs.ENOTTY }}};
return 0;
}
default: return -{{{ cDefs.EINVAL }}}; // not supported
}
#endif // SYSCALLS_REQUIRE_FILESYSTEM
},
__syscall_symlink: (target, linkpath) => {
target = SYSCALLS.getStr(target);
linkpath = SYSCALLS.getStr(linkpath);
FS.symlink(target, linkpath);
return 0;
},
__syscall_fchmod: (fd, mode) => {
FS.fchmod(fd, mode);
return 0;
},
// When building with PROXY_POSIX_SOCKETS the socket syscalls are implemented
// natively in libsockets.a.
// When building with WASMFS the socket syscalls are implemented natively in
// libwasmfs.a.
#if PROXY_POSIX_SOCKETS == 0 && WASMFS == 0
$getSocketFromFD__deps: ['$SOCKFS', '$FS'],
$getSocketFromFD: (fd) => {
var socket = SOCKFS.getSocket(fd);
if (!socket) throw new FS.ErrnoError({{{ cDefs.EBADF }}});
#if SYSCALL_DEBUG
dbg(` (socket: "${socket.path}")`);
#endif
return socket;
},
/** @param {boolean=} allowNull */
$getSocketAddress__deps: ['$readSockaddr', '$FS', '$DNS'],
$getSocketAddress__docs: '/** @param {boolean=} allowNull */',
$getSocketAddress: (addrp, addrlen, allowNull) => {
if (allowNull && addrp === 0) return null;
var info = readSockaddr(addrp, addrlen);
if (info.errno) throw new FS.ErrnoError(info.errno);
info.addr = DNS.lookup_addr(info.addr) || info.addr;
#if SYSCALL_DEBUG
dbg(' (socketaddress: "' + [info.addr, info.port] + '")');
#endif
return info;
},
__syscall_socket__deps: ['$SOCKFS'],
__syscall_socket: (domain, type, protocol) => {
var sock = SOCKFS.createSocket(domain, type, protocol);
#if ASSERTIONS
assert(sock.stream.fd < 64); // XXX ? select() assumes socket fd values are in 0..63
#endif
return sock.stream.fd;
},
__syscall_getsockname__deps: ['$getSocketFromFD', '$writeSockaddr', '$DNS'],
__syscall_getsockname: (fd, addr, addrlen, d1, d2, d3) => {
var sock = getSocketFromFD(fd);
// TODO: sock.saddr should never be undefined, see TODO in websocket_sock_ops.getname
var errno = writeSockaddr(addr, sock.family, DNS.lookup_name(sock.saddr || '0.0.0.0'), sock.sport, addrlen);
#if ASSERTIONS
assert(!errno);
#endif
return 0;
},
__syscall_getpeername__deps: ['$getSocketFromFD', '$writeSockaddr', '$DNS'],
__syscall_getpeername: (fd, addr, addrlen, d1, d2, d3) => {
var sock = getSocketFromFD(fd);
if (!sock.daddr) {
return -{{{ cDefs.ENOTCONN }}}; // The socket is not connected.
}
var errno = writeSockaddr(addr, sock.family, DNS.lookup_name(sock.daddr), sock.dport, addrlen);
#if ASSERTIONS
assert(!errno);
#endif
return 0;
},
__syscall_connect__deps: ['$getSocketFromFD', '$getSocketAddress'],
__syscall_connect: (fd, addr, addrlen, d1, d2, d3) => {
var sock = getSocketFromFD(fd);
var info = getSocketAddress(addr, addrlen);
sock.sock_ops.connect(sock, info.addr, info.port);
return 0;
},
__syscall_shutdown__deps: ['$getSocketFromFD'],
__syscall_shutdown: (fd, how) => {
getSocketFromFD(fd);
return -{{{ cDefs.ENOSYS }}}; // unsupported feature
},
__syscall_accept4__deps: ['$getSocketFromFD', '$writeSockaddr', '$DNS'],
__syscall_accept4: (fd, addr, addrlen, flags, d1, d2) => {
var sock = getSocketFromFD(fd);
var newsock = sock.sock_ops.accept(sock);
if (addr) {
var errno = writeSockaddr(addr, newsock.family, DNS.lookup_name(newsock.daddr), newsock.dport, addrlen);
#if ASSERTIONS
assert(!errno);
#endif
}
return newsock.stream.fd;
},
__syscall_bind__deps: ['$getSocketFromFD', '$getSocketAddress'],
__syscall_bind: (fd, addr, addrlen, d1, d2, d3) => {
var sock = getSocketFromFD(fd);
var info = getSocketAddress(addr, addrlen);
sock.sock_ops.bind(sock, info.addr, info.port);
return 0;
},
__syscall_listen__deps: ['$getSocketFromFD'],
__syscall_listen: (fd, backlog) => {
var sock = getSocketFromFD(fd);
sock.sock_ops.listen(sock, backlog);
return 0;
},
__syscall_recvfrom__deps: ['$getSocketFromFD', '$writeSockaddr', '$DNS'],
__syscall_recvfrom: (fd, buf, len, flags, addr, addrlen) => {
var sock = getSocketFromFD(fd);
var msg = sock.sock_ops.recvmsg(sock, len);
if (!msg) return 0; // socket is closed
if (addr) {
var errno = writeSockaddr(addr, sock.family, DNS.lookup_name(msg.addr), msg.port, addrlen);
#if ASSERTIONS
assert(!errno);
#endif
}
HEAPU8.set(msg.buffer, buf);
return msg.buffer.byteLength;
},
__syscall_sendto__deps: ['$getSocketFromFD', '$getSocketAddress'],
__syscall_sendto: (fd, message, length, flags, addr, addr_len) => {
var sock = getSocketFromFD(fd);
var dest = getSocketAddress(addr, addr_len, true);
if (!dest) {
// send, no address provided
return FS.write(sock.stream, HEAP8, message, length);
}
// sendto an address
return sock.sock_ops.sendmsg(sock, HEAP8, message, length, dest.addr, dest.port);
},
__syscall_getsockopt__deps: ['$getSocketFromFD'],
__syscall_getsockopt: (fd, level, optname, optval, optlen, d1) => {
var sock = getSocketFromFD(fd);
// Minimal getsockopt aimed at resolving https://github.com/emscripten-core/emscripten/issues/2211
// so only supports SOL_SOCKET with SO_ERROR.
if (level === {{{ cDefs.SOL_SOCKET }}}) {
if (optname === {{{ cDefs.SO_ERROR }}}) {
{{{ makeSetValue('optval', 0, 'sock.error', 'i32') }}};
{{{ makeSetValue('optlen', 0, 4, 'i32') }}};
sock.error = null; // Clear the error (The SO_ERROR option obtains and then clears this field).
return 0;
}
}
return -{{{ cDefs.ENOPROTOOPT }}}; // The option is unknown at the level indicated.
},
__syscall_sendmsg__deps: ['$getSocketFromFD', '$readSockaddr', '$DNS'],
__syscall_sendmsg: (fd, message, flags, d1, d2, d3) => {
var sock = getSocketFromFD(fd);
var iov = {{{ makeGetValue('message', C_STRUCTS.msghdr.msg_iov, '*') }}};
var num = {{{ makeGetValue('message', C_STRUCTS.msghdr.msg_iovlen, 'i32') }}};
// read the address and port to send to
var addr, port;
var name = {{{ makeGetValue('message', C_STRUCTS.msghdr.msg_name, '*') }}};
var namelen = {{{ makeGetValue('message', C_STRUCTS.msghdr.msg_namelen, 'i32') }}};
if (name) {
var info = readSockaddr(name, namelen);
if (info.errno) return -info.errno;
port = info.port;
addr = DNS.lookup_addr(info.addr) || info.addr;
}
// concatenate scatter-gather arrays into one message buffer
var total = 0;
for (var i = 0; i < num; i++) {
total += {{{ makeGetValue('iov', `(${C_STRUCTS.iovec.__size__} * i) + ${C_STRUCTS.iovec.iov_len}`, 'i32') }}};
}
var view = new Uint8Array(total);
var offset = 0;
for (var i = 0; i < num; i++) {
var iovbase = {{{ makeGetValue('iov', `(${C_STRUCTS.iovec.__size__} * i) + ${C_STRUCTS.iovec.iov_base}`, POINTER_TYPE) }}};
var iovlen = {{{ makeGetValue('iov', `(${C_STRUCTS.iovec.__size__} * i) + ${C_STRUCTS.iovec.iov_len}`, 'i32') }}};
for (var j = 0; j < iovlen; j++) {
view[offset++] = {{{ makeGetValue('iovbase', 'j', 'i8') }}};
}
}
// write the buffer
return sock.sock_ops.sendmsg(sock, view, 0, total, addr, port);
},
__syscall_recvmsg__deps: ['$getSocketFromFD', '$writeSockaddr', '$DNS'],
__syscall_recvmsg: (fd, message, flags, d1, d2, d3) => {
var sock = getSocketFromFD(fd);
var iov = {{{ makeGetValue('message', C_STRUCTS.msghdr.msg_iov, POINTER_TYPE) }}};
var num = {{{ makeGetValue('message', C_STRUCTS.msghdr.msg_iovlen, 'i32') }}};
// get the total amount of data we can read across all arrays
var total = 0;
for (var i = 0; i < num; i++) {
total += {{{ makeGetValue('iov', `(${C_STRUCTS.iovec.__size__} * i) + ${C_STRUCTS.iovec.iov_len}`, 'i32') }}};
}
// try to read total data
var msg = sock.sock_ops.recvmsg(sock, total);
if (!msg) return 0; // socket is closed
// TODO honor flags:
// MSG_OOB
// Requests out-of-band data. The significance and semantics of out-of-band data are protocol-specific.
// MSG_PEEK
// Peeks at the incoming message.
// MSG_WAITALL
// Requests that the function block until the full amount of data requested can be returned. The function may return a smaller amount of data if a signal is caught, if the connection is terminated, if MSG_PEEK was specified, or if an error is pending for the socket.
// write the source address out
var name = {{{ makeGetValue('message', C_STRUCTS.msghdr.msg_name, '*') }}};
if (name) {
var errno = writeSockaddr(name, sock.family, DNS.lookup_name(msg.addr), msg.port);
#if ASSERTIONS
assert(!errno);
#endif
}
// write the buffer out to the scatter-gather arrays
var bytesRead = 0;
var bytesRemaining = msg.buffer.byteLength;
for (var i = 0; bytesRemaining > 0 && i < num; i++) {
var iovbase = {{{ makeGetValue('iov', `(${C_STRUCTS.iovec.__size__} * i) + ${C_STRUCTS.iovec.iov_base}`, POINTER_TYPE) }}};
var iovlen = {{{ makeGetValue('iov', `(${C_STRUCTS.iovec.__size__} * i) + ${C_STRUCTS.iovec.iov_len}`, 'i32') }}};
if (!iovlen) {
continue;
}
var length = Math.min(iovlen, bytesRemaining);
var buf = msg.buffer.subarray(bytesRead, bytesRead + length);
HEAPU8.set(buf, iovbase + bytesRead);
bytesRead += length;
bytesRemaining -= length;
}
// TODO set msghdr.msg_flags
// MSG_EOR
// End of record was received (if supported by the protocol).
// MSG_OOB
// Out-of-band data was received.
// MSG_TRUNC
// Normal data was truncated.
// MSG_CTRUNC
return bytesRead;
},
#endif // ~PROXY_POSIX_SOCKETS==0
__syscall_fchdir: (fd) => {
var stream = SYSCALLS.getStreamFromFD(fd);
FS.chdir(stream.path);
return 0;
},
__syscall__newselect: (nfds, readfds, writefds, exceptfds, timeout) => {
// readfds are supported,
// writefds checks socket open status
// exceptfds are supported, although on web, such exceptional conditions never arise in web sockets
// and so the exceptfds list will always return empty.
// timeout is supported, although on SOCKFS and PIPEFS these are ignored and always treated as 0 - fully async
#if ASSERTIONS
assert(nfds <= 64, 'nfds must be less than or equal to 64'); // fd sets have 64 bits // TODO: this could be 1024 based on current musl headers
#endif
var total = 0;
var srcReadLow = (readfds ? {{{ makeGetValue('readfds', 0, 'i32') }}} : 0),
srcReadHigh = (readfds ? {{{ makeGetValue('readfds', 4, 'i32') }}} : 0);
var srcWriteLow = (writefds ? {{{ makeGetValue('writefds', 0, 'i32') }}} : 0),
srcWriteHigh = (writefds ? {{{ makeGetValue('writefds', 4, 'i32') }}} : 0);
var srcExceptLow = (exceptfds ? {{{ makeGetValue('exceptfds', 0, 'i32') }}} : 0),
srcExceptHigh = (exceptfds ? {{{ makeGetValue('exceptfds', 4, 'i32') }}} : 0);
var dstReadLow = 0,
dstReadHigh = 0;
var dstWriteLow = 0,
dstWriteHigh = 0;
var dstExceptLow = 0,
dstExceptHigh = 0;
var allLow = (readfds ? {{{ makeGetValue('readfds', 0, 'i32') }}} : 0) |
(writefds ? {{{ makeGetValue('writefds', 0, 'i32') }}} : 0) |
(exceptfds ? {{{ makeGetValue('exceptfds', 0, 'i32') }}} : 0);
var allHigh = (readfds ? {{{ makeGetValue('readfds', 4, 'i32') }}} : 0) |
(writefds ? {{{ makeGetValue('writefds', 4, 'i32') }}} : 0) |
(exceptfds ? {{{ makeGetValue('exceptfds', 4, 'i32') }}} : 0);
var check = function(fd, low, high, val) {
return (fd < 32 ? (low & val) : (high & val));
};
for (var fd = 0; fd < nfds; fd++) {
var mask = 1 << (fd % 32);
if (!(check(fd, allLow, allHigh, mask))) {
continue; // index isn't in the set
}
var stream = SYSCALLS.getStreamFromFD(fd);
var flags = SYSCALLS.DEFAULT_POLLMASK;
if (stream.stream_ops.poll) {
var timeoutInMillis = -1;
if (timeout) {
// select(2) is declared to accept "struct timeval { time_t tv_sec; suseconds_t tv_usec; }".
// However, musl passes the two values to the syscall as an array of long values.
// Note that sizeof(time_t) != sizeof(long) in wasm32. The former is 8, while the latter is 4.
// This means using "C_STRUCTS.timeval.tv_usec" leads to a wrong offset.
// So, instead, we use POINTER_SIZE.
var tv_sec = (readfds ? {{{ makeGetValue('timeout', 0, 'i32') }}} : 0),
tv_usec = (readfds ? {{{ makeGetValue('timeout', POINTER_SIZE, 'i32') }}} : 0);
timeoutInMillis = (tv_sec + tv_usec / 1000000) * 1000;
}
flags = stream.stream_ops.poll(stream, timeoutInMillis);
}
if ((flags & {{{ cDefs.POLLIN }}}) && check(fd, srcReadLow, srcReadHigh, mask)) {
fd < 32 ? (dstReadLow = dstReadLow | mask) : (dstReadHigh = dstReadHigh | mask);
total++;
}
if ((flags & {{{ cDefs.POLLOUT }}}) && check(fd, srcWriteLow, srcWriteHigh, mask)) {
fd < 32 ? (dstWriteLow = dstWriteLow | mask) : (dstWriteHigh = dstWriteHigh | mask);
total++;
}
if ((flags & {{{ cDefs.POLLPRI }}}) && check(fd, srcExceptLow, srcExceptHigh, mask)) {
fd < 32 ? (dstExceptLow = dstExceptLow | mask) : (dstExceptHigh = dstExceptHigh | mask);
total++;
}
}
if (readfds) {
{{{ makeSetValue('readfds', '0', 'dstReadLow', 'i32') }}};
{{{ makeSetValue('readfds', '4', 'dstReadHigh', 'i32') }}};
}
if (writefds) {
{{{ makeSetValue('writefds', '0', 'dstWriteLow', 'i32') }}};
{{{ makeSetValue('writefds', '4', 'dstWriteHigh', 'i32') }}};
}
if (exceptfds) {
{{{ makeSetValue('exceptfds', '0', 'dstExceptLow', 'i32') }}};
{{{ makeSetValue('exceptfds', '4', 'dstExceptHigh', 'i32') }}};
}
return total;
},
_msync_js__i53abi: true,
_msync_js: (addr, len, prot, flags, fd, offset) => {
if (isNaN(offset)) return {{{ cDefs.EOVERFLOW }}};
SYSCALLS.doMsync(addr, SYSCALLS.getStreamFromFD(fd), len, flags, offset);
return 0;
},
__syscall_fdatasync: (fd) => {
var stream = SYSCALLS.getStreamFromFD(fd);
return 0; // we can't do anything synchronously; the in-memory FS is already synced to
},
__syscall_poll: (fds, nfds, timeout) => {
var nonzero = 0;
for (var i = 0; i < nfds; i++) {
var pollfd = fds + {{{ C_STRUCTS.pollfd.__size__ }}} * i;
var fd = {{{ makeGetValue('pollfd', C_STRUCTS.pollfd.fd, 'i32') }}};
var events = {{{ makeGetValue('pollfd', C_STRUCTS.pollfd.events, 'i16') }}};
var mask = {{{ cDefs.POLLNVAL }}};
var stream = FS.getStream(fd);
if (stream) {
mask = SYSCALLS.DEFAULT_POLLMASK;
if (stream.stream_ops.poll) {
mask = stream.stream_ops.poll(stream, -1);
}
}
mask &= events | {{{ cDefs.POLLERR }}} | {{{ cDefs.POLLHUP }}};
if (mask) nonzero++;
{{{ makeSetValue('pollfd', C_STRUCTS.pollfd.revents, 'mask', 'i16') }}};
}
return nonzero;
},
__syscall_getcwd__deps: ['$lengthBytesUTF8', '$stringToUTF8'],
__syscall_getcwd: (buf, size) => {
if (size === 0) return -{{{ cDefs.EINVAL }}};
var cwd = FS.cwd();
var cwdLengthInBytes = lengthBytesUTF8(cwd) + 1;
if (size < cwdLengthInBytes) return -{{{ cDefs.ERANGE }}};
stringToUTF8(cwd, buf, size);
return cwdLengthInBytes;
},
__syscall_truncate64__i53abi: true,
__syscall_truncate64: (path, length) => {
if (isNaN(length)) return {{{ cDefs.EOVERFLOW }}};
path = SYSCALLS.getStr(path);
FS.truncate(path, length);
return 0;
},
__syscall_ftruncate64__i53abi: true,
__syscall_ftruncate64: (fd, length) => {
if (isNaN(length)) return {{{ cDefs.EOVERFLOW }}};
FS.ftruncate(fd, length);
return 0;
},
__syscall_stat64: (path, buf) => {
path = SYSCALLS.getStr(path);
return SYSCALLS.doStat(FS.stat, path, buf);
},
__syscall_lstat64: (path, buf) => {
path = SYSCALLS.getStr(path);
return SYSCALLS.doStat(FS.lstat, path, buf);
},
__syscall_fstat64: (fd, buf) => {
var stream = SYSCALLS.getStreamFromFD(fd);
return SYSCALLS.doStat(FS.stat, stream.path, buf);
},
__syscall_fchown32: (fd, owner, group) => {
FS.fchown(fd, owner, group);
return 0;
},
__syscall_getdents64__deps: ['$stringToUTF8'],
__syscall_getdents64: (fd, dirp, count) => {
var stream = SYSCALLS.getStreamFromFD(fd)
stream.getdents ||= FS.readdir(stream.path);
var struct_size = {{{ C_STRUCTS.dirent.__size__ }}};
var pos = 0;
var off = FS.llseek(stream, 0, {{{ cDefs.SEEK_CUR }}});
var idx = Math.floor(off / struct_size);
while (idx < stream.getdents.length && pos + struct_size <= count) {
var id;
var type;
var name = stream.getdents[idx];
if (name === '.') {
id = stream.node.id;
type = 4; // DT_DIR
}
else if (name === '..') {
var lookup = FS.lookupPath(stream.path, { parent: true });
id = lookup.node.id;
type = 4; // DT_DIR
}
else {
var child = FS.lookupNode(stream.node, name);
id = child.id;
type = FS.isChrdev(child.mode) ? 2 : // DT_CHR, character device.
FS.isDir(child.mode) ? 4 : // DT_DIR, directory.
FS.isLink(child.mode) ? 10 : // DT_LNK, symbolic link.
8; // DT_REG, regular file.
}
#if ASSERTIONS
assert(id);
#endif
{{{ makeSetValue('dirp + pos', C_STRUCTS.dirent.d_ino, 'id', 'i64') }}};
{{{ makeSetValue('dirp + pos', C_STRUCTS.dirent.d_off, '(idx + 1) * struct_size', 'i64') }}};
{{{ makeSetValue('dirp + pos', C_STRUCTS.dirent.d_reclen, C_STRUCTS.dirent.__size__, 'i16') }}};
{{{ makeSetValue('dirp + pos', C_STRUCTS.dirent.d_type, 'type', 'i8') }}};
stringToUTF8(name, dirp + pos + {{{ C_STRUCTS.dirent.d_name }}}, 256);
pos += struct_size;
idx += 1;
}
FS.llseek(stream, idx * struct_size, {{{ cDefs.SEEK_SET }}});
return pos;
},
#if SYSCALLS_REQUIRE_FILESYSTEM
__syscall_fcntl64__deps: ['$syscallGetVarargP', '$syscallGetVarargI'],
#endif
__syscall_fcntl64: (fd, cmd, varargs) => {
#if SYSCALLS_REQUIRE_FILESYSTEM == 0
#if SYSCALL_DEBUG
dbg('no-op in fcntl syscall due to SYSCALLS_REQUIRE_FILESYSTEM=0');
#endif
return 0;
#else
var stream = SYSCALLS.getStreamFromFD(fd);
switch (cmd) {
case {{{ cDefs.F_DUPFD }}}: {
var arg = syscallGetVarargI();
if (arg < 0) {
return -{{{ cDefs.EINVAL }}};
}
while (FS.streams[arg]) {
arg++;
}
var newStream;
newStream = FS.dupStream(stream, arg);
return newStream.fd;
}
case {{{ cDefs.F_GETFD }}}:
case {{{ cDefs.F_SETFD }}}:
return 0; // FD_CLOEXEC makes no sense for a single process.
case {{{ cDefs.F_GETFL }}}:
return stream.flags;
case {{{ cDefs.F_SETFL }}}: {
var arg = syscallGetVarargI();
stream.flags |= arg;
return 0;
}
case {{{ cDefs.F_GETLK }}}: {
var arg = syscallGetVarargP();
var offset = {{{ C_STRUCTS.flock.l_type }}};
// We're always unlocked.
{{{ makeSetValue('arg', 'offset', cDefs.F_UNLCK, 'i16') }}};
return 0;
}
case {{{ cDefs.F_SETLK }}}:
case {{{ cDefs.F_SETLKW }}}:
return 0; // Pretend that the locking is successful.
#if SYSCALL_DEBUG
case {{{ cDefs.F_GETOWN_EX }}}:
case {{{ cDefs.F_SETOWN }}}:
case {{{ cDefs.F_GETOWN }}}:
return -{{{ cDefs.EINVAL }}};
default:
dbg(`warning: fcntl unrecognized command ${cmd}`);
#endif
}
return -{{{ cDefs.EINVAL }}};
#endif // SYSCALLS_REQUIRE_FILESYSTEM
},
__syscall_statfs64: (path, size, buf) => {
path = SYSCALLS.getStr(path);
#if ASSERTIONS
assert(size === {{{ C_STRUCTS.statfs.__size__ }}});
#endif
// NOTE: None of the constants here are true. We're just returning safe and
// sane values.
{{{ makeSetValue('buf', C_STRUCTS.statfs.f_bsize, '4096', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.statfs.f_frsize, '4096', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.statfs.f_blocks, '1000000', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.statfs.f_bfree, '500000', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.statfs.f_bavail, '500000', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.statfs.f_files, 'FS.nextInode', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.statfs.f_ffree, '1000000', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.statfs.f_fsid, '42', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.statfs.f_flags, '2', 'i32') }}}; // ST_NOSUID
{{{ makeSetValue('buf', C_STRUCTS.statfs.f_namelen, '255', 'i32') }}};
return 0;
},
__syscall_fstatfs64__deps: ['__syscall_statfs64'],
__syscall_fstatfs64: (fd, size, buf) => {
var stream = SYSCALLS.getStreamFromFD(fd);
return ___syscall_statfs64(0, size, buf);
},
__syscall_fadvise64__nothrow: true,
__syscall_fadvise64__proxy: 'none',
__syscall_fadvise64: (fd, offset, len, advice) => {
return 0; // your advice is important to us (but we can't use it)
},
__syscall_openat__deps: ['$syscallGetVarargI'],
__syscall_openat: (dirfd, path, flags, varargs) => {
path = SYSCALLS.getStr(path);
path = SYSCALLS.calculateAt(dirfd, path);
var mode = varargs ? syscallGetVarargI() : 0;
return FS.open(path, flags, mode).fd;
},
__syscall_mkdirat: (dirfd, path, mode) => {
#if SYSCALL_DEBUG
dbg('warning: untested syscall');
#endif
path = SYSCALLS.getStr(path);
path = SYSCALLS.calculateAt(dirfd, path);
// remove a trailing slash, if one - /a/b/ has basename of '', but
// we want to create b in the context of this function
path = PATH.normalize(path);
if (path[path.length-1] === '/') path = path.substr(0, path.length-1);
FS.mkdir(path, mode, 0);
return 0;
},
__syscall_mknodat: (dirfd, path, mode, dev) => {
#if SYSCALL_DEBUG
dbg('warning: untested syscall');
#endif
path = SYSCALLS.getStr(path);
path = SYSCALLS.calculateAt(dirfd, path);
// we don't want this in the JS API as it uses mknod to create all nodes.
switch (mode & {{{ cDefs.S_IFMT }}}) {
case {{{ cDefs.S_IFREG }}}:
case {{{ cDefs.S_IFCHR }}}:
case {{{ cDefs.S_IFBLK }}}:
case {{{ cDefs.S_IFIFO }}}:
case {{{ cDefs.S_IFSOCK }}}:
break;
default: return -{{{ cDefs.EINVAL }}};
}
FS.mknod(path, mode, dev);
return 0;
},
__syscall_fchownat: (dirfd, path, owner, group, flags) => {
#if SYSCALL_DEBUG
dbg('warning: untested syscall');
#endif
path = SYSCALLS.getStr(path);
var nofollow = flags & {{{ cDefs.AT_SYMLINK_NOFOLLOW }}};
flags = flags & (~{{{ cDefs.AT_SYMLINK_NOFOLLOW }}});
#if ASSERTIONS
assert(flags === 0);
#endif
path = SYSCALLS.calculateAt(dirfd, path);
(nofollow ? FS.lchown : FS.chown)(path, owner, group);
return 0;
},
__syscall_newfstatat: (dirfd, path, buf, flags) => {
path = SYSCALLS.getStr(path);
var nofollow = flags & {{{ cDefs.AT_SYMLINK_NOFOLLOW }}};
var allowEmpty = flags & {{{ cDefs.AT_EMPTY_PATH }}};
flags = flags & (~{{{ cDefs.AT_SYMLINK_NOFOLLOW | cDefs.AT_EMPTY_PATH | cDefs.AT_NO_AUTOMOUNT }}});
#if ASSERTIONS
assert(!flags, `unknown flags in __syscall_newfstatat: ${flags}`);
#endif
path = SYSCALLS.calculateAt(dirfd, path, allowEmpty);
return SYSCALLS.doStat(nofollow ? FS.lstat : FS.stat, path, buf);
},
__syscall_unlinkat: (dirfd, path, flags) => {
path = SYSCALLS.getStr(path);
path = SYSCALLS.calculateAt(dirfd, path);
if (flags === 0) {
FS.unlink(path);
} else if (flags === {{{ cDefs.AT_REMOVEDIR }}}) {
FS.rmdir(path);
} else {
abort('Invalid flags passed to unlinkat');
}
return 0;
},
__syscall_renameat: (olddirfd, oldpath, newdirfd, newpath) => {
oldpath = SYSCALLS.getStr(oldpath);
newpath = SYSCALLS.getStr(newpath);
oldpath = SYSCALLS.calculateAt(olddirfd, oldpath);
newpath = SYSCALLS.calculateAt(newdirfd, newpath);
FS.rename(oldpath, newpath);
return 0;
},
__syscall_symlinkat: (target, newdirfd, linkpath) => {
#if SYSCALL_DEBUG
dbg('warning: untested syscall');
#endif
linkpath = SYSCALLS.calculateAt(newdirfd, linkpath);
FS.symlink(target, linkpath);
return 0;
},
__syscall_readlinkat__deps: ['$lengthBytesUTF8', '$stringToUTF8'],
__syscall_readlinkat: (dirfd, path, buf, bufsize) => {
path = SYSCALLS.getStr(path);
path = SYSCALLS.calculateAt(dirfd, path);
if (bufsize <= 0) return -{{{ cDefs.EINVAL }}};
var ret = FS.readlink(path);
var len = Math.min(bufsize, lengthBytesUTF8(ret));
var endChar = HEAP8[buf+len];
stringToUTF8(ret, buf, bufsize+1);
// readlink is one of the rare functions that write out a C string, but does never append a null to the output buffer(!)
// stringToUTF8() always appends a null byte, so restore the character under the null byte after the write.
HEAP8[buf+len] = endChar;
return len;
},
__syscall_fchmodat2: (dirfd, path, mode, flags) => {
var nofollow = flags & {{{ cDefs.AT_SYMLINK_NOFOLLOW }}};
path = SYSCALLS.getStr(path);
path = SYSCALLS.calculateAt(dirfd, path);
FS.chmod(path, mode, nofollow);
return 0;
},
__syscall_faccessat: (dirfd, path, amode, flags) => {
#if SYSCALL_DEBUG
dbg('warning: untested syscall');
#endif
path = SYSCALLS.getStr(path);
#if ASSERTIONS
assert(flags === 0 || flags == {{{ cDefs.AT_EACCESS }}});
#endif
path = SYSCALLS.calculateAt(dirfd, path);
if (amode & ~{{{ cDefs.S_IRWXO }}}) {
// need a valid mode
return -{{{ cDefs.EINVAL }}};
}
var lookup = FS.lookupPath(path, { follow: true });
var node = lookup.node;
if (!node) {
return -{{{ cDefs.ENOENT }}};
}
var perms = '';
if (amode & {{{ cDefs.R_OK }}}) perms += 'r';
if (amode & {{{ cDefs.W_OK }}}) perms += 'w';
if (amode & {{{ cDefs.X_OK }}}) perms += 'x';
if (perms /* otherwise, they've just passed F_OK */ && FS.nodePermissions(node, perms)) {
return -{{{ cDefs.EACCES }}};
}
return 0;
},
__syscall_utimensat__deps: ['$readI53FromI64'],
__syscall_utimensat: (dirfd, path, times, flags) => {
path = SYSCALLS.getStr(path);
#if ASSERTIONS
assert(flags === 0);
#endif
path = SYSCALLS.calculateAt(dirfd, path, true);
var now = Date.now(), atime, mtime;
if (!times) {
atime = now;
mtime = now;
} else {
var seconds = {{{ makeGetValue('times', C_STRUCTS.timespec.tv_sec, 'i53') }}};
var nanoseconds = {{{ makeGetValue('times', C_STRUCTS.timespec.tv_nsec, 'i32') }}};
if (nanoseconds == {{{ cDefs.UTIME_NOW }}}) {
atime = now;
} else if (nanoseconds == {{{ cDefs.UTIME_OMIT }}}) {
atime = -1;
} else {
atime = (seconds*1000) + (nanoseconds/(1000*1000));
}
times += {{{ C_STRUCTS.timespec.__size__ }}};
seconds = {{{ makeGetValue('times', C_STRUCTS.timespec.tv_sec, 'i53') }}};
nanoseconds = {{{ makeGetValue('times', C_STRUCTS.timespec.tv_nsec, 'i32') }}};
if (nanoseconds == {{{ cDefs.UTIME_NOW }}}) {
mtime = now;
} else if (nanoseconds == {{{ cDefs.UTIME_OMIT }}}) {