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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 = {
$SYSCALLS__deps: ['$PATH',
#if FILESYSTEM && SYSCALLS_REQUIRE_FILESYSTEM
'$FS',
#endif
#if SYSCALL_DEBUG
'$ERRNO_MESSAGES'
#endif
],
$SYSCALLS: {
mappings: {},
#if SYSCALLS_REQUIRE_FILESYSTEM
// global constants
DEFAULT_POLLMASK: {{{ cDefine('POLLIN') }}} | {{{ cDefine('POLLOUT') }}},
// global state
umask: 0x1FF, // S_IRWXU | S_IRWXG | S_IRWXO
// shared utilities
calculateAt: function(dirfd, path) {
if (path[0] !== '/') {
// relative path
var dir;
if (dirfd === {{{ cDefine('AT_FDCWD') }}}) {
dir = FS.cwd();
} else {
var dirstream = FS.getStream(dirfd);
if (!dirstream) throw new FS.ErrnoError({{{ cDefine('EBADF') }}});
dir = dirstream.path;
}
path = PATH.join2(dir, path);
}
return path;
},
doStat: function(func, path, buf) {
try {
var stat = func(path);
} catch (e) {
if (e && e.node && PATH.normalize(path) !== PATH.normalize(FS.getPath(e.node))) {
// an error occurred while trying to look up the path; we should just report ENOTDIR
return -{{{ cDefine('ENOTDIR') }}};
}
throw e;
}
{{{ makeSetValue('buf', C_STRUCTS.stat.st_dev, 'stat.dev', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.__st_dev_padding, '0', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.__st_ino_truncated, 'stat.ino', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_mode, 'stat.mode', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_nlink, 'stat.nlink', 'i32') }}};
{{{ 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_rdev_padding, '0', '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') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_atim.tv_sec, '(stat.atime.getTime() / 1000)|0', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_atim.tv_nsec, '0', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_mtim.tv_sec, '(stat.mtime.getTime() / 1000)|0', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_mtim.tv_nsec, '0', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_ctim.tv_sec, '(stat.ctime.getTime() / 1000)|0', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_ctim.tv_nsec, '0', 'i32') }}};
{{{ makeSetValue('buf', C_STRUCTS.stat.st_ino, 'stat.ino', 'i64') }}};
return 0;
},
doMsync: function(addr, stream, len, flags, offset) {
var buffer = HEAPU8.slice(addr, addr + len);
FS.msync(stream, buffer, offset, len, flags);
},
doMkdir: function(path, mode) {
// 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;
},
doMknod: function(path, mode, dev) {
// we don't want this in the JS API as it uses mknod to create all nodes.
switch (mode & {{{ cDefine('S_IFMT') }}}) {
case {{{ cDefine('S_IFREG') }}}:
case {{{ cDefine('S_IFCHR') }}}:
case {{{ cDefine('S_IFBLK') }}}:
case {{{ cDefine('S_IFIFO') }}}:
case {{{ cDefine('S_IFSOCK') }}}:
break;
default: return -{{{ cDefine('EINVAL') }}};
}
FS.mknod(path, mode, dev);
return 0;
},
doReadlink: function(path, buf, bufsize) {
if (bufsize <= 0) return -{{{ cDefine('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;
},
doAccess: function(path, amode) {
if (amode & ~{{{ cDefine('S_IRWXO') }}}) {
// need a valid mode
return -{{{ cDefine('EINVAL') }}};
}
var node;
var lookup = FS.lookupPath(path, { follow: true });
node = lookup.node;
if (!node) {
return -{{{ cDefine('ENOENT') }}};
}
var perms = '';
if (amode & {{{ cDefine('R_OK') }}}) perms += 'r';
if (amode & {{{ cDefine('W_OK') }}}) perms += 'w';
if (amode & {{{ cDefine('X_OK') }}}) perms += 'x';
if (perms /* otherwise, they've just passed F_OK */ && FS.nodePermissions(node, perms)) {
return -{{{ cDefine('EACCES') }}};
}
return 0;
},
doDup: function(path, flags, suggestFD) {
var suggest = FS.getStream(suggestFD);
if (suggest) FS.close(suggest);
return FS.open(path, flags, 0, suggestFD, suggestFD).fd;
},
doReadv: function(stream, iov, iovcnt, offset) {
var ret = 0;
for (var i = 0; i < iovcnt; i++) {
var ptr = {{{ makeGetValue('iov', 'i*8', 'i32') }}};
var len = {{{ makeGetValue('iov', 'i*8 + 4', 'i32') }}};
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
}
return ret;
},
doWritev: function(stream, iov, iovcnt, offset) {
var ret = 0;
for (var i = 0; i < iovcnt; i++) {
var ptr = {{{ makeGetValue('iov', 'i*8', 'i32') }}};
var len = {{{ makeGetValue('iov', 'i*8 + 4', 'i32') }}};
var curr = FS.write(stream, {{{ heapAndOffset('HEAP8', 'ptr') }}}, len, offset);
if (curr < 0) return -1;
ret += curr;
}
return ret;
},
#else
// MEMFS filesystem disabled lite handling of stdout and stderr:
buffers: [null, [], []], // 1 => stdout, 2 => stderr
printChar: function(stream, curr) {
var buffer = SYSCALLS.buffers[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
// arguments handling
varargs: undefined,
get: function() {
#if ASSERTIONS
assert(SYSCALLS.varargs != undefined);
#endif
SYSCALLS.varargs += 4;
var ret = {{{ makeGetValue('SYSCALLS.varargs', '-4', 'i32') }}};
#if SYSCALL_DEBUG
err(' (raw: "' + ret + '")');
#endif
return ret;
},
getStr: function(ptr) {
var ret = UTF8ToString(ptr);
#if SYSCALL_DEBUG
err(' (str: "' + ret + '")');
#endif
return ret;
},
#if SYSCALLS_REQUIRE_FILESYSTEM
getStreamFromFD: function(fd) {
var stream = FS.getStream(fd);
if (!stream) throw new FS.ErrnoError({{{ cDefine('EBADF') }}});
#if SYSCALL_DEBUG
err(' (stream: "' + stream.path + '")');
#endif
return stream;
},
#endif // SYSCALLS_REQUIRE_FILESYSTEM
get64: function(low, high) {
#if ASSERTIONS
if (low >= 0) assert(high === 0);
else assert(high === -1);
#endif
#if SYSCALL_DEBUG
err(' (i64: "' + low + '")');
#endif
return low;
}
},
$syscallMmap2__deps: ['$SYSCALLS',
#if FILESYSTEM && SYSCALLS_REQUIRE_FILESYSTEM
'$FS',
#endif
],
$syscallMmap2: function(addr, len, prot, flags, fd, off) {
off <<= 12; // undo pgoffset
var ptr;
var allocated = false;
// addr argument must be page aligned if MAP_FIXED flag is set.
if ((flags & {{{ cDefine('MAP_FIXED') }}}) !== 0 && (addr % {{{ POSIX_PAGE_SIZE }}}) !== 0) {
return -{{{ cDefine('EINVAL') }}};
}
// MAP_ANONYMOUS (aka MAP_ANON) isn't actually defined by POSIX spec,
// but it is widely used way to allocate memory pages on Linux, BSD and Mac.
// In this case fd argument is ignored.
if ((flags & {{{ cDefine('MAP_ANONYMOUS') }}}) !== 0) {
ptr = _memalign({{{ POSIX_PAGE_SIZE }}}, len);
if (!ptr) return -{{{ cDefine('ENOMEM') }}};
_memset(ptr, 0, len);
allocated = true;
} else {
#if FILESYSTEM && SYSCALLS_REQUIRE_FILESYSTEM
var info = FS.getStream(fd);
if (!info) return -{{{ cDefine('EBADF') }}};
var res = FS.mmap(info, addr, len, off, prot, flags);
ptr = res.ptr;
allocated = res.allocated;
#else // no filesystem support; report lack of support
return -{{{ cDefine('ENOSYS') }}};
#endif
}
#if CAN_ADDRESS_2GB
ptr >>>= 0;
#endif
SYSCALLS.mappings[ptr] = { malloc: ptr, len: len, allocated: allocated, fd: fd, prot: prot, flags: flags, offset: off };
return ptr;
},
$syscallMunmap__deps: ['$SYSCALLS',
#if FILESYSTEM && SYSCALLS_REQUIRE_FILESYSTEM
'$FS',
#endif
],
$syscallMunmap: function(addr, len) {
#if CAN_ADDRESS_2GB
addr >>>= 0;
#endif
if ((addr | 0) === {{{ cDefine('MAP_FAILED') }}} || len === 0) {
return -{{{ cDefine('EINVAL') }}};
}
// TODO: support unmmap'ing parts of allocations
var info = SYSCALLS.mappings[addr];
if (!info) return 0;
if (len === info.len) {
#if FILESYSTEM && SYSCALLS_REQUIRE_FILESYSTEM
var stream = FS.getStream(info.fd);
if (info.prot & {{{ cDefine('PROT_WRITE') }}}) {
SYSCALLS.doMsync(addr, stream, len, info.flags, info.offset);
}
FS.munmap(stream);
#else
#if ASSERTIONS
// Without FS support, only anonymous mappings are supported.
assert(SYSCALLS.mappings[addr].flags & {{{ cDefine('MAP_ANONYMOUS') }}});
#endif
#endif
SYSCALLS.mappings[addr] = null;
if (info.allocated) {
_free(info.malloc);
}
}
return 0;
},
__sys_exit: function(status) {
exit(status);
// no return
},
__sys_read: function(fd, buf, count) {
var stream = SYSCALLS.getStreamFromFD(fd);
return FS.read(stream, {{{ heapAndOffset('HEAP8', 'buf') }}}, count);
},
__sys_write: function(fd, buf, count) {
#if SYSCALLS_REQUIRE_FILESYSTEM
var stream = SYSCALLS.getStreamFromFD(fd);
return FS.write(stream, {{{ heapAndOffset('HEAP8', 'buf') }}}, count);
#else
// hack to support printf in SYSCALLS_REQUIRE_FILESYSTEM=0
for (var i = 0; i < count; i++) {
SYSCALLS.printChar(fd, HEAPU8[buf+i]);
}
return count;
#endif // SYSCALLS_REQUIRE_FILESYSTEM
},
__sys_open: function(path, flags, varargs) {
var pathname = SYSCALLS.getStr(path);
var mode = SYSCALLS.get();
var stream = FS.open(pathname, flags, mode);
return stream.fd;
},
__sys_link__nothrow: true,
__sys_link__proxy: false,
__sys_link: function(oldpath, newpath) {
return -{{{ cDefine('EMLINK') }}}; // no hardlinks for us
},
__sys_unlink: function(path) {
path = SYSCALLS.getStr(path);
FS.unlink(path);
return 0;
},
__sys_chdir: function(path) {
path = SYSCALLS.getStr(path);
FS.chdir(path);
return 0;
},
__sys_mknod: function(path, mode, dev) {
path = SYSCALLS.getStr(path);
return SYSCALLS.doMknod(path, mode, dev);
},
__sys_chmod: function(path, mode) {
path = SYSCALLS.getStr(path);
FS.chmod(path, mode);
return 0;
},
__sys_getpid__nothrow: true,
__sys_getpid__proxy: false,
__sys_getpid: function() {
return {{{ PROCINFO.pid }}};
},
__sys_pause__nothrow: true,
__sys_pause__proxy: false,
__sys_pause: function() {
return -{{{ cDefine('EINTR') }}}; // we can't pause
},
__sys_access: function(path, amode) {
path = SYSCALLS.getStr(path);
return SYSCALLS.doAccess(path, amode);
},
__sys_nice__nothrow: true,
__sys_nice__proxy: false,
__sys_nice: function(inc) {
return -{{{ cDefine('EPERM') }}}; // no meaning to nice for our single-process environment
},
__sys_sync__proxy: false,
__sys_sync__nothrow: true,
__sys_sync: function() {
return 0;
},
__sys_rename: function(old_path, new_path) {
old_path = SYSCALLS.getStr(old_path);
new_path = SYSCALLS.getStr(new_path);
FS.rename(old_path, new_path);
return 0;
},
__sys_mkdir: function(path, mode) {
path = SYSCALLS.getStr(path);
return SYSCALLS.doMkdir(path, mode);
},
__sys_rmdir: function(path) {
path = SYSCALLS.getStr(path);
FS.rmdir(path);
return 0;
},
__sys_dup: function(fd) {
var old = SYSCALLS.getStreamFromFD(fd);
return FS.open(old.path, old.flags, 0).fd;
},
__sys_pipe__deps: ['$PIPEFS'],
__sys_pipe: function(fdPtr) {
if (fdPtr == 0) {
throw new FS.ErrnoError({{{ cDefine('EFAULT') }}});
}
var res = PIPEFS.createPipe();
{{{ makeSetValue('fdPtr', 0, 'res.readable_fd', 'i32') }}};
{{{ makeSetValue('fdPtr', 4, 'res.writable_fd', 'i32') }}};
return 0;
},
__sys_acct__nothrow: true,
__sys_acct__proxy: false,
__sys_acct: function(filename) {
return -{{{ cDefine('ENOSYS') }}}; // unsupported features
},
__sys_ioctl: function(fd, op, varargs) {
#if SYSCALLS_REQUIRE_FILESYSTEM == 0
#if SYSCALL_DEBUG
err('no-op in ioctl syscall due to SYSCALLS_REQUIRE_FILESYSTEM=0');
#endif
return 0;
#else
var stream = SYSCALLS.getStreamFromFD(fd);
switch (op) {
case {{{ cDefine('TCGETA') }}}:
case {{{ cDefine('TCGETS') }}}: {
if (!stream.tty) return -{{{ cDefine('ENOTTY') }}};
#if SYSCALL_DEBUG
err('warning: not filling tio struct');
#endif
return 0;
}
case {{{ cDefine('TCSETA') }}}:
case {{{ cDefine('TCSETAW') }}}:
case {{{ cDefine('TCSETAF') }}}:
case {{{ cDefine('TCSETS') }}}:
case {{{ cDefine('TCSETSW') }}}:
case {{{ cDefine('TCSETSF') }}}: {
if (!stream.tty) return -{{{ cDefine('ENOTTY') }}};
return 0; // no-op, not actually adjusting terminal settings
}
case {{{ cDefine('TIOCGPGRP') }}}: {
if (!stream.tty) return -{{{ cDefine('ENOTTY') }}};
var argp = SYSCALLS.get();
{{{ makeSetValue('argp', 0, 0, 'i32') }}};
return 0;
}
case {{{ cDefine('TIOCSPGRP') }}}: {
if (!stream.tty) return -{{{ cDefine('ENOTTY') }}};
return -{{{ cDefine('EINVAL') }}}; // not supported
}
case {{{ cDefine('FIONREAD') }}}: {
var argp = SYSCALLS.get();
return FS.ioctl(stream, op, argp);
}
case {{{ cDefine('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 -{{{ cDefine('ENOTTY') }}};
return 0;
}
case {{{ cDefine('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 -{{{ cDefine('ENOTTY') }}};
return 0;
}
default: abort('bad ioctl syscall ' + op);
}
#endif // SYSCALLS_REQUIRE_FILESYSTEM
},
__sys_setpgid__nothrow: true,
__sys_setpgid__proxy: false,
__sys_setpgid: function(pid, pgid) {
if (pid && pid !== {{{ PROCINFO.pid }}}) return -{{{ cDefine('ESRCH') }}};
if (pgid && pgid !== {{{ PROCINFO.pgid }}}) return -{{{ cDefine('EPERM') }}};
return 0;
},
__sys_umask: function(mask) {
var old = SYSCALLS.umask;
SYSCALLS.umask = mask;
return old;
},
__sys_dup2: function(oldfd, suggestFD) {
var old = SYSCALLS.getStreamFromFD(oldfd);
if (old.fd === suggestFD) return suggestFD;
return SYSCALLS.doDup(old.path, old.flags, suggestFD);
},
__sys_getppid__nothrow: true,
__sys_getppid__proxy: false,
__sys_getppid: function() {
return {{{ PROCINFO.ppid }}};
},
__sys_getpgrp__nothrow: true,
__sys_getpgrp__proxy: false,
__sys_getpgrp: function() {
return {{{ PROCINFO.pgid }}};
},
__sys_setsid__nothrow: true,
__sys_setsid__proxy: false,
__sys_setsid: function() {
return 0; // no-op
},
__sys_setrlimit__nothrow: true,
__sys_setrlimit__proxy: false,
__sys_setrlimit: function(varargs) {
return 0; // no-op
},
__sys_getrusage: function(who, usage) {
#if SYSCALL_DEBUG
err('warning: untested syscall');
#endif
_memset(usage, 0, {{{ C_STRUCTS.rusage.__size__ }}});
{{{ makeSetValue('usage', C_STRUCTS.rusage.ru_utime.tv_sec, '1', 'i32') }}}; // fake some values
{{{ makeSetValue('usage', C_STRUCTS.rusage.ru_utime.tv_usec, '2', 'i32') }}};
{{{ makeSetValue('usage', C_STRUCTS.rusage.ru_stime.tv_sec, '3', 'i32') }}};
{{{ makeSetValue('usage', C_STRUCTS.rusage.ru_stime.tv_usec, '4', 'i32') }}};
return 0;
},
__sys_symlink: function(target, linkpath) {
target = SYSCALLS.getStr(target);
linkpath = SYSCALLS.getStr(linkpath);
FS.symlink(target, linkpath);
return 0;
},
__sys_readlink: function(path, buf, bufsize) {
path = SYSCALLS.getStr(path);
return SYSCALLS.doReadlink(path, buf, bufsize);
},
__sys_munmap__deps: ['$syscallMunmap'],
__sys_munmap: function(addr, len) {
return syscallMunmap(addr, len);
},
__sys_fchmod: function(fd, mode) {
FS.fchmod(fd, mode);
return 0;
},
__sys_getpriority__nothrow: true,
__sys_getpriority__proxy: false,
__sys_getpriority: function() {
return 0;
},
__sys_setpriority__nothrow: true,
__sys_setpriority__proxy: false,
__sys_setpriority: function() {
return -{{{ cDefine('EPERM') }}};
},
#if PROXY_POSIX_SOCKETS == 0
__sys_socketcall__deps: ['$SOCKFS', '$DNS', '_read_sockaddr', '_write_sockaddr'],
__sys_socketcall: function(call, socketvararg) {
#if SYSCALL_DEBUG
err(' (socketcall begin: "' + call + '")');
#endif
// socketcalls pass the rest of the arguments in a struct
SYSCALLS.varargs = socketvararg;
var getSocketFromFD = function() {
var socket = SOCKFS.getSocket(SYSCALLS.get());
if (!socket) throw new FS.ErrnoError({{{ cDefine('EBADF') }}});
#if SYSCALL_DEBUG
err(' (socket: "' + socket.path + '")');
#endif
return socket;
};
/** @param {boolean=} allowNull */
var getSocketAddress = function(allowNull) {
var addrp = SYSCALLS.get(), addrlen = SYSCALLS.get();
if (allowNull && addrp === 0) return null;
var info = __read_sockaddr(addrp, addrlen);
if (info.errno) throw new FS.ErrnoError(info.errno);
info.addr = DNS.lookup_addr(info.addr) || info.addr;
#if SYSCALL_DEBUG
err(' (socketaddress: "' + [info.addr, info.port] + '")');
#endif
return info;
};
switch (call) {
case 1: { // socket
var domain = SYSCALLS.get(), type = SYSCALLS.get(), protocol = SYSCALLS.get();
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;
}
case 2: { // bind
var sock = getSocketFromFD(), info = getSocketAddress();
sock.sock_ops.bind(sock, info.addr, info.port);
return 0;
}
case 3: { // connect
var sock = getSocketFromFD(), info = getSocketAddress();
sock.sock_ops.connect(sock, info.addr, info.port);
return 0;
}
case 4: { // listen
var sock = getSocketFromFD(), backlog = SYSCALLS.get();
sock.sock_ops.listen(sock, backlog);
return 0;
}
case 5: { // accept
var sock = getSocketFromFD(), addr = SYSCALLS.get(), addrlen = SYSCALLS.get();
var newsock = sock.sock_ops.accept(sock);
if (addr) {
var res = __write_sockaddr(addr, newsock.family, DNS.lookup_name(newsock.daddr), newsock.dport);
#if ASSERTIONS
assert(!res.errno);
#endif
}
return newsock.stream.fd;
}
case 6: { // getsockname
var sock = getSocketFromFD(), addr = SYSCALLS.get(), addrlen = SYSCALLS.get();
// TODO: sock.saddr should never be undefined, see TODO in websocket_sock_ops.getname
var res = __write_sockaddr(addr, sock.family, DNS.lookup_name(sock.saddr || '0.0.0.0'), sock.sport);
#if ASSERTIONS
assert(!res.errno);
#endif
return 0;
}
case 7: { // getpeername
var sock = getSocketFromFD(), addr = SYSCALLS.get(), addrlen = SYSCALLS.get();
if (!sock.daddr) {
return -{{{ cDefine('ENOTCONN') }}}; // The socket is not connected.
}
var res = __write_sockaddr(addr, sock.family, DNS.lookup_name(sock.daddr), sock.dport);
#if ASSERTIONS
assert(!res.errno);
#endif
return 0;
}
case 11: { // sendto
var sock = getSocketFromFD(), message = SYSCALLS.get(), length = SYSCALLS.get(), flags = SYSCALLS.get(), dest = getSocketAddress(true);
if (!dest) {
// send, no address provided
return FS.write(sock.stream, {{{ heapAndOffset('HEAP8', 'message') }}}, length);
} else {
// sendto an address
return sock.sock_ops.sendmsg(sock, {{{ heapAndOffset('HEAP8', 'message') }}}, length, dest.addr, dest.port);
}
}
case 12: { // recvfrom
var sock = getSocketFromFD(), buf = SYSCALLS.get(), len = SYSCALLS.get(), flags = SYSCALLS.get(), addr = SYSCALLS.get(), addrlen = SYSCALLS.get();
var msg = sock.sock_ops.recvmsg(sock, len);
if (!msg) return 0; // socket is closed
if (addr) {
var res = __write_sockaddr(addr, sock.family, DNS.lookup_name(msg.addr), msg.port);
#if ASSERTIONS
assert(!res.errno);
#endif
}
HEAPU8.set(msg.buffer, buf);
return msg.buffer.byteLength;
}
case 14: { // setsockopt
return -{{{ cDefine('ENOPROTOOPT') }}}; // The option is unknown at the level indicated.
}
case 15: { // getsockopt
var sock = getSocketFromFD(), level = SYSCALLS.get(), optname = SYSCALLS.get(), optval = SYSCALLS.get(), optlen = SYSCALLS.get();
// Minimal getsockopt aimed at resolving https://github.com/emscripten-core/emscripten/issues/2211
// so only supports SOL_SOCKET with SO_ERROR.
if (level === {{{ cDefine('SOL_SOCKET') }}}) {
if (optname === {{{ cDefine('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 -{{{ cDefine('ENOPROTOOPT') }}}; // The option is unknown at the level indicated.
}
case 16: { // sendmsg
var sock = getSocketFromFD(), message = SYSCALLS.get(), flags = SYSCALLS.get();
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 = __read_sockaddr(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, 'i8*') }}};
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);
}
case 17: { // recvmsg
var sock = getSocketFromFD(), message = SYSCALLS.get(), flags = SYSCALLS.get();
var iov = {{{ makeGetValue('message', C_STRUCTS.msghdr.msg_iov, 'i8*') }}};
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 res = __write_sockaddr(name, sock.family, DNS.lookup_name(msg.addr), msg.port);
#if ASSERTIONS
assert(!res.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, 'i8*') }}};
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;
}
default: {
#if SYSCALL_DEBUG
err(' (socketcall unknown call: ' + call + ')');
#endif
return -{{{ cDefine('ENOSYS') }}}; // unsupported feature
}
}
},
#endif // ~PROXY_POSIX_SOCKETS==0
__sys_setitimer__nothrow: true,
__sys_setitimer__proxy: false,
__sys_setitimer: function(which, new_value, old_value) {
return -{{{ cDefine('ENOSYS') }}}; // unsupported feature
},
__sys_wait4__proxy: false,
__sys_wait4: function(pid, wstart, options, rusage) {
abort('cannot wait on child processes');
},
__sys_setdomainname__nothrow: true,
__sys_setdomainname__proxy: false,
__sys_setdomainname: function(name, size) {
return -{{{ cDefine('EPERM') }}};
},
#if MINIMAL_RUNTIME
__sys_uname__deps: ['$writeAsciiToMemory'],
#endif
__sys_uname__proxy: false,
__sys_uname: function(buf) {
if (!buf) return -{{{ cDefine('EFAULT') }}}
var layout = {{{ JSON.stringify(C_STRUCTS.utsname) }}};
var copyString = function(element, value) {
var offset = layout[element];
writeAsciiToMemory(value, buf + offset);
};
copyString('sysname', 'Emscripten');
copyString('nodename', 'emscripten');
copyString('release', '1.0');
copyString('version', '#1');
copyString('machine', 'x86-JS');
return 0;
},
__sys_mprotect__nothrow: true,
__sys_mprotect__proxy: false,
__sys_mprotect: function(addr, len, size) {
return 0; // let's not and say we did
},
__sys_getpgid__nothrow: true,
__sys_getpgid__proxy: false,
__sys_getpgid: function(pid) {
if (pid && pid !== {{{ PROCINFO.pid }}}) return -{{{ cDefine('ESRCH') }}};
return {{{ PROCINFO.pgid }}};
},
__sys_fchdir: function(fd) {
var stream = SYSCALLS.getStreamFromFD(fd);
FS.chdir(stream.path);
return 0;
},
__sys__newselect: function(nfds, readfds, writefds, exceptfds, timeout) {
// readfds are supported,
// writefds checks socket open status
// exceptfds not supported
// timeout is always 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
assert(!exceptfds, 'exceptfds not supported');
#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 = FS.getStream(fd);
if (!stream) throw new FS.ErrnoError({{{ cDefine('EBADF') }}});
var flags = SYSCALLS.DEFAULT_POLLMASK;
if (stream.stream_ops.poll) {
flags = stream.stream_ops.poll(stream);
}
if ((flags & {{{ cDefine('POLLIN') }}}) && check(fd, srcReadLow, srcReadHigh, mask)) {
fd < 32 ? (dstReadLow = dstReadLow | mask) : (dstReadHigh = dstReadHigh | mask);
total++;
}
if ((flags & {{{ cDefine('POLLOUT') }}}) && check(fd, srcWriteLow, srcWriteHigh, mask)) {
fd < 32 ? (dstWriteLow = dstWriteLow | mask) : (dstWriteHigh = dstWriteHigh | mask);
total++;
}
if ((flags & {{{ cDefine('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;
},
__sys_msync: function(addr, len, flags) {
#if CAN_ADDRESS_2GB
addr >>>= 0;
#endif
var info = SYSCALLS.mappings[addr];
if (!info) return 0;
SYSCALLS.doMsync(addr, FS.getStream(info.fd), len, info.flags, 0);
return 0;
},
__sys_getsid__nothrow: true,
__sys_getsid__proxy: false,
__sys_getsid: function(pid) {
if (pid && pid !== {{{ PROCINFO.pid }}}) return -{{{ cDefine('ESRCH') }}};
return {{{ PROCINFO.sid }}};
},
__sys_fdatasync: function(fd) {
var stream = SYSCALLS.getStreamFromFD(fd);
return 0; // we can't do anything synchronously; the in-memory FS is already synced to
},
__sys_mlock__nothrow: true,
__sys_mlock__proxy: false,
__sys_mlock__sig: 'iii',
__sys_mlock: function(addr, len) {
return 0;
},
__sys_munlock__nothrow: true,
__sys_munlock__proxy: false,
__sys_munlock__sig: 'iii',
__sys_munlock: function(addr, len) {
return 0;
},
__sys_mlockall__nothrow: true,
__sys_mlockall__proxy: false,
__sys_mlockall__sig: 'ii',
__sys_mlockall: function(flags) {
return 0;
},
__sys_munlockall__nothrow: true,
__sys_munlockall__proxy: false,
__sys_munlockall__sig: 'i',
__sys_munlockall: function() {
return 0;
},
__sys_mremap__nothrow: true,
__sys_mremap__proxy: false,
__sys_mremap: function(old_addr, old_size, new_size, flags) {
return -{{{ cDefine('ENOMEM') }}}; // never succeed
},
__sys_poll: function(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 = {{{ cDefine('POLLNVAL') }}};
var stream = FS.getStream(fd);
if (stream) {
mask = SYSCALLS.DEFAULT_POLLMASK;
if (stream.stream_ops.poll) {
mask = stream.stream_ops.poll(stream);
}
}
mask &= events | {{{ cDefine('POLLERR') }}} | {{{ cDefine('POLLHUP') }}};
if (mask) nonzero++;
{{{ makeSetValue('pollfd', C_STRUCTS.pollfd.revents, 'mask', 'i16') }}};
}
return nonzero;
},
__sys_rt_sigqueueinfo__nothrow: true,
__sys_rt_sigqueueinfo__proxy: false,
__sys_rt_sigqueueinfo: function(tgid, pid, uinfo) {
#if SYSCALL_DEBUG
err('warning: ignoring SYS_rt_sigqueueinfo');
#endif
return 0;
},
__sys_pread64: function(fd, buf, count, zero, low, high) {
var stream = SYSCALLS.getStreamFromFD(fd)
var offset = SYSCALLS.get64(low, high);
return FS.read(stream, {{{ heapAndOffset('HEAP8', 'buf') }}}, count, offset);
},
__sys_pwrite64: function(fd, buf, count, zero, low, high) {
var stream = SYSCALLS.getStreamFromFD(fd)
var offset = SYSCALLS.get64(low, high);
return FS.write(stream, {{{ heapAndOffset('HEAP8', 'buf') }}}, count, offset);
},
__sys_getcwd: function(buf, size) {
if (size === 0) return -{{{ cDefine('EINVAL') }}};
var cwd = FS.cwd();
var cwdLengthInBytes = lengthBytesUTF8(cwd);
if (size < cwdLengthInBytes + 1) return -{{{ cDefine('ERANGE') }}};
stringToUTF8(cwd, buf, size);
return buf;
},
__sys_ugetrlimit: function(resource, rlim) {
#if SYSCALL_DEBUG
err('warning: untested syscall');
#endif
{{{ makeSetValue('rlim', C_STRUCTS.rlimit.rlim_cur, '-1', 'i32') }}}; // RLIM_INFINITY
{{{ makeSetValue('rlim', C_STRUCTS.rlimit.rlim_cur + 4, '-1', 'i32') }}}; // RLIM_INFINITY
{{{ makeSetValue('rlim', C_STRUCTS.rlimit.rlim_max, '-1', 'i32') }}}; // RLIM_INFINITY
{{{ makeSetValue('rlim', C_STRUCTS.rlimit.rlim_max + 4, '-1', 'i32') }}}; // RLIM_INFINITY
return 0; // just report no limits
},
__sys_mmap2__deps: ['$syscallMmap2'],
__sys_mmap2: function(addr, len, prot, flags, fd, off) {
return syscallMmap2(addr, len, prot, flags, fd, off);
},