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library_fs.js
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mergeInto(LibraryManager.library, {
$FS__deps: ['$ERRNO_CODES', '$ERRNO_MESSAGES', '__setErrNo', '$PATH', '$TTY', '$MEMFS', '$IDBFS', '$NODEFS', 'stdin', 'stdout', 'stderr', 'fflush'],
$FS__postset: 'FS.staticInit();' +
'__ATINIT__.unshift({ func: function() { if (!Module["noFSInit"] && !FS.init.initialized) FS.init() } });' +
'__ATMAIN__.push({ func: function() { FS.ignorePermissions = false } });' +
'__ATEXIT__.push({ func: function() { FS.quit() } });' +
// export some names through closure
'Module["FS_createFolder"] = FS.createFolder;' +
'Module["FS_createPath"] = FS.createPath;' +
'Module["FS_createDataFile"] = FS.createDataFile;' +
'Module["FS_createPreloadedFile"] = FS.createPreloadedFile;' +
'Module["FS_createLazyFile"] = FS.createLazyFile;' +
'Module["FS_createLink"] = FS.createLink;' +
'Module["FS_createDevice"] = FS.createDevice;',
$FS: {
root: null,
mounts: [],
devices: [null],
streams: [],
nextInode: 1,
nameTable: null,
currentPath: '/',
initialized: false,
// Whether we are currently ignoring permissions. Useful when preparing the
// filesystem and creating files inside read-only folders.
// This is set to false when the runtime is initialized, allowing you
// to modify the filesystem freely before run() is called.
ignorePermissions: true,
ErrnoError: null, // set during init
genericErrors: {},
handleFSError: function(e) {
if (!(e instanceof FS.ErrnoError)) throw e + ' : ' + stackTrace();
return ___setErrNo(e.errno);
},
//
// paths
//
lookupPath: function(path, opts) {
path = PATH.resolve(FS.cwd(), path);
opts = opts || {};
var defaults = {
follow_mount: true,
recurse_count: 0
};
for (var key in defaults) {
if (opts[key] === undefined) {
opts[key] = defaults[key];
}
}
if (opts.recurse_count > 8) { // max recursive lookup of 8
throw new FS.ErrnoError(ERRNO_CODES.ELOOP);
}
// split the path
var parts = PATH.normalizeArray(path.split('/').filter(function(p) {
return !!p;
}), false);
// start at the root
var current = FS.root;
var current_path = '/';
for (var i = 0; i < parts.length; i++) {
var islast = (i === parts.length-1);
if (islast && opts.parent) {
// stop resolving
break;
}
current = FS.lookupNode(current, parts[i]);
current_path = PATH.join2(current_path, parts[i]);
// jump to the mount's root node if this is a mountpoint
if (FS.isMountpoint(current)) {
if (!islast || (islast && opts.follow_mount)) {
current = current.mounted.root;
}
}
// by default, lookupPath will not follow a symlink if it is the final path component.
// setting opts.follow = true will override this behavior.
if (!islast || opts.follow) {
var count = 0;
while (FS.isLink(current.mode)) {
var link = FS.readlink(current_path);
current_path = PATH.resolve(PATH.dirname(current_path), link);
var lookup = FS.lookupPath(current_path, { recurse_count: opts.recurse_count });
current = lookup.node;
if (count++ > 40) { // limit max consecutive symlinks to 40 (SYMLOOP_MAX).
throw new FS.ErrnoError(ERRNO_CODES.ELOOP);
}
}
}
}
return { path: current_path, node: current };
},
getPath: function(node) {
var path;
while (true) {
if (FS.isRoot(node)) {
var mount = node.mount.mountpoint;
if (!path) return mount;
return mount[mount.length-1] !== '/' ? mount + '/' + path : mount + path;
}
path = path ? node.name + '/' + path : node.name;
node = node.parent;
}
},
//
// nodes
//
hashName: function(parentid, name) {
var hash = 0;
#if CASE_INSENSITIVE_FS
name = name.toLowerCase();
#endif
for (var i = 0; i < name.length; i++) {
hash = ((hash << 5) - hash + name.charCodeAt(i)) | 0;
}
return ((parentid + hash) >>> 0) % FS.nameTable.length;
},
hashAddNode: function(node) {
var hash = FS.hashName(node.parent.id, node.name);
node.name_next = FS.nameTable[hash];
FS.nameTable[hash] = node;
},
hashRemoveNode: function(node) {
var hash = FS.hashName(node.parent.id, node.name);
if (FS.nameTable[hash] === node) {
FS.nameTable[hash] = node.name_next;
} else {
var current = FS.nameTable[hash];
while (current) {
if (current.name_next === node) {
current.name_next = node.name_next;
break;
}
current = current.name_next;
}
}
},
lookupNode: function(parent, name) {
var err = FS.mayLookup(parent);
if (err) {
throw new FS.ErrnoError(err);
}
var hash = FS.hashName(parent.id, name);
#if CASE_INSENSITIVE_FS
name = name.toLowerCase();
#endif
for (var node = FS.nameTable[hash]; node; node = node.name_next) {
var nodeName = node.name;
#if CASE_INSENSITIVE_FS
nodeName = nodeName.toLowerCase();
#endif
if (node.parent.id === parent.id && nodeName === name) {
return node;
}
}
// if we failed to find it in the cache, call into the VFS
return FS.lookup(parent, name);
},
createNode: function(parent, name, mode, rdev) {
if (!FS.FSNode) {
FS.FSNode = function(parent, name, mode, rdev) {
if (!parent) {
parent = this; // root node sets parent to itself
}
this.parent = parent;
this.mount = parent.mount;
this.mounted = null;
this.id = FS.nextInode++;
this.name = name;
this.mode = mode;
this.node_ops = {};
this.stream_ops = {};
this.rdev = rdev;
};
FS.FSNode.prototype = {};
// compatibility
var readMode = {{{ cDefine('S_IRUGO') }}} | {{{ cDefine('S_IXUGO') }}};
var writeMode = {{{ cDefine('S_IWUGO') }}};
// NOTE we must use Object.defineProperties instead of individual calls to
// Object.defineProperty in order to make closure compiler happy
Object.defineProperties(FS.FSNode.prototype, {
read: {
get: function() { return (this.mode & readMode) === readMode; },
set: function(val) { val ? this.mode |= readMode : this.mode &= ~readMode; }
},
write: {
get: function() { return (this.mode & writeMode) === writeMode; },
set: function(val) { val ? this.mode |= writeMode : this.mode &= ~writeMode; }
},
isFolder: {
get: function() { return FS.isDir(this.mode); },
},
isDevice: {
get: function() { return FS.isChrdev(this.mode); },
},
});
}
var node = new FS.FSNode(parent, name, mode, rdev);
FS.hashAddNode(node);
return node;
},
destroyNode: function(node) {
FS.hashRemoveNode(node);
},
isRoot: function(node) {
return node === node.parent;
},
isMountpoint: function(node) {
return !!node.mounted;
},
isFile: function(mode) {
return (mode & {{{ cDefine('S_IFMT') }}}) === {{{ cDefine('S_IFREG') }}};
},
isDir: function(mode) {
return (mode & {{{ cDefine('S_IFMT') }}}) === {{{ cDefine('S_IFDIR') }}};
},
isLink: function(mode) {
return (mode & {{{ cDefine('S_IFMT') }}}) === {{{ cDefine('S_IFLNK') }}};
},
isChrdev: function(mode) {
return (mode & {{{ cDefine('S_IFMT') }}}) === {{{ cDefine('S_IFCHR') }}};
},
isBlkdev: function(mode) {
return (mode & {{{ cDefine('S_IFMT') }}}) === {{{ cDefine('S_IFBLK') }}};
},
isFIFO: function(mode) {
return (mode & {{{ cDefine('S_IFMT') }}}) === {{{ cDefine('S_IFIFO') }}};
},
isSocket: function(mode) {
return (mode & {{{ cDefine('S_IFSOCK') }}}) === {{{ cDefine('S_IFSOCK') }}};
},
//
// permissions
//
flagModes: {
'"r"': {{{ cDefine('O_RDONLY') }}},
'"rs"': {{{ cDefine('O_RDONLY') }}} | {{{ cDefine('O_SYNC') }}},
'"r+"': {{{ cDefine('O_RDWR') }}},
'"w"': {{{ cDefine('O_TRUNC') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_WRONLY') }}},
'"wx"': {{{ cDefine('O_TRUNC') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_WRONLY') }}} | {{{ cDefine('O_EXCL') }}},
'"xw"': {{{ cDefine('O_TRUNC') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_WRONLY') }}} | {{{ cDefine('O_EXCL') }}},
'"w+"': {{{ cDefine('O_TRUNC') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_RDWR') }}},
'"wx+"': {{{ cDefine('O_TRUNC') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_RDWR') }}} | {{{ cDefine('O_EXCL') }}},
'"xw+"': {{{ cDefine('O_TRUNC') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_RDWR') }}} | {{{ cDefine('O_EXCL') }}},
'"a"': {{{ cDefine('O_APPEND') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_WRONLY') }}},
'"ax"': {{{ cDefine('O_APPEND') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_WRONLY') }}} | {{{ cDefine('O_EXCL') }}},
'"xa"': {{{ cDefine('O_APPEND') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_WRONLY') }}} | {{{ cDefine('O_EXCL') }}},
'"a+"': {{{ cDefine('O_APPEND') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_RDWR') }}},
'"ax+"': {{{ cDefine('O_APPEND') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_RDWR') }}} | {{{ cDefine('O_EXCL') }}},
'"xa+"': {{{ cDefine('O_APPEND') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_RDWR') }}} | {{{ cDefine('O_EXCL') }}}
},
// convert the 'r', 'r+', etc. to it's corresponding set of O_* flags
modeStringToFlags: function(str) {
var flags = FS.flagModes[str];
if (typeof flags === 'undefined') {
throw new Error('Unknown file open mode: ' + str);
}
return flags;
},
// convert O_* bitmask to a string for nodePermissions
flagsToPermissionString: function(flag) {
var accmode = flag & {{{ cDefine('O_ACCMODE') }}};
var perms = ['r', 'w', 'rw'][accmode];
if ((flag & {{{ cDefine('O_TRUNC') }}})) {
perms += 'w';
}
return perms;
},
nodePermissions: function(node, perms) {
if (FS.ignorePermissions) {
return 0;
}
// return 0 if any user, group or owner bits are set.
if (perms.indexOf('r') !== -1 && !(node.mode & {{{ cDefine('S_IRUGO') }}})) {
return ERRNO_CODES.EACCES;
} else if (perms.indexOf('w') !== -1 && !(node.mode & {{{ cDefine('S_IWUGO') }}})) {
return ERRNO_CODES.EACCES;
} else if (perms.indexOf('x') !== -1 && !(node.mode & {{{ cDefine('S_IXUGO') }}})) {
return ERRNO_CODES.EACCES;
}
return 0;
},
mayLookup: function(dir) {
return FS.nodePermissions(dir, 'x');
},
mayCreate: function(dir, name) {
try {
var node = FS.lookupNode(dir, name);
return ERRNO_CODES.EEXIST;
} catch (e) {
}
return FS.nodePermissions(dir, 'wx');
},
mayDelete: function(dir, name, isdir) {
var node;
try {
node = FS.lookupNode(dir, name);
} catch (e) {
return e.errno;
}
var err = FS.nodePermissions(dir, 'wx');
if (err) {
return err;
}
if (isdir) {
if (!FS.isDir(node.mode)) {
return ERRNO_CODES.ENOTDIR;
}
if (FS.isRoot(node) || FS.getPath(node) === FS.cwd()) {
return ERRNO_CODES.EBUSY;
}
} else {
if (FS.isDir(node.mode)) {
return ERRNO_CODES.EISDIR;
}
}
return 0;
},
mayOpen: function(node, flags) {
if (!node) {
return ERRNO_CODES.ENOENT;
}
if (FS.isLink(node.mode)) {
return ERRNO_CODES.ELOOP;
} else if (FS.isDir(node.mode)) {
if ((flags & {{{ cDefine('O_ACCMODE') }}}) !== {{{ cDefine('O_RDONLY')}}} || // opening for write
(flags & {{{ cDefine('O_TRUNC') }}})) {
return ERRNO_CODES.EISDIR;
}
}
return FS.nodePermissions(node, FS.flagsToPermissionString(flags));
},
//
// streams
//
MAX_OPEN_FDS: 4096,
nextfd: function(fd_start, fd_end) {
fd_start = fd_start || 0;
fd_end = fd_end || FS.MAX_OPEN_FDS;
for (var fd = fd_start; fd <= fd_end; fd++) {
if (!FS.streams[fd]) {
return fd;
}
}
throw new FS.ErrnoError(ERRNO_CODES.EMFILE);
},
getStream: function(fd) {
return FS.streams[fd];
},
// TODO parameterize this function such that a stream
// object isn't directly passed in. not possible until
// SOCKFS is completed.
createStream: function(stream, fd_start, fd_end) {
if (!FS.FSStream) {
FS.FSStream = function(){};
FS.FSStream.prototype = {};
// compatibility
Object.defineProperties(FS.FSStream.prototype, {
object: {
get: function() { return this.node; },
set: function(val) { this.node = val; }
},
isRead: {
get: function() { return (this.flags & {{{ cDefine('O_ACCMODE') }}}) !== {{{ cDefine('O_WRONLY') }}}; }
},
isWrite: {
get: function() { return (this.flags & {{{ cDefine('O_ACCMODE') }}}) !== {{{ cDefine('O_RDONLY') }}}; }
},
isAppend: {
get: function() { return (this.flags & {{{ cDefine('O_APPEND') }}}); }
}
});
}
if (stream.__proto__) {
// reuse the object
stream.__proto__ = FS.FSStream.prototype;
} else {
var newStream = new FS.FSStream();
for (var p in stream) {
newStream[p] = stream[p];
}
stream = newStream;
}
var fd = FS.nextfd(fd_start, fd_end);
stream.fd = fd;
FS.streams[fd] = stream;
return stream;
},
closeStream: function(fd) {
FS.streams[fd] = null;
},
//
// file pointers
//
// instead of maintaining a separate mapping from FILE* to file descriptors,
// we employ a simple trick: the pointer to a stream is its fd plus 1. This
// means that all valid streams have a valid non-zero pointer while allowing
// the fs for stdin to be the standard value of zero.
//
//
getStreamFromPtr: function(ptr) {
return FS.streams[ptr - 1];
},
getPtrForStream: function(stream) {
return stream ? stream.fd + 1 : 0;
},
//
// devices
//
// each character device consists of a device id + stream operations.
// when a character device node is created (e.g. /dev/stdin) it is
// assigned a device id that lets us map back to the actual device.
// by default, each character device stream (e.g. _stdin) uses chrdev_stream_ops.
// however, once opened, the stream's operations are overridden with
// the operations of the device its underlying node maps back to.
chrdev_stream_ops: {
open: function(stream) {
var device = FS.getDevice(stream.node.rdev);
// override node's stream ops with the device's
stream.stream_ops = device.stream_ops;
// forward the open call
if (stream.stream_ops.open) {
stream.stream_ops.open(stream);
}
},
llseek: function() {
throw new FS.ErrnoError(ERRNO_CODES.ESPIPE);
}
},
major: function(dev) {
return ((dev) >> 8);
},
minor: function(dev) {
return ((dev) & 0xff);
},
makedev: function(ma, mi) {
return ((ma) << 8 | (mi));
},
registerDevice: function(dev, ops) {
FS.devices[dev] = { stream_ops: ops };
},
getDevice: function(dev) {
return FS.devices[dev];
},
//
// core
//
getMounts: function(mount) {
var mounts = [];
var check = [mount];
while (check.length) {
var m = check.pop();
mounts.push(m);
check.push.apply(check, m.mounts);
}
return mounts;
},
syncfs: function(populate, callback) {
if (typeof(populate) === 'function') {
callback = populate;
populate = false;
}
var mounts = FS.getMounts(FS.root.mount);
var completed = 0;
function done(err) {
if (err) {
if (!done.errored) {
done.errored = true;
return callback(err);
}
return;
}
if (++completed >= mounts.length) {
callback(null);
}
};
// sync all mounts
mounts.forEach(function (mount) {
if (!mount.type.syncfs) {
return done(null);
}
mount.type.syncfs(mount, populate, done);
});
},
mount: function(type, opts, mountpoint) {
var root = mountpoint === '/';
var pseudo = !mountpoint;
var node;
if (root && FS.root) {
throw new FS.ErrnoError(ERRNO_CODES.EBUSY);
} else if (!root && !pseudo) {
var lookup = FS.lookupPath(mountpoint, { follow_mount: false });
mountpoint = lookup.path; // use the absolute path
node = lookup.node;
if (FS.isMountpoint(node)) {
throw new FS.ErrnoError(ERRNO_CODES.EBUSY);
}
if (!FS.isDir(node.mode)) {
throw new FS.ErrnoError(ERRNO_CODES.ENOTDIR);
}
}
var mount = {
type: type,
opts: opts,
mountpoint: mountpoint,
mounts: []
};
// create a root node for the fs
var mountRoot = type.mount(mount);
mountRoot.mount = mount;
mount.root = mountRoot;
if (root) {
FS.root = mountRoot;
} else if (node) {
// set as a mountpoint
node.mounted = mount;
// add the new mount to the current mount's children
if (node.mount) {
node.mount.mounts.push(mount);
}
}
return mountRoot;
},
unmount: function (mountpoint) {
var lookup = FS.lookupPath(mountpoint, { follow_mount: false });
if (!FS.isMountpoint(lookup.node)) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
// destroy the nodes for this mount, and all its child mounts
var node = lookup.node;
var mount = node.mounted;
var mounts = FS.getMounts(mount);
Object.keys(FS.nameTable).forEach(function (hash) {
var current = FS.nameTable[hash];
while (current) {
var next = current.name_next;
if (mounts.indexOf(current.mount) !== -1) {
FS.destroyNode(current);
}
current = next;
}
});
// no longer a mountpoint
node.mounted = null;
// remove this mount from the child mounts
var idx = node.mount.mounts.indexOf(mount);
assert(idx !== -1);
node.mount.mounts.splice(idx, 1);
},
lookup: function(parent, name) {
return parent.node_ops.lookup(parent, name);
},
// generic function for all node creation
mknod: function(path, mode, dev) {
var lookup = FS.lookupPath(path, { parent: true });
var parent = lookup.node;
var name = PATH.basename(path);
var err = FS.mayCreate(parent, name);
if (err) {
throw new FS.ErrnoError(err);
}
if (!parent.node_ops.mknod) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
return parent.node_ops.mknod(parent, name, mode, dev);
},
// helpers to create specific types of nodes
create: function(path, mode) {
mode = mode !== undefined ? mode : 438 /* 0666 */;
mode &= {{{ cDefine('S_IALLUGO') }}};
mode |= {{{ cDefine('S_IFREG') }}};
return FS.mknod(path, mode, 0);
},
mkdir: function(path, mode) {
mode = mode !== undefined ? mode : 511 /* 0777 */;
mode &= {{{ cDefine('S_IRWXUGO') }}} | {{{ cDefine('S_ISVTX') }}};
mode |= {{{ cDefine('S_IFDIR') }}};
return FS.mknod(path, mode, 0);
},
mkdev: function(path, mode, dev) {
if (typeof(dev) === 'undefined') {
dev = mode;
mode = 438 /* 0666 */;
}
mode |= {{{ cDefine('S_IFCHR') }}};
return FS.mknod(path, mode, dev);
},
symlink: function(oldpath, newpath) {
var lookup = FS.lookupPath(newpath, { parent: true });
var parent = lookup.node;
var newname = PATH.basename(newpath);
var err = FS.mayCreate(parent, newname);
if (err) {
throw new FS.ErrnoError(err);
}
if (!parent.node_ops.symlink) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
return parent.node_ops.symlink(parent, newname, oldpath);
},
rename: function(old_path, new_path) {
var old_dirname = PATH.dirname(old_path);
var new_dirname = PATH.dirname(new_path);
var old_name = PATH.basename(old_path);
var new_name = PATH.basename(new_path);
// parents must exist
var lookup, old_dir, new_dir;
try {
lookup = FS.lookupPath(old_path, { parent: true });
old_dir = lookup.node;
lookup = FS.lookupPath(new_path, { parent: true });
new_dir = lookup.node;
} catch (e) {
throw new FS.ErrnoError(ERRNO_CODES.EBUSY);
}
// need to be part of the same mount
if (old_dir.mount !== new_dir.mount) {
throw new FS.ErrnoError(ERRNO_CODES.EXDEV);
}
// source must exist
var old_node = FS.lookupNode(old_dir, old_name);
// old path should not be an ancestor of the new path
var relative = PATH.relative(old_path, new_dirname);
if (relative.charAt(0) !== '.') {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
// new path should not be an ancestor of the old path
relative = PATH.relative(new_path, old_dirname);
if (relative.charAt(0) !== '.') {
throw new FS.ErrnoError(ERRNO_CODES.ENOTEMPTY);
}
// see if the new path already exists
var new_node;
try {
new_node = FS.lookupNode(new_dir, new_name);
} catch (e) {
// not fatal
}
// early out if nothing needs to change
if (old_node === new_node) {
return;
}
// we'll need to delete the old entry
var isdir = FS.isDir(old_node.mode);
var err = FS.mayDelete(old_dir, old_name, isdir);
if (err) {
throw new FS.ErrnoError(err);
}
// need delete permissions if we'll be overwriting.
// need create permissions if new doesn't already exist.
err = new_node ?
FS.mayDelete(new_dir, new_name, isdir) :
FS.mayCreate(new_dir, new_name);
if (err) {
throw new FS.ErrnoError(err);
}
if (!old_dir.node_ops.rename) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
if (FS.isMountpoint(old_node) || (new_node && FS.isMountpoint(new_node))) {
throw new FS.ErrnoError(ERRNO_CODES.EBUSY);
}
// if we are going to change the parent, check write permissions
if (new_dir !== old_dir) {
err = FS.nodePermissions(old_dir, 'w');
if (err) {
throw new FS.ErrnoError(err);
}
}
// remove the node from the lookup hash
FS.hashRemoveNode(old_node);
// do the underlying fs rename
try {
old_dir.node_ops.rename(old_node, new_dir, new_name);
} catch (e) {
throw e;
} finally {
// add the node back to the hash (in case node_ops.rename
// changed its name)
FS.hashAddNode(old_node);
}
},
rmdir: function(path) {
var lookup = FS.lookupPath(path, { parent: true });
var parent = lookup.node;
var name = PATH.basename(path);
var node = FS.lookupNode(parent, name);
var err = FS.mayDelete(parent, name, true);
if (err) {
throw new FS.ErrnoError(err);
}
if (!parent.node_ops.rmdir) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
if (FS.isMountpoint(node)) {
throw new FS.ErrnoError(ERRNO_CODES.EBUSY);
}
parent.node_ops.rmdir(parent, name);
FS.destroyNode(node);
},
readdir: function(path) {
var lookup = FS.lookupPath(path, { follow: true });
var node = lookup.node;
if (!node.node_ops.readdir) {
throw new FS.ErrnoError(ERRNO_CODES.ENOTDIR);
}
return node.node_ops.readdir(node);
},
unlink: function(path) {
var lookup = FS.lookupPath(path, { parent: true });
var parent = lookup.node;
var name = PATH.basename(path);
var node = FS.lookupNode(parent, name);
var err = FS.mayDelete(parent, name, false);
if (err) {
// POSIX says unlink should set EPERM, not EISDIR
if (err === ERRNO_CODES.EISDIR) err = ERRNO_CODES.EPERM;
throw new FS.ErrnoError(err);
}
if (!parent.node_ops.unlink) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
if (FS.isMountpoint(node)) {
throw new FS.ErrnoError(ERRNO_CODES.EBUSY);
}
parent.node_ops.unlink(parent, name);
FS.destroyNode(node);
},
readlink: function(path) {
var lookup = FS.lookupPath(path);
var link = lookup.node;
if (!link.node_ops.readlink) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
return link.node_ops.readlink(link);
},
stat: function(path, dontFollow) {
var lookup = FS.lookupPath(path, { follow: !dontFollow });
var node = lookup.node;
if (!node.node_ops.getattr) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
return node.node_ops.getattr(node);
},
lstat: function(path) {
return FS.stat(path, true);
},
chmod: function(path, mode, dontFollow) {
var node;
if (typeof path === 'string') {
var lookup = FS.lookupPath(path, { follow: !dontFollow });
node = lookup.node;
} else {
node = path;
}
if (!node.node_ops.setattr) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
node.node_ops.setattr(node, {
mode: (mode & {{{ cDefine('S_IALLUGO') }}}) | (node.mode & ~{{{ cDefine('S_IALLUGO') }}}),
timestamp: Date.now()
});
},
lchmod: function(path, mode) {
FS.chmod(path, mode, true);
},
fchmod: function(fd, mode) {
var stream = FS.getStream(fd);
if (!stream) {
throw new FS.ErrnoError(ERRNO_CODES.EBADF);
}
FS.chmod(stream.node, mode);
},
chown: function(path, uid, gid, dontFollow) {
var node;
if (typeof path === 'string') {
var lookup = FS.lookupPath(path, { follow: !dontFollow });
node = lookup.node;
} else {
node = path;
}
if (!node.node_ops.setattr) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
node.node_ops.setattr(node, {
timestamp: Date.now()
// we ignore the uid / gid for now
});
},
lchown: function(path, uid, gid) {
FS.chown(path, uid, gid, true);
},
fchown: function(fd, uid, gid) {
var stream = FS.getStream(fd);
if (!stream) {
throw new FS.ErrnoError(ERRNO_CODES.EBADF);
}
FS.chown(stream.node, uid, gid);
},
truncate: function(path, len) {
if (len < 0) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
var node;
if (typeof path === 'string') {
var lookup = FS.lookupPath(path, { follow: true });
node = lookup.node;
} else {
node = path;
}
if (!node.node_ops.setattr) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
if (FS.isDir(node.mode)) {
throw new FS.ErrnoError(ERRNO_CODES.EISDIR);
}
if (!FS.isFile(node.mode)) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
var err = FS.nodePermissions(node, 'w');
if (err) {
throw new FS.ErrnoError(err);
}
node.node_ops.setattr(node, {
size: len,
timestamp: Date.now()
});
},
ftruncate: function(fd, len) {
var stream = FS.getStream(fd);
if (!stream) {
throw new FS.ErrnoError(ERRNO_CODES.EBADF);
}
if ((stream.flags & {{{ cDefine('O_ACCMODE') }}}) === {{{ cDefine('O_RDONLY')}}}) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
FS.truncate(stream.node, len);
},
utime: function(path, atime, mtime) {
var lookup = FS.lookupPath(path, { follow: true });
var node = lookup.node;
node.node_ops.setattr(node, {
timestamp: Math.max(atime, mtime)
});
},
open: function(path, flags, mode, fd_start, fd_end) {
flags = typeof flags === 'string' ? FS.modeStringToFlags(flags) : flags;
mode = typeof mode === 'undefined' ? 438 /* 0666 */ : mode;
if ((flags & {{{ cDefine('O_CREAT') }}})) {
mode = (mode & {{{ cDefine('S_IALLUGO') }}}) | {{{ cDefine('S_IFREG') }}};
} else {
mode = 0;
}
var node;
if (typeof path === 'object') {
node = path;
} else {
path = PATH.normalize(path);
try {
var lookup = FS.lookupPath(path, {
follow: !(flags & {{{ cDefine('O_NOFOLLOW') }}})
});
node = lookup.node;
} catch (e) {
// ignore
}
}
// perhaps we need to create the node
if ((flags & {{{ cDefine('O_CREAT') }}})) {
if (node) {
// if O_CREAT and O_EXCL are set, error out if the node already exists
if ((flags & {{{ cDefine('O_EXCL') }}})) {
throw new FS.ErrnoError(ERRNO_CODES.EEXIST);
}
} else {
// node doesn't exist, try to create it
node = FS.mknod(path, mode, 0);
}
}
if (!node) {
throw new FS.ErrnoError(ERRNO_CODES.ENOENT);
}
// can't truncate a device
if (FS.isChrdev(node.mode)) {
flags &= ~{{{ cDefine('O_TRUNC') }}};
}
// check permissions
var err = FS.mayOpen(node, flags);
if (err) {
throw new FS.ErrnoError(err);
}
// do truncation if necessary
if ((flags & {{{ cDefine('O_TRUNC')}}})) {
FS.truncate(node, 0);
}
// we've already handled these, don't pass down to the underlying vfs
flags &= ~({{{ cDefine('O_EXCL') }}} | {{{ cDefine('O_TRUNC') }}});
// register the stream with the filesystem
var stream = FS.createStream({
node: node,
path: FS.getPath(node), // we want the absolute path to the node
flags: flags,
seekable: true,
position: 0,
stream_ops: node.stream_ops,
// used by the file family libc calls (fopen, fwrite, ferror, etc.)
ungotten: [],
error: false
}, fd_start, fd_end);
// call the new stream's open function
if (stream.stream_ops.open) {
stream.stream_ops.open(stream);
}
if (Module['logReadFiles'] && !(flags & {{{ cDefine('O_WRONLY')}}})) {
if (!FS.readFiles) FS.readFiles = {};
if (!(path in FS.readFiles)) {
FS.readFiles[path] = 1;
Module['printErr']('read file: ' + path);
}
}
return stream;
},
close: function(stream) {
try {
if (stream.stream_ops.close) {
stream.stream_ops.close(stream);
}
} catch (e) {
throw e;
} finally {
FS.closeStream(stream.fd);
}
},
llseek: function(stream, offset, whence) {
if (!stream.seekable || !stream.stream_ops.llseek) {
throw new FS.ErrnoError(ERRNO_CODES.ESPIPE);
}
return stream.stream_ops.llseek(stream, offset, whence);
},
read: function(stream, buffer, offset, length, position) {
if (length < 0 || position < 0) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
if ((stream.flags & {{{ cDefine('O_ACCMODE') }}}) === {{{ cDefine('O_WRONLY')}}}) {
throw new FS.ErrnoError(ERRNO_CODES.EBADF);
}
if (FS.isDir(stream.node.mode)) {
throw new FS.ErrnoError(ERRNO_CODES.EISDIR);
}