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'use strict';
// This file contains process bootstrappers that can only be
// run in the main thread
const {
ArrayIsArray,
} = primordials;
const {
errnoException,
codes: {
ERR_INVALID_ARG_TYPE,
ERR_UNKNOWN_CREDENTIAL
}
} = require('internal/errors');
const {
parseMode,
validateUint32,
validateString
} = require('internal/validators');
const { signals } = internalBinding('constants').os;
// The execution of this function itself should not cause any side effects.
function wrapProcessMethods(binding) {
// Cache the working directory to prevent lots of lookups. If the working
// directory is changed by `chdir`, it'll be updated.
let cachedCwd = '';
function chdir(directory) {
validateString(directory, 'directory');
binding.chdir(directory);
// Mark cache that it requires an update.
cachedCwd = '';
}
function umask(mask) {
if (mask !== undefined) {
mask = parseMode(mask, 'mask');
}
return binding.umask(mask);
}
function cwd() {
if (cachedCwd === '')
cachedCwd = binding.cwd();
return cachedCwd;
}
return {
chdir,
umask,
cwd
};
}
function wrapPosixCredentialSetters(credentials) {
const {
initgroups: _initgroups,
setgroups: _setgroups,
setegid: _setegid,
seteuid: _seteuid,
setgid: _setgid,
setuid: _setuid
} = credentials;
function initgroups(user, extraGroup) {
validateId(user, 'user');
validateId(extraGroup, 'extraGroup');
// Result is 0 on success, 1 if user is unknown, 2 if group is unknown.
const result = _initgroups(user, extraGroup);
if (result === 1) {
throw new ERR_UNKNOWN_CREDENTIAL('User', user);
} else if (result === 2) {
throw new ERR_UNKNOWN_CREDENTIAL('Group', extraGroup);
}
}
function setgroups(groups) {
if (!ArrayIsArray(groups)) {
throw new ERR_INVALID_ARG_TYPE('groups', 'Array', groups);
}
for (let i = 0; i < groups.length; i++) {
validateId(groups[i], `groups[${i}]`);
}
// Result is 0 on success. A positive integer indicates that the
// corresponding group was not found.
const result = _setgroups(groups);
if (result > 0) {
throw new ERR_UNKNOWN_CREDENTIAL('Group', groups[result - 1]);
}
}
function wrapIdSetter(type, method) {
return function(id) {
validateId(id, 'id');
// Result is 0 on success, 1 if credential is unknown.
const result = method(id);
if (result === 1) {
throw new ERR_UNKNOWN_CREDENTIAL(type, id);
}
};
}
function validateId(id, name) {
if (typeof id === 'number') {
validateUint32(id, name);
} else if (typeof id !== 'string') {
throw new ERR_INVALID_ARG_TYPE(name, ['number', 'string'], id);
}
}
return {
initgroups,
setgroups,
setegid: wrapIdSetter('Group', _setegid),
seteuid: wrapIdSetter('User', _seteuid),
setgid: wrapIdSetter('Group', _setgid),
setuid: wrapIdSetter('User', _setuid)
};
}
let Signal;
function isSignal(event) {
return typeof event === 'string' && signals[event] !== undefined;
}
// Worker threads don't receive signals.
function createSignalHandlers() {
const signalWraps = new Map();
// Detect presence of a listener for the special signal types
function startListeningIfSignal(type) {
if (isSignal(type) && !signalWraps.has(type)) {
if (Signal === undefined)
Signal = internalBinding('signal_wrap').Signal;
const wrap = new Signal();
wrap.unref();
wrap.onsignal = process.emit.bind(process, type, type);
const signum = signals[type];
const err = wrap.start(signum);
if (err) {
wrap.close();
throw errnoException(err, 'uv_signal_start');
}
signalWraps.set(type, wrap);
}
}
function stopListeningIfSignal(type) {
const wrap = signalWraps.get(type);
if (wrap !== undefined && process.listenerCount(type) === 0) {
wrap.close();
signalWraps.delete(type);
}
}
return {
startListeningIfSignal,
stopListeningIfSignal
};
}
module.exports = {
wrapProcessMethods,
createSignalHandlers,
wrapPosixCredentialSetters
};
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