/**
 * POSIX.1 Issue 7 signal names accepted by synthetic `kill` / `ctx.bareOsSendSignal`
 * (delivery is logical; many only update guest state without host semantics).
 */
export const BARE_OS_POSIX_SIGNAL_NAMES = Object.freeze([
  'HUP',
  'INT',
  'QUIT',
  'ILL',
  'TRAP',
  'ABRT',
  'BUS',
  'FPE',
  'KILL',
  'USR1',
  'SEGV',
  'USR2',
  'PIPE',
  'ALRM',
  'TERM',
  'STKFLT',
  'CHLD',
  'CONT',
  'STOP',
  'TSTP',
  'TTIN',
  'TTOU',
  'URG',
  'XCPU',
  'XFSZ',
  'VTALRM',
  'PROF',
  'WINCH',
  'IO',
  'SYS'
])

/** @type {ReadonlySet<string>} */
const SET = new Set(BARE_OS_POSIX_SIGNAL_NAMES)

/**
 * @param {string} signal
 */
export function bareOsNormalizeSignalName(signal) {
  return String(signal || 'TERM')
    .replace(/^SIG/i, '')
    .toUpperCase()
}

/**
 * @param {string} signal
 */
export function bareOsIsPosixSignalName(signal) {
  const s = bareOsNormalizeSignalName(signal)
  return SET.has(s) || s === '0'
}