fix: define all errno consts

Signed-off-by: Christian Stewart <[email protected]>

Author: paralin

gs/syscall/constants.ts

@@ -0,0 +1,29 @@
+// Essential syscall constants
+export const O_RDONLY = 0
+export const O_WRONLY = 1
+export const O_RDWR = 2
+export const O_APPEND = 8
+export const O_CREATE = 64
+export const O_EXCL = 128
+export const O_SYNC = 256
+export const O_TRUNC = 512
+
+export const Stdin = 0
+export const Stdout = 1
+export const Stderr = 2
+
+export const SIGINT = 2
+export const SIGTERM = 15
+
+// File mode constants
+export const S_IFMT = 0o170000
+export const S_IFREG = 0o100000
+export const S_IFDIR = 0o040000
+export const S_IFLNK = 0o120000
+export const S_IFBLK = 0o060000
+export const S_IFCHR = 0o020000
+export const S_IFIFO = 0o010000
+export const S_IFSOCK = 0o140000
+export const S_ISUID = 0o004000
+export const S_ISGID = 0o002000
+export const S_ISVTX = 0o001000 

gs/syscall/env.ts

@@ -0,0 +1,47 @@
+import * as $ from '@goscript/builtin/index.js'
+
+// Environment variable functions using Node.js/browser APIs
+export function Getenv(key: string): [string, boolean] {
+  if (typeof process !== 'undefined' && process.env) {
+    const value = process.env[key]
+    return value !== undefined ? [value, true] : ['', false]
+  }
+  return ['', false]
+}
+
+export function Setenv(key: string, value: string): $.GoError {
+  if (typeof process !== 'undefined' && process.env) {
+    process.env[key] = value
+    return null
+  }
+  return { Error: () => 'setenv not supported' }
+}
+
+export function Unsetenv(key: string): $.GoError {
+  if (typeof process !== 'undefined' && process.env) {
+    delete process.env[key]
+    return null
+  }
+  return { Error: () => 'unsetenv not supported' }
+}
+
+export function Clearenv(): void {
+  if (typeof process !== 'undefined' && process.env) {
+    for (const key in process.env) {
+      delete process.env[key]
+    }
+  }
+}
+
+export function Environ(): $.Slice<string> {
+  if (typeof process !== 'undefined' && process.env) {
+    const env: string[] = []
+    for (const [key, value] of Object.entries(process.env)) {
+      if (value !== undefined) {
+        env.push(`${key}=${value}`)
+      }
+    }
+    return $.arrayToSlice(env)
+  }
+  return $.arrayToSlice([])
+}