hunk.code_window: ## Using Release Channels for Environment Variable Configuration
   Enironment variables don't exist explicitly, but you can utilize release channels to make that happen!
   Say you have a workflow of releasing builds like this:
   - `exp publish --release-channel prod-v1`
  
hunk.labels: keep keep replace keep keep keep keep
hunk.after_edit: Environment variables don't exist explicitly, but you can utilize release channels to make that happen!
  
hunk.file_path: docs/versions/v24.0.0/guides/release-channels.md
hunk.type: replace
file: /*
   * Copyright 2016 Facebook, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #pragma once
  
  #include <sys/stat.h>
  
  #ifdef _WIN32
  // Windows gives weird names to these.
  #define S_IXUSR 0
  #define S_IWUSR _S_IWRITE
  #define S_IRUSR _S_IREAD
  // No group/other permissions so default to user.
  #define S_IXGRP S_IXUSR
  #define S_IWGRP S_IWUSR
  #define S_IRGRP S_IRUSR
  #define S_IXOTH S_IXUSR
  #define S_IWOTH S_IWUSR
  #define S_IROTH S_IRUSR
  #define S_IRWXU (S_IRUSR | S_IWUSR | S_IXUSR)
  #define S_IRWXG (S_IRGRP | S_IWGRP | S_IXGRP)
  
  // This isn't defined anywhere, so give a sane value.
  #define MAXSYMLINKS 255
  
  extern "C" {
  int chmod(char const* fn, int am);
  int lstat(const char* path, struct stat* st);
  int mkdir(const char* fn, int mode);
  int umask(int md);
  }
  #endif
  