libc/src/spawn/file_actions.h

   1 //===-- Spawn file actions  -------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_LIBC_SRC_SPAWN_FILE_ACTIONS_H
  10 #define LLVM_LIBC_SRC_SPAWN_FILE_ACTIONS_H
  11
  12 #include <spawn.h> // For mode_t
  13 #include <stdint.h>
  14
  15 namespace LIBC_NAMESPACE {
  16
  17 struct BaseSpawnFileAction {
  18   enum ActionType {
  19     OPEN = 111,
  20     CLOSE = 222,
  21     DUP2 = 333,
  22   };
  23
  24   ActionType type;
  25   BaseSpawnFileAction *next;
  26
  27   static void add_action(posix_spawn_file_actions_t *actions,
  28                          BaseSpawnFileAction *act) {
  29     if (actions->__back != nullptr) {
  30       auto *back = reinterpret_cast<BaseSpawnFileAction *>(actions->__back);
  31       back->next = act;
  32       actions->__back = act;
  33     } else {
  34       // First action is being added.
  35       actions->__front = actions->__back = act;
  36     }
  37   }
  38
  39 protected:
  40   explicit BaseSpawnFileAction(ActionType t) : type(t), next(nullptr) {}
  41 };
  42
  43 struct SpawnFileOpenAction : public BaseSpawnFileAction {
  44   const char *path;
  45   int fd;
  46   int oflag;
  47   mode_t mode;
  48
  49   SpawnFileOpenAction(const char *p, int fdesc, int flags, mode_t m)
  50       : BaseSpawnFileAction(BaseSpawnFileAction::OPEN), path(p), fd(fdesc),
  51         oflag(flags), mode(m) {}
  52 };
  53
  54 struct SpawnFileCloseAction : public BaseSpawnFileAction {
  55   int fd;
  56
  57   SpawnFileCloseAction(int fdesc)
  58       : BaseSpawnFileAction(BaseSpawnFileAction::CLOSE), fd(fdesc) {}
  59 };
  60
  61 struct SpawnFileDup2Action : public BaseSpawnFileAction {
  62   int fd;
  63   int newfd;
  64
  65   SpawnFileDup2Action(int fdesc, int new_fdesc)
  66       : BaseSpawnFileAction(BaseSpawnFileAction::DUP2), fd(fdesc),
  67         newfd(new_fdesc) {}
  68 };
  69
  70 } // namespace LIBC_NAMESPACE
  71
  72 #endif // LLVM_LIBC_SRC_SPAWN_FILE_ACTIONS_H