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 "src/__support/macros/config.h"
  13 #include <spawn.h> // For mode_t
  14 #include <stdint.h>
  15
  16 namespace LIBC_NAMESPACE_DECL {
  17
  18 struct BaseSpawnFileAction {
  19   enum ActionType {
  20     OPEN = 111,
  21     CLOSE = 222,
  22     DUP2 = 333,
  23   };
  24
  25   ActionType type;
  26   BaseSpawnFileAction *next;
  27
  28   static void add_action(posix_spawn_file_actions_t *actions,
  29                          BaseSpawnFileAction *act) {
  30     if (actions->__back != nullptr) {
  31       auto *back = reinterpret_cast<BaseSpawnFileAction *>(actions->__back);
  32       back->next = act;
  33       actions->__back = act;
  34     } else {
  35       // First action is being added.
  36       actions->__front = actions->__back = act;
  37     }
  38   }
  39
  40 protected:
  41   explicit BaseSpawnFileAction(ActionType t) : type(t), next(nullptr) {}
  42 };
  43
  44 struct SpawnFileOpenAction : public BaseSpawnFileAction {
  45   const char *path;
  46   int fd;
  47   int oflag;
  48   mode_t mode;
  49
  50   SpawnFileOpenAction(const char *p, int fdesc, int flags, mode_t m)
  51       : BaseSpawnFileAction(BaseSpawnFileAction::OPEN), path(p), fd(fdesc),
  52         oflag(flags), mode(m) {}
  53 };
  54
  55 struct SpawnFileCloseAction : public BaseSpawnFileAction {
  56   int fd;
  57
  58   SpawnFileCloseAction(int fdesc)
  59       : BaseSpawnFileAction(BaseSpawnFileAction::CLOSE), fd(fdesc) {}
  60 };
  61
  62 struct SpawnFileDup2Action : public BaseSpawnFileAction {
  63   int fd;
  64   int newfd;
  65
  66   SpawnFileDup2Action(int fdesc, int new_fdesc)
  67       : BaseSpawnFileAction(BaseSpawnFileAction::DUP2), fd(fdesc),
  68         newfd(new_fdesc) {}
  69 };
  70
  71 } // namespace LIBC_NAMESPACE_DECL
  72
  73 #endif // LLVM_LIBC_SRC_SPAWN_FILE_ACTIONS_H