[all-commits] [llvm/llvm-project] 3c7727: [libc] Use the dup2 syscall wrapper in posix_spawn...

[Mikhail R. Gadelha via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3c7727f1269e5986915aacf4ee1ae117843bd573
      https://github.com/llvm/llvm-project/commit/3c7727f1269e5986915aacf4ee1ae117843bd573
  Author: Mikhail R. Gadelha <mikhail at igalia.com>
  Date:   2026-07-07 (Tue, 07 Jul 2026)

  Changed paths:
    M libc/src/spawn/linux/CMakeLists.txt
    M libc/src/spawn/linux/posix_spawn.cpp

  Log Message:
  -----------
  [libc] Use the dup2 syscall wrapper in posix_spawn (#207879)

posix_spawn's local dup2 helper fell back to a bare dup3 on targets
without SYS_dup2. dup3 fails with EINVAL when oldfd == newfd, where dup2
must instead return oldfd if it is valid, so
posix_spawn_file_actions_adddup2 with equal fds misbehaved on those
targets. linux_syscalls::dup2 already implements the correct fallback,
so call it directly and drop the local helper.



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