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Jakub ZelenkaandDavid Carlier 32a0f3b6cf IO copy API for stream copying (#20399)
This introduces new API for fd copying and modifies
php_stream_copy_to_stream_ex to use it. The implementation is separated
for various platforms and the end result have couple of implications:

- sendfile is used for copying file to generic fd (e.g. sockets) on all
  platforms except Windows that use TransmitFile
- splice is used for copying between generic fds (e.g. sockets) on
  Linux
- copy_file_range should get used on alpine linux with directly using
  syscall (as musl does not seem to implement it)
- copy_file_range is used in the loop so it is used multiple times for
  files bigger than 2GB on Linux.
- file mmap for copying is removed as it allowed crashing PHP when
  another process modified mapped file - this was used as a fallback
  for file copying. Sendfile should partially replace it.
- File to file copying was optimized on Windows with use of ReadFile
  and WriteFile.

This also adds various tests including Linux unit tests.

Closes GH-20399

Co-authored-by: David Carlier <devnexen@gmail.com>
2026-07-19 17:15:16 +02:00
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