[all-commits] [llvm/llvm-project] 5afb93: [libc++] Implements filebuf unbuffered. (#76629)

[Mark de Wever via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5afb937d8a30445642ccaf33866ee4cdd0713222
      https://github.com/llvm/llvm-project/commit/5afb937d8a30445642ccaf33866ee4cdd0713222
  Author: Mark de Wever <koraq at xs4all.nl>
  Date:   2024-03-14 (Thu, 14 Mar 2024)

  Changed paths:
    M libcxx/include/fstream
    A libcxx/test/std/input.output/file.streams/fstreams/filebuf.virtuals/setbuf.pass.cpp

  Log Message:
  -----------
  [libc++] Implements filebuf unbuffered. (#76629)

When calling setbuf(nullptr, 0) before performing file operations it
should set the file to unbuffered mode. Currently the code avoids
buffering internally, but the underlying stream still can buffer.

This is addressed by disabling the buffering of the underlying stream.

Fixes: https://github.com/llvm/llvm-project/issues/60509



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