Fix Process.exec stream redirection on Windows
#14986
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HertzDevil
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kind:bug
straight-shoota
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Sep 9, 2024
Co-authored-by: Johannes Müller <straightshoota@gmail.com>
straight-shoota
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Sep 10, 2024
straight-shoota
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Sep 17, 2024
The following should print the compiler help message to the file `foo.txt`:
```crystal
File.open("foo.txt", "w") do |f|
Process.exec("crystal", output: f)
end
```
It used to work on Windows in Crystal 1.12, but is now broken since 1.13. This is because `LibC._wexecvp` only inherits file descriptors in the C runtime, not arbitrary Win32 file handles; since we stopped calling `LibC._open_osfhandle`, the C runtime knows nothing about any reopened standard streams in Win32. Thus the above merely prints the help message to the standard output.
This PR creates the missing C file descriptors right before `LibC._wexecvp`. It also fixes a different regression of #14947 where reconfiguring `STDIN.blocking` always fails.
Co-authored-by: Johannes Müller <straightshoota@gmail.com>
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This pull request has been mentioned on Crystal Forum. There might be relevant details there: https://forum.crystal-lang.org/t/crystal-1-13-3-is-released/7191/1 |
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The following should print the compiler help message to the file
foo.txt:It used to work on Windows in Crystal 1.12, but is now broken since 1.13. This is because
LibC._wexecvponly inherits file descriptors in the C runtime, not arbitrary Win32 file handles; since we stopped callingLibC._open_osfhandle, the C runtime knows nothing about any reopened standard streams in Win32. Thus the above merely prints the help message to the standard output.This PR creates the missing C file descriptors right before
LibC._wexecvp. It also fixes a different regression of #14947 where reconfiguringSTDIN.blockingalways fails.Related: #14422