Re: [PATCH] compat/mingw: stubs for getpgid() and tcgetpgrp()

Hi Junio,

On 2015-04-15 20:48, Junio C Hamano wrote:

Johannes Sixt [off-list ref] writes:

quoted

Windows does not have process groups. It is, therefore, the simplest
to pretend that each process is in its own process group.

While here, move the getppid() stub from its old location (between
two sync related functions) next to the two new functions.

Signed-off-by: Johannes Sixt <redacted>
---

Thanks for a quick update.

The patch should do for now, but I suspect that it may give us a
better abstraction to make the "is_foreground_fd(int fd)" or even
"is_foreground(void)" the public API that would be implemented as

	int we_are_in_the_foreground(void)
        {
		return getpgid(0) == tcgetpgrp(fileno(stderr));
	}

in POSIX and Windows can implement entirely differently.

I really like it. We already require a couple of workarounds to be able to use `mintty` (which is a replacement terminal emulator that is more flexible than the default Windows terminal window, but it comes at the price that most Win32 programs think they are not running interactively inside a `mintty` session). I would really like to avoid having to finagle some really ugly code into `getpgid()` to make that test work.

In general, I find it rewarding not only from a portability point of view, but *especially* from a readability one if the code contains functions that are named semantically, i.e. they describe *why* they are called, not *how* they answer the question.

In this case, I would prefer the `is_foreground_fd(int fd)` one, but I am sure I can make the other signature work for us, too.

Ciao,
Dscho

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