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Date: Sun, 14 Aug 2011 19:42:00 -0000
From: Eli Zaretskii <eliz@gnu.org>
Subject: Re: [PATCH] An implementation of pipe to make I/O communication between gdb and shell. [MinGW question]
In-reply-to: <20110814170136.GA26819@host1.jankratochvil.net>
To: Jan Kratochvil <jan.kratochvil@redhat.com>
Cc: abhijit.k.halder@gmail.com, sergiodj@redhat.com, tromey@redhat.com, pedro@codesourcery.com, gdb-patches@sourceware.org
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> Date: Sun, 14 Aug 2011 19:01:36 +0200
> From: Jan Kratochvil <jan.kratochvil@redhat.com>
> Cc: abhijit.k.halder@gmail.com, sergiodj@redhat.com, tromey@redhat.com,
>         pedro@codesourcery.com, gdb-patches@sourceware.org
> 
> > What exactly might not work?
> 
> Abhijit Halder has suggested the suggested
> 	const char *argv[] = { "sh", "-c", "cat >/dev/null", NULL };
> 	pex_run (pipe->pex, PEX_LAST, "/bin/sh", argv, NULL, NULL, &status);
> works on UNIX but it will probably not work on MinGW as there is no "/bin/sh",
> is it?

The file name of the shell, the "-c" switch, and the null device
should all be system-dependent.  For MinGW, they should be,
respectively, "cmd.exe", "/c", and "nul".

> The current implementation:
> 	const char *argv[] = { "cat", ">/dev/null", NULL };
> 	pex_run (pipe->pex, PEX_SEARCH | PEX_LAST, "cat", argv, NULL, NULL, &status);
> produces that - therefore not working on UNIX:
> 	cat: >/dev/null: No such file or directory

How hard is it to parse the redirection characters?