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RE: cygwin 1.5.11: execv doesn't set argv on Windows programs
- From: Igor Pechtchanski <pechtcha at cs dot nyu dot edu>
- To: Chuck McDevitt <cmcdevitt at ABINITIO dot COM>
- Cc: "David A. Rogers" <darogers at speakeasy dot net>, cygwin at cygwin dot com, Dave Korn <dk at artimi dot com>
- Date: Fri, 10 Sep 2004 14:48:24 -0400 (EDT)
- Subject: RE: cygwin 1.5.11: execv doesn't set argv on Windows programs
- References: <OF11317D53.7B086299-ON85256F0B.006544CE-85256F0B.0065AD2C@abinitio.com>
- Reply-to: cygwin at cygwin dot com
On Fri, 10 Sep 2004, Chuck McDevitt wrote:
> argv and argc are concepts from the C runtime, not the Windows OS.
> The actual entry point to your program is to a routine that calls the
> initialization routines of the C library, then calls winMain.
> Those initialization routines get the command line via Win32 call,
> allocates memory for argv, and parses the command line.
> Windows itself has no requirement that an application support argv and
> argc, and in fact programs in other languages (VB etc) don't have any such
Ok, so I didn't use quite the right phrasing, but I believe it's been
explained adequately since.
> Cygwin, when launching an application, just needs to make sure the
> CreateProcess call has the command line passed to it.
> Everything else is handled by the the receiving program (via C runtime, if
> a C program).
Exactly, with one small clarification: "Cygwin, when launching an
application, just needs to make sure the CreateProcess call has the
*right* command line passed to it.". Currently, spawn_guts() munges the
first token in that command line to match the image name, even if
instructed otherwise (via the args array).
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