From: Ken Brown <kbrown@cornell.edu>
To: Davis Herring <herring@lanl.gov>, Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org, Angelo Graziosi <angelo.graziosi@alice.it>
Subject: Re: Too many warnings building Emacs with GCC 6 on MSYS2-MinGW64
Date: Thu, 1 Sep 2016 12:24:13 -0400 [thread overview]
Message-ID: <aa98b236-98e9-c900-909b-869b090707ab@cornell.edu> (raw)
In-Reply-To: <3d9a7a28-d82c-2ad6-f4b0-adfebe6b6544@lanl.gov>
On 9/1/2016 12:17 PM, Davis Herring wrote:
>> On Unix, execve indeed returns an int, because it's a process ID. On
>> Windows, the return value can be a process handle, which is a 64-bit
>> data type on 64-bit Windows. That is why the return value must be
>> intptr_t, not an int.
>
> No, it's an error code. (You said as much for POSIX in your following
> message, but it's an error code on all systems.) If it succeeds, the
> process image has been replaced and it doesn't return at all.
The return value is not an error code. If the function returns, it
returns -1 and sets errno:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/exec.html
https://msdn.microsoft.com/en-us/library/hyw61wtd.aspx
Ken
next prev parent reply other threads:[~2016-09-01 16:24 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-31 8:01 Too many warnings building Emacs with GCC 6 on MSYS2-MinGW64 Angelo Graziosi
2016-08-31 14:27 ` Eli Zaretskii
2016-08-31 15:01 ` Angelo Graziosi
2016-08-31 15:42 ` Eli Zaretskii
2016-08-31 17:40 ` Angelo Graziosi
2016-08-31 18:11 ` Ken Brown
2016-08-31 18:47 ` Eli Zaretskii
2016-08-31 19:56 ` Angelo Graziosi
2016-09-01 2:37 ` Eli Zaretskii
2016-09-01 7:44 ` Angelo Graziosi
2016-09-01 14:17 ` Eli Zaretskii
2016-09-01 15:42 ` Angelo Graziosi
2016-09-01 16:04 ` Eli Zaretskii
2016-09-01 16:12 ` Eli Zaretskii
2016-09-01 16:14 ` Angelo Graziosi
2016-09-01 16:17 ` Davis Herring
2016-09-01 16:24 ` Ken Brown [this message]
2016-09-01 17:43 ` Davis Herring
2016-09-01 16:29 ` Eli Zaretskii
2016-09-01 16:32 ` Andreas Schwab
2016-09-01 16:49 ` Eli Zaretskii
2016-09-01 16:25 ` Angelo Graziosi
2016-09-01 16:30 ` Eli Zaretskii
2016-09-01 19:44 ` Angelo Graziosi
2016-09-01 17:19 ` Eli Zaretskii
2016-08-31 18:18 ` Eli Zaretskii
2016-09-01 18:50 ` Richard Stallman
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