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From: | Ken Brown |
Subject: | Re: Too many warnings building Emacs with GCC 6 on MSYS2-MinGW64 |
Date: | Thu, 1 Sep 2016 12:24:13 -0400 |
User-agent: | Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 |
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
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