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Date: Wed, 23 Apr 2014 14:53:00 -0000
From: "qq qq" <miska0000@gmx.com>
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Subject: Re: Cygwin's writev() non-standard behavior
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> furthermore, cygwin should emulate Linux behavior, even if POSIX
> doesn't define the behavior.

And which is why I compared Linux vs. Cygwin in my original post ?

> so your argument is flawed - you have triggered undefined behavior.

Same difference:
$ cat test.c
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/uio.h>

int main()
{
  struct iovec vec;
  int fd = open("test.out", O_WRONLY | O_CREAT, 0666);
  memset(&vec, 0, sizeof(vec));
  if (writev(fd, &vec, 0) < 0)
    perror("writev");
  return 0;
}

Linux:
$ gcc -Wall test.c
$ ./a.out

Cygwin:
$ gcc -Wall test.c
$ ./a.exe
writev: Invalid argument

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