Cygwin's writev() non-standard behavior

[qq qq]

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

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

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

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