Cygwin's writev() non-standard behavior

[qq qq]

writev() does not accept count 0 but it should

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

int main()
{
 Â struct iovec vec;

 Â memset(&vec, 0, sizeof(vec));
 Â if (writev(1, &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

This behavior is buggy per:

 Â  Â  Â  EINVAL ... the vector count count is less than zero or greater than the permitted maximum ...

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