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Date: Wed, 23 Apr 2014 16:06:34 +0200
From: "qq qq" <miska0000 AT gmx DOT com>
Message-ID: <20140423140635.156430@gmx.com>
MIME-Version: 1.0
Subject: Cygwin's writev() non-standard behavior
To: cygwin AT cygwin DOT com
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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()
{
  struct iovec vec;

  memset(&vec, 0, sizeof(vec));
  if (writev(1, &vec, 0) < 0)
    perror("writev");
  return 0;
}

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

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

This behavior is buggy per:

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

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