On Wed, 17 Mar 2010 12:50:51 +0000
Sad Clouds <cryintotheblue...@googlemail.com> wrote:
> Hi is there some undocumented system call that allows a user process
> to write to multiple descriptors in one go?
>
> What I'm looking for is a variation of writev() system call, e.g.:
>
> size_t write2v(int *d, int dcnt, const struct iovec *iov, int iovcnt);
>
> So the application builds an array of file descriptors and an array of
> iovec structures. It then calls write2v(), which goes through each
> file descriptor and writes buffers from iovec structures.
>
On second thoughts, there needs to be a way to handle partial writes
struct fdvec
{
int fd;
size_t nwritten;
};
int write2v(
struct fdvec *fdv, int fdvcnt, const struct iovec *iov, int iovcnt);
For each file descriptor, the function sets nwritten to the number of
bytes written. It returns 0 when all buffers in iovec structures were
written to all file descriptors, otherwise it returns >0 for each file
descriptor that was partially written.
