struct nn_iovec *msg_iov; int msg_iovlen; void *msg_control; size_t msg_controllen;
void *iov_base; size_t iov_len;
Specifies that the operation should be performed in non-blocking mode. If the message cannot be sent straight away, the function will fail with errno set to EAGAIN.
Either msghdr is NULL, there are multiple scatter buffers but length is set to NN_MSG for one of them, or the sum of iov_len values for the scatter buffers overflows size_t. These are early checks and no pre-allocated message is freed in this case.EMSGSIZE
msghdr→msg_iovlen is negative. This is an early check and no pre-allocated message is freed in this case.EFAULT
The supplied pointer for the pre-allocated message buffer or the scatter buffer is NULL, or the length for the scatter buffer is 0.EBADF
The provided socket is invalid.ENOTSUP
The operation is not supported by this socket type.EFSM
The operation cannot be performed on this socket at the moment because socket is not in the appropriate state. This error may occur with socket types that switch between several states.EAGAIN
Non-blocking mode was requested and the message cannot be sent at the moment.EINTR
The operation was interrupted by delivery of a signal before the message was sent.ETIMEDOUT
Individual socket types may define their own specific timeouts. If such timeout is hit this error will be returned.ETERM
The library is terminating.
struct nn_msghdr hdr; struct nn_iovec iov ; iov .iov_base = "Hello"; iov .iov_len = 5; iov .iov_base = "World"; iov .iov_len = 5; memset (&hdr, 0, sizeof (hdr)); hdr.msg_iov = iov; hdr.msg_iovlen = 2; nn_sendmsg (s, &hdr, 0);
void *msg; struct nn_msghdr hdr; struct nn_iovec iov; msg = nn_allocmsg(12, 0); strcpy(msg, "Hello World"); iov.iov_base = &msg; iov.iov_len = NN_MSG; memset (&hdr, 0, sizeof (hdr)); hdr.msg_iov = &iov; hdr.msg_iovlen = 1; nn_sendmsg (s, &hdr, 0);