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NN_SEND(3) nanomsg 1.1.5 NN_SEND(3) NAME nn_send - send a message SYNOPSIS #include <nanomsg/nn.h> int nn_send (int s, const void *buf, size_t len, int flags); DESCRIPTION The function will send a message containing the data from buffer pointed to by buf parameter to the socket s. The message will be len bytes long. Alternatively, to send a buffer allocated by nn_allocmsg(3) function set the buf parameter to point to the pointer to the buffer and len parameter to NN_MSG constant. In this case a successful call to nn_send will deallo- cate the buffer. Trying to deallocate it afterwards will result in unde- fined behaviour. Which of the peers the message will be sent to is determined by the partic- ular socket type. The flags argument is a combination of the flags defined below: NN_DONTWAIT 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. RETURN VALUE If the function succeeds, the number of bytes in the message is returned. Otherwise, -1 is returned and errno is set to to one of the values defined below. ERRORS EFAULT buf is NULL or len is NN_MSG and the message pointer (pointed to by buf) is NULL. 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 the 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 mes- sage 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. EXAMPLE Using data directly: nbytes = nn_send (s, "ABC", 3, 0); assert (nbytes == 3); Using a pre-allocated message buffer: void *msg = nn_allocmsg(3, 0); strncpy(msg, "ABC", 3); nbytes = nn_send (s, &msg, NN_MSG, 0); assert (nbytes == 3); SEE ALSO nn_recv(3) nn_sendmsg(3) nn_socket(3) nanomsg(7) AUTHORS Martin Sustrik <sustrik@250bpm.com> 2018-10-15 NN_SEND(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLE | SEE ALSO | AUTHORS
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