|SEND(3XNET)||X/Open Networking Services Library Functions||SEND(3XNET)|
send - send a message on a socket
cc [ flag ... ] file ... -lxnet [ library ... ] #include <sys/socket.h> ssize_t send(int socket, const void *buffer, size_t length, int flags);
The send() function initiates transmission of a message from the specified socket to its peer. The send() function sends a message only when the socket is connected (including when the peer of a connectionless socket has been set via connect(3XNET)).
The length of the message to be sent is specified by the length argument. If the message is too long to pass through the underlying protocol, send() fails and no data is transmitted.
Successful completion of a call to send() does not guarantee delivery of the message. A return value of −1 indicates only locally-detected errors.
If space is not available at the sending socket to hold the message to be transmitted and the socket file descriptor does not have O_NONBLOCK set, send() blocks until space is available. If space is not available at the sending socket to hold the message to be transmitted and the socket file descriptor does have O_NONBLOCK set, send() will fail. The select(3C) and poll(2) functions can be used to determine when it is possible to send more data.
The socket in use may require the process to have appropriate privileges to use the send() function.
The send() function is identical to sendto(3XNET) with a null pointer dest_len argument, and to write() if no flags are used.
Upon successful completion, send() returns the number of bytes sent. Otherwise, −1 is returned and errno is set to indicate the error.
In addition to the errors documented below, an asynchronous error generated by the underlying socket protocol may be returned. For the full list of errors, please see the corresponding socket protocol manual page. For example, for a list of TCP errors, please see tcp(4P).
The send() function will fail if:
The send() function may fail if:
See attributes(7) for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|
poll(2), select(3C), connect(3XNET), getsockopt(3XNET), recv(3XNET), recvfrom(3XNET), recvmsg(3XNET), sendmsg(3XNET), sendto(3XNET), setsockopt(3XNET), shutdown(3XNET), socket(3XNET), tcp(4P), attributes(7), standards(7)
|September 10, 2018||OmniOS|