send(3XNET)					   X/Open Networking Services Library Functions 				       send(3XNET)

NAME

       send - send a message on a socket

SYNOPSIS

       cc [ flag ... ] file ... -lxnet [ library ... ]
       #include <sys/socket.h>

       ssize_t send(int socket, const void *buffer, size_t length, int flags);

PARAMETERS

       socket	 Specifies the socket file descriptor.

       buffer	 Points to the buffer containing the message to send.

       length	 Specifies the length of the message in bytes.

       flags	 Specifies  the type of message transmission. Values of this argument are formed by logically OR'ing zero or more of the following
		 flags:

		 MSG_EOR    Terminates a record (if supported by the protocol)

		 MSG_OOB    Sends out-of-band data on sockets that support out-of-band communications. The significance and semantics  of  out-of-
			    band data are protocol-specific.

DESCRIPTION

       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  proto-
       col, 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_NON-
       BLOCK  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.

USAGE

       The send() function is identical to sendto(3XNET) with a null pointer dest_len argument, and to write() if no flags are used.

RETURN VALUES

       Upon successful completion, send() returns the number of bytes sent.  Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The send() function will fail if:

       EAGAIN	       The socket's file descriptor is marked O_NONBLOCK and the requested operation would block.
       EWOULDBLOCK

       EBADF	       The socket argument is not a valid file descriptor.

       ECONNRESET      A connection was forcibly closed by a peer.

       EDESTADDRREQ    The socket is not connection-mode and no peer address is set.

       EFAULT	       The  buffer parameter can not be accessed.

       EINTR	       A signal interrupted send() before any data was transmitted.

       EMSGSIZE        The message is too large be sent all at once, as the socket requires.

       ENOTCONN        The socket is not connected or otherwise has not had the peer prespecified.

       ENOTSOCK        The socket argument does not refer to a socket.

       EOPNOTSUPP      The socket argument is associated with a socket that does not support one or more of the values set in flags.

       EPIPE	       The  socket  is shut down for writing, or the socket is connection-mode and is no longer connected. In the latter case, and
		       if the socket is of type SOCK_STREAM, the SIGPIPE signal is generated to the calling thread.

       The send() function may fail if:

       EACCES	      The calling process does not have the appropriate privileges.

       EIO	      An I/O error occurred while reading from or writing to the file system.

       ENETDOWN       The local interface used to reach the destination is down.

       ENETUNREACH    No route to the network is present.

       ENOBUFS	      Insufficient resources were available in the system to perform the operation.

       ENOSR	      There were insufficient STREAMS resources available for the operation to complete.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       connect(3XNET), getsockopt(3XNET), poll(2), recv(3XNET), recvfrom(3XNET), recvmsg(3XNET), select(3C), sendmsg(3XNET),  sendto(3XNET),  set-
       sockopt(3XNET), shutdown(3XNET), socket(3XNET), attributes(5), standards(5)

SunOS 5.11							    1 Nov 2003							       send(3XNET)