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send(2)								       send(2)

Name
       send, sendto, sendmsg - send a message from a socket

Syntax
       #include <sys/types.h>
       #include <sys/socket.h>

       cc = send(s, msg, len, flags)
       int cc, s;
       char *msg;
       int len, flags;

       cc = sendto(s, msg, len, flags, to, tolen)
       int cc, s;
       char *msg;
       int len, flags;
       struct sockaddr *to;
       int tolen;

       cc = sendmsg(s, msg, flags)
       int cc, s;
       struct msghdr msg[];
       int flags;

Description
       The  and system calls are used to transmit a message to another socket.
       The system call may be used only when the  socket  is  in  a  connected
       state, while the and system calls may be used at any time.

       The  address  of	 the  target is given by to, with tolen specifying its
       size.  The length of the message is given by len.  If  the  message  is
       too  long to pass atomically through the underlying protocol, the error
       EMSGSIZE is returned, and the  message  is  not	transmitted.   If  the
       address specified in the argument is a broadcast address, the SO_BROAD‐
       CAST option must be set for broadcasting to succeed.

       No indication of failure to deliver is implicit in a Return  values  of
       -1 indicate some locally detected errors.

       If  no messages space is available at the socket to hold the message to
       be transmitted, normally blocks, unless the socket has been  placed  in
       nonblocking  I/O	 mode.	 The  call can be used to determine when it is
       possible to send more data.

       The flags parameter can be set to MSG_OOB to send out-of-band  data  on
       sockets that support this features (for example, SOCK_STREAM).

       See for a description of the msghdr structure.

       The  call  returns  the	number	of  characters sent, or -1 if an error
       occurred.

Diagnostics
       [EBADF]		   An invalid descriptor was specified.

       [EDESTADDRREQ]	   A required address was omitted from an operation on
			   a socket.

       [EFAULT]		   An  invalid	user space address was specified for a
			   parameter.

       [EINVAL]		   An invalid argument	length	for  the  message  was
			   specified.

       [EINTR]		   The send was interrupted by delivery of a signal.

       [ENOTCONN]	   The socket is not connected.

       [ENOTSOCK]	   The argument s is not a socket.

       [EMSGSIZE]	   The	socket	requires  that messages be sent atomi‐
			   cally, and the size of the message to be sent  made
			   this impossible.

       [EPIPE]		   A  write  on a pipe or socket for which there is no
			   process to read the data.

       [EWOULDBLOCK]	   The socket is marked nonblocking, and the requested
			   operation would block.

See Also
       recv(2), getsockopt(2), socket(2)

								       send(2)
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