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Man Pages
MSEND(3) libdill Library Functions MSEND(3)

msend - sends a message


#include <libdill.h>
int msend(
    int s,
    const void* buf,
    size_t len,
    int64_t deadline);

    

This function sends a message to a socket. It is a blocking operation that unblocks only after entire message is sent. There is no such thing as partial send. If a problem, including timeout, occurs while sending the message error is returned to the user and the socket cannot be used for sending from that point on.

s: The socket to send the message to.

buf: Message to send.

len: Size of the message, in bytes.

deadline: A point in time when the operation should time out, in milliseconds. Use the now function to get your current point in time. 0 means immediate timeout, i.e., perform the operation if possible or return without blocking if not. -1 means no deadline, i.e., the call will block forever if the operation cannot be performed.

In case of success the function returns 0. In case of error it returns -1 and sets errno to one of the values below.

EBADF: Invalid handle.
EBUSY: The handle is currently being used by a different coroutine.
ECANCELED: Current coroutine was canceled.
ECONNRESET: Broken connection.
EINVAL: Invalid argument.
EMSGSIZE: The message is too long.
ENOTSUP: The handle does not support this operation.
EPIPE: Closed connection.
ETIMEDOUT: Deadline was reached.


int rc = msend(s, "ABC", 3, -1);

    

mrecv(3) mrecvl(3) msendl(3) now(3)
libdill

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