libdill: Structured Concurrency for C

NAME

msend - sends a message

SYNOPSIS

#include <libdill.h>

int msend(
    int s,
    const void* buf,
    size_t len,
    int64_t deadline);

DESCRIPTION

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.

RETURN VALUE

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

ERRORS

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.

EXAMPLE

int rc = msend(s, "ABC", 3, -1);