Is there a way to cancel a pending operation (without disconnect) or set a timeout for the boost library functions?
I.e. I want to set a timeout on blocking socket in boost asio?
socket.read_some(boost::asio::buffer(pData, maxSize), error_);
Example: I want to read some from the socket, but I want to throw an error if 10 seconds have passed.
Under Linux/BSD the timeout on I/O operations on sockets is directly supported by the operating system. The option can be enabled via setsocktopt()
. I don't know if boost::asio
provides a method for setting it or exposes the socket scriptor to allow you to directly set it -- the latter case is not really portable.
For a sake of completeness here's the description from the man page:
SO_RCVTIMEO and SO_SNDTIMEO
Specify the receiving or sending timeouts until reporting an error. The argument is a struct timeval. If an input or output function blocks for this period of time, and data has been sent or received, the return value of that function will be the amount of data transferred; if no data has been transferred and the timeout has been reached then -1 is returned with errno set to EAGAIN or EWOULDBLOCK just as if the socket was specified to be non-blocking. If the timeout is set to zero (the default) then the operation will never timeout. Timeouts only have effect for system calls that perform socket I/O (e.g., read(2), recvmsg(2), send(2), sendmsg(2)); timeouts have no effect for select(2), poll(2), epoll_wait(2), etc.