module unix import time import net const ( error_ewouldblock = C.EWOULDBLOCK ) fn C.SUN_LEN(ptr &C.sockaddr_un) int fn C.strncpy(&char, &char, int) // Shutdown shutsdown a socket and closes it fn shutdown(handle int) ? { $if windows { C.shutdown(handle, C.SD_BOTH) net.socket_error(C.closesocket(handle)) ? } $else { C.shutdown(handle, C.SHUT_RDWR) net.socket_error(C.close(handle)) ? } } // Select waits for an io operation (specified by parameter `test`) to be available fn @select(handle int, test Select, timeout time.Duration) ?bool { set := C.fd_set{} C.FD_ZERO(&set) C.FD_SET(handle, &set) seconds := timeout / time.second microseconds := time.Duration(timeout - (seconds * time.second)).microseconds() mut tt := C.timeval{ tv_sec: u64(seconds) tv_usec: u64(microseconds) } mut timeval_timeout := &tt // infinite timeout is signaled by passing null as the timeout to // select if timeout == unix.infinite_timeout { timeval_timeout = &C.timeval(0) } match test { .read { net.socket_error(C.@select(handle + 1, &set, C.NULL, C.NULL, timeval_timeout)) ? } .write { net.socket_error(C.@select(handle + 1, C.NULL, &set, C.NULL, timeval_timeout)) ? } .except { net.socket_error(C.@select(handle + 1, C.NULL, C.NULL, &set, timeval_timeout)) ? } } return C.FD_ISSET(handle, &set) } // wait_for_common wraps the common wait code fn wait_for_common(handle int, deadline time.Time, timeout time.Duration, test Select) ? { if deadline.unix == 0 { // do not accept negative timeout if timeout < 0 { return net.err_timed_out } ready := @select(handle, test, timeout) ? if ready { return } return net.err_timed_out } // Convert the deadline into a timeout // and use that d_timeout := deadline.unix - time.now().unix if d_timeout < 0 { // deadline is in the past so this has already // timed out return net.err_timed_out } ready := @select(handle, test, d_timeout) ? if ready { return } return net.err_timed_out } // wait_for_write waits for a write io operation to be available fn wait_for_write(handle int, deadline time.Time, timeout time.Duration) ? { return wait_for_common(handle, deadline, timeout, .write) } // wait_for_read waits for a read io operation to be available fn wait_for_read(handle int, deadline time.Time, timeout time.Duration) ? { return wait_for_common(handle, deadline, timeout, .read) } // no_deadline should be given to functions when no deadline is wanted (i.e. all functions // return instantly) const ( no_deadline = time.Time{ unix: 0 } ) // no_timeout should be given to functions when no timeout is wanted (i.e. all functions // return instantly) const ( no_timeout = time.Duration(0) ) // infinite_timeout should be given to functions when an infinite_timeout is wanted (i.e. functions // only ever return with data) const ( infinite_timeout = time.infinite ) [inline] fn wrap_read_result(result int) ?int { if result != 0 { return result } return none }