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v/vlib/net/common.v
2022-05-13 06:56:21 +03:00

125 lines
3.2 KiB
V

module net
import time
// 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)
pub 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)
pub const infinite_timeout = time.infinite
// Shutdown shutsdown a socket and closes it
fn shutdown(handle int) ? {
$if windows {
C.shutdown(handle, C.SD_BOTH)
socket_error(C.closesocket(handle))?
} $else {
C.shutdown(handle, C.SHUT_RDWR)
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 == net.infinite_timeout {
timeval_timeout = &C.timeval(0)
}
match test {
.read {
socket_error(C.@select(handle + 1, &set, C.NULL, C.NULL, timeval_timeout))?
}
.write {
socket_error(C.@select(handle + 1, C.NULL, &set, C.NULL, timeval_timeout))?
}
.except {
socket_error(C.@select(handle + 1, C.NULL, C.NULL, &set, timeval_timeout))?
}
}
return C.FD_ISSET(handle, &set)
}
[inline]
fn select_deadline(handle int, test Select, deadline time.Time) ?bool {
// if we have a 0 deadline here then the timeout that was passed was infinite...
infinite := deadline.unix_time() == 0
for infinite || time.now() <= deadline {
timeout := if infinite { net.infinite_timeout } else { deadline - time.now() }
ready := @select(handle, test, timeout) or {
if err.code() == 4 {
// Spurious wakeup from signal, keep waiting
continue
}
// NOT a spurious wakeup
return err
}
return ready
}
// Deadline elapsed
return false
}
// wait_for_common wraps the common wait code
fn wait_for_common(handle int, deadline time.Time, timeout time.Duration, test Select) ? {
// Convert timeouts to deadlines
real_deadline := if timeout == net.infinite_timeout {
time.unix(0)
} else if timeout == 0 {
// No timeout set, so assume deadline
deadline
} else if timeout < 0 {
// TODO(emily): Do something nicer here :)
panic('invalid negative timeout')
} else {
// timeout
time.now().add(timeout)
}
ready := select_deadline(handle, test, real_deadline)?
if ready {
return
}
return 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)
}