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v/vlib/net/common.v

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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
// ShutdownDirection is used by `net.shutdown`, for specifying the direction for which the
// communication will be cut.
pub enum ShutdownDirection {
read
write
read_and_write
}
[params]
pub struct ShutdownConfig {
how ShutdownDirection = .read_and_write
}
// shutdown shutsdown a socket, given its file descriptor `handle`.
// By default it shuts it down in both directions, both for reading
// and for writing. You can change that using `net.shutdown(handle, how: .read)`
// or `net.shutdown(handle, how: .write)`
pub fn shutdown(handle int, config ShutdownConfig) int {
$if windows {
return C.shutdown(handle, int(config.how))
} $else {
return C.shutdown(handle, int(config.how))
}
}
// close a socket, given its file descriptor `handle`.
pub fn close(handle int) ! {
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$if windows {
socket_error(C.closesocket(handle))!
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} $else {
socket_error(C.close(handle))!
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}
}
// Select waits for an io operation (specified by parameter `test`) to be available
fn @select(handle int, test Select, timeout time.Duration) !bool {
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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()
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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 {
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timeval_timeout = &C.timeval(0)
}
match test {
.read {
socket_error(C.@select(handle + 1, &set, C.NULL, C.NULL, timeval_timeout))!
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}
.write {
socket_error(C.@select(handle + 1, C.NULL, &set, C.NULL, timeval_timeout))!
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}
.except {
socket_error(C.@select(handle + 1, C.NULL, C.NULL, &set, timeval_timeout))!
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}
}
return C.FD_ISSET(handle, &set)
}
[inline]
fn select_deadline(handle int, test Select, deadline time.Time) !bool {
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// 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 {
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// Spurious wakeup from signal, keep waiting
continue
}
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// NOT a spurious wakeup
return err
}
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return ready
}
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// Deadline elapsed
return false
}
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// wait_for_common wraps the common wait code
fn wait_for_common(handle int, deadline time.Time, timeout time.Duration, test Select) ! {
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// 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)
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}
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ready := select_deadline(handle, test, real_deadline)!
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if ready {
return
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}
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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) ! {
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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) ! {
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return wait_for_common(handle, deadline, timeout, .read)
}