mirror of
https://github.com/status-im/status-go.git
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eeca435064
Update vendor Integrate rendezvous into status node Add a test with failover using rendezvous Use multiple servers in client Use discovery V5 by default and test that node can be started with rendezvous discovet Fix linter Update rendezvous client to one with instrumented stream Address feedback Fix test with updated topic limits Apply several suggestions Change log to debug for request errors because we continue execution Remove web3js after rebase Update rendezvous package
109 lines
2.1 KiB
Go
109 lines
2.1 KiB
Go
package eventfd
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/*
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* eventfd wrapper for go
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* Provides a ReadWriteCloser interface for handling eventfd()'s
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* Eventfd provides a simple filedescriptor with very low overhead.
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* It stores a bitfield of 64 bits which are added when written to
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* the fd.
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*
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* For more information on eventfd() see `man eventfd`.
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*/
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import (
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"fmt"
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"syscall"
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"github.com/gxed/GoEndian"
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)
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type EventFD struct {
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fd int
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valid bool
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}
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/* Create a new EventFD. */
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func New() (*EventFD, error) {
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fd, _, err := syscall.Syscall(syscall.SYS_EVENTFD2, 0, uintptr(syscall.O_CLOEXEC), 0)
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if err != 0 {
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return nil, err
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}
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e := &EventFD{
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fd: int(fd),
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valid: true,
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}
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return e, nil
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}
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/* Read events from Eventfd. p should be at max 8 bytes.
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* Returns the number of read bytes or 0 and error is set.
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*/
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func (e *EventFD) Read(p []byte) (int, error) {
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n, err := syscall.Read(e.fd, p[:])
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if err != nil {
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return 0, err
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}
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return n, nil
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}
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/* Read events into a uint64 and return it. Returns 0 and error
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* if an error occured
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*/
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func (e *EventFD) ReadEvents() (uint64, error) {
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buf := make([]byte, 8)
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n, err := syscall.Read(e.fd, buf[:])
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if err != nil {
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return 0, err
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}
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if n != 8 {
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return 0, fmt.Errorf("could not read for eventfd")
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}
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val := endian.Endian.Uint64(buf)
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return val, nil
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}
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/* Write bytes to eventfd. Will be added to the current
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* value of the internal uint64 of the eventfd().
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*/
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func (e *EventFD) Write(p []byte) (int, error) {
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n, err := syscall.Write(e.fd, p[:])
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if err != nil {
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return 0, err
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}
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return n, nil
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}
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/* Write a uint64 to eventfd. Value will be added to current value
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* of the eventfd
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*/
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func (e *EventFD) WriteEvents(val uint64) error {
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buf := make([]byte, 8)
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endian.Endian.PutUint64(buf, val)
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n, err := syscall.Write(e.fd, buf[:])
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if err != nil {
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return err
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}
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if n != 8 {
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return fmt.Errorf("could not write to eventfd")
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}
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return nil
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}
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/* Returns the filedescriptor which is internally used */
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func (e *EventFD) Fd() int {
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return e.fd
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}
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/* Close the eventfd */
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func (e *EventFD) Close() error {
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if e.valid == false {
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return nil
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}
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e.valid = false
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return syscall.Close(e.fd)
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}
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