doorgo/door/input_linux.go

package door

import (
	"log"
	"sync/atomic"
	"syscall"
)

func Reader(handle int, d *Door) {
	// I don't need the select anymore.  Let the read block.
	// defer d.wg.Done()
	defer func() {
		log.Printf("~Reader2\n")
		if d.ReaderCanClose {
			d.wg.Done()
		}
	}()
	defer func() {
		if err := recover(); err != nil {
			log.Printf("Reader: %#v\n", err)
		}
	}()

	var buffer []byte = make([]byte, 1)
	for {
		var read int
		var err error
		read, err = syscall.Read(handle, buffer)
		if err != nil {
			log.Printf("Reader ERR: %#v\n", err)
			close(d.readerChannel)
			if !d.Disconnect() {
				log.Println("Reader close writerChannel")
				// d.Disconnected = true
				atomic.StoreInt32(&d.Disconnected, 1)
				d.closeChannel <- struct{}{}
				// close(d.writerChannel)
				return
			}
			// break
			return
		}
		if read == 1 {
			d.readerChannel <- buffer[0]
		} else {
			log.Printf("READ FAILED %d\n", read)
			close(d.readerChannel)
			if !d.Disconnect() {
				log.Println("Reader close writerChannel")
				// d.Disconnected = true
				atomic.StoreInt32(&d.Disconnected, 1)
				d.closeChannel <- struct{}{}
				//close(d.writerChannel)
				return
			}
			// break
			return
		}
	}
}

/*
func Reader(handle int, readerChannel *chan byte) {
	// I don't need the select anymore.  Let the read block.
	defer func() {
		if err := recover(); err != nil {
			log.Printf("Reader: %#v\n", err)
		}
	}()

	buffer := make([]byte, 1)
	for {
		// blocking read in go routine
		// why doesn't this end when I close the handle?
		read, err := syscall.Read(handle, buffer)
		if err != nil {
			log.Printf("Reader ERR: %#v\n", err)
			close(*readerChannel)
			break
		}
		if read == 1 {
			*readerChannel <- buffer[0]
		} else {
			log.Printf("READ FAILED %d\n", read)
			close(*readerChannel)
			break
		}
	}
}

// This doesn't work.  Closing the handle does not unblock the syscall.Read above.
func CloseReader(handle int) {
	defer func() {
		if err := recover(); err != nil {
			log.Printf("CloseReader: %#v\n", err)
		}
	}()

	syscall.Close(handle)
}
*/