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|
package main
import (
"fmt"
"os"
"os/signal"
"syscall"
"unsafe"
)
// Winsize is winsize struct got from the ioctl(2) system call.
type Winsize struct {
Row uint16
Col uint16
X uint16 // pixel value
Y uint16 // pixel value
}
// GetWinSize returns winsize struct which is the response of ioctl(2).
func GetWinSize(fd int) *Winsize {
ws := &Winsize{}
retCode, _, errno := syscall.Syscall(
syscall.SYS_IOCTL,
uintptr(fd),
uintptr(syscall.TIOCGWINSZ),
uintptr(unsafe.Pointer(ws)))
if int(retCode) == -1 {
panic(errno)
}
return ws
}
func main() {
signalChan := make(chan os.Signal, 1)
signal.Notify(
signalChan,
syscall.SIGHUP,
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGQUIT,
syscall.SIGWINCH,
)
ws := GetWinSize(syscall.Stdin)
fmt.Printf("Row %d : Col %d\n", ws.Row, ws.Col)
exitChan := make(chan int)
go func() {
for {
s := <-signalChan
switch s {
// kill -SIGHUP XXXX
case syscall.SIGHUP:
exitChan <- 0
// kill -SIGINT XXXX or Ctrl+c
case syscall.SIGINT:
exitChan <- 0
// kill -SIGTERM XXXX
case syscall.SIGTERM:
exitChan <- 0
// kill -SIGQUIT XXXX
case syscall.SIGQUIT:
exitChan <- 0
case syscall.SIGWINCH:
ws := GetWinSize(syscall.Stdin)
fmt.Printf("Row %d : Col %d\n", ws.Row, ws.Col)
default:
exitChan <- 1
}
}
}()
code := <-exitChan
os.Exit(code)
}
|
