read stdin with timeout

timeout_read_stdin.go

package main

import (
        "fmt"
        "log"
        "syscall"
)

func main() {
        rfdset := syscall.FdSet{Bits: [16]int64{int64(1)}}
        timeout := syscall.Timeval{Sec: 1}
        n := -1
        var err error
        n, err = syscall.Select(1, &rfdset, nil, nil, &timeout)
        if err != nil {
                log.Println("select : ", err)
        }
        if n == 1 {
                var number int
                _, err = fmt.Scanf("%d", &number)
                if err != nil {
                        log.Println("scanf : ", err)
                }
                log.Println("number: ", number)
        } else {
                log.Println("timeout.")
        }
}