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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build darwin freebsd linux netbsd openbsd

package time

import "syscall"

// for testing: whatever interrupts a sleep
func interrupt() {
        syscall.Kill(syscall.Getpid(), syscall.SIGCHLD)
}

// readFile reads and returns the content of the named file.
// It is a trivial implementation of ioutil.ReadFile, reimplemented
// here to avoid depending on io/ioutil or os.
func readFile(name string) ([]byte, error) {
        f, err := syscall.Open(name, syscall.O_RDONLY, 0)
        if err != nil {
                return nil, err
        }
        defer syscall.Close(f)
        var (
                buf [4096]byte
                ret []byte
                n   int
        )
        for {
                n, err = syscall.Read(f, buf[:])
                if n > 0 {
                        ret = append(ret, buf[:n]...)
                }
                if n == 0 || err != nil {
                        break
                }
        }
        return ret, err
}