1 // Copyright 2011 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build plan9 6 7 package time 8 9 import ( 10 "errors" 11 "syscall" 12 ) 13 14 // for testing: whatever interrupts a sleep 15 func interrupt() { 16 // cannot predict pid, don't want to kill group 17 } 18 19 // readFile reads and returns the content of the named file. 20 // It is a trivial implementation of ioutil.ReadFile, reimplemented 21 // here to avoid depending on io/ioutil or os. 22 func readFile(name string) ([]byte, error) { 23 f, err := syscall.Open(name, syscall.O_RDONLY) 24 if err != nil { 25 return nil, err 26 } 27 defer syscall.Close(f) 28 var ( 29 buf [4096]byte 30 ret []byte 31 n int 32 ) 33 for { 34 n, err = syscall.Read(f, buf[:]) 35 if n > 0 { 36 ret = append(ret, buf[:n]...) 37 } 38 if n == 0 || err != nil { 39 break 40 } 41 } 42 return ret, err 43 } 44 45 func open(name string) (uintptr, error) { 46 fd, err := syscall.Open(name, syscall.O_RDONLY) 47 if err != nil { 48 return 0, err 49 } 50 return uintptr(fd), nil 51 } 52 53 func closefd(fd uintptr) { 54 syscall.Close(int(fd)) 55 } 56 57 func preadn(fd uintptr, buf []byte, off int) error { 58 whence := seekStart 59 if off < 0 { 60 whence = seekEnd 61 } 62 if _, err := syscall.Seek(int(fd), int64(off), whence); err != nil { 63 return err 64 } 65 for len(buf) > 0 { 66 m, err := syscall.Read(int(fd), buf) 67 if m <= 0 { 68 if err == nil { 69 return errors.New("short read") 70 } 71 return err 72 } 73 buf = buf[m:] 74 } 75 return nil 76 } 77
