1 // Copyright 2017 Google LLC 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 // +build !windows 16 17 package differ 18 19 import "syscall" 20 21 // isatty reports whether fd is a tty. 22 // Actually it reports whether fd is a character device, which is close enough. 23 func isatty(fd int) bool { 24 var st syscall.Stat_t 25 if err := syscall.Fstat(fd, &st); err != nil { 26 return false 27 } 28 return st.Mode&syscall.S_IFMT == syscall.S_IFCHR 29 } 30