Source file src/pkg/os/signal/internal/pty/pty.go

     1	// Copyright 2017 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 aix darwin dragonfly freebsd linux,!android netbsd openbsd
     6	// +build cgo
     7	
     8	// Package pty is a simple pseudo-terminal package for Unix systems,
     9	// implemented by calling C functions via cgo.
    10	// This is only used for testing the os/signal package.
    11	package pty
    12	
    13	/*
    14	#define _XOPEN_SOURCE 600
    15	#include <fcntl.h>
    16	#include <stdlib.h>
    17	#include <unistd.h>
    18	*/
    19	import "C"
    20	
    21	import (
    22		"fmt"
    23		"os"
    24		"syscall"
    25	)
    26	
    27	type PtyError struct {
    28		FuncName    string
    29		ErrorString string
    30		Errno       syscall.Errno
    31	}
    32	
    33	func ptyError(name string, err error) *PtyError {
    34		return &PtyError{name, err.Error(), err.(syscall.Errno)}
    35	}
    36	
    37	func (e *PtyError) Error() string {
    38		return fmt.Sprintf("%s: %s", e.FuncName, e.ErrorString)
    39	}
    40	
    41	func (e *PtyError) Unwrap() error { return e.Errno }
    42	
    43	// Open returns a master pty and the name of the linked slave tty.
    44	func Open() (master *os.File, slave string, err error) {
    45		m, err := C.posix_openpt(C.O_RDWR)
    46		if err != nil {
    47			return nil, "", ptyError("posix_openpt", err)
    48		}
    49		if _, err := C.grantpt(m); err != nil {
    50			C.close(m)
    51			return nil, "", ptyError("grantpt", err)
    52		}
    53		if _, err := C.unlockpt(m); err != nil {
    54			C.close(m)
    55			return nil, "", ptyError("unlockpt", err)
    56		}
    57		slave = C.GoString(C.ptsname(m))
    58		return os.NewFile(uintptr(m), "pty-master"), slave, nil
    59	}
    60	

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