Repository navigation
Expand file tree
/
Copy pathpb_x.go
More file actions
108 lines (94 loc) · 2.17 KB
/
Copy pathpb_x.go
File metadata and controls
108 lines (94 loc) · 2.17 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
// +build linux darwin freebsd netbsd openbsd solaris dragonfly
package pb
import (
"errors"
"fmt"
"os"
"os/signal"
"runtime"
"sync"
"syscall"
"unsafe"
)
const (
TIOCGWINSZ = 0x5413
TIOCGWINSZ_OSX = 1074295912
)
var tty *os.File
var ErrPoolWasStarted = errors.New("Bar pool was started")
var echoLocked bool
var echoLockMutex sync.Mutex
func init() {
var err error
tty, err = os.Open("/dev/tty")
if err != nil {
tty = os.Stdin
}
}
func terminalWidth() (int, error) {
w := new(window)
tio := syscall.TIOCGWINSZ
if runtime.GOOS == "darwin" {
tio = TIOCGWINSZ_OSX
}
res, _, err := syscall.Syscall(sys_ioctl,
tty.Fd(),
uintptr(tio),
uintptr(unsafe.Pointer(w)),
)
if int(res) == -1 {
return 0, err
}
return int(w.Col), nil
}
var oldState syscall.Termios
func lockEcho() (quit chan int, err error) {
echoLockMutex.Lock()
defer echoLockMutex.Unlock()
if echoLocked {
err = ErrPoolWasStarted
return
}
echoLocked = true
fd := tty.Fd()
if _, _, e := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&oldState)), 0, 0, 0); e != 0 {
err = fmt.Errorf("Can't get terminal settings: %v", e)
return
}
newState := oldState
newState.Lflag &^= syscall.ECHO
newState.Lflag |= syscall.ICANON | syscall.ISIG
newState.Iflag |= syscall.ICRNL
if _, _, e := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlWriteTermios, uintptr(unsafe.Pointer(&newState)), 0, 0, 0); e != 0 {
err = fmt.Errorf("Can't set terminal settings: %v", e)
return
}
quit = make(chan int, 1)
go catchTerminate(quit)
return
}
func unlockEcho() (err error) {
echoLockMutex.Lock()
defer echoLockMutex.Unlock()
if !echoLocked {
return
}
echoLocked = false
fd := tty.Fd()
if _, _, e := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlWriteTermios, uintptr(unsafe.Pointer(&oldState)), 0, 0, 0); e != 0 {
err = fmt.Errorf("Can't set terminal settings")
}
return
}
// listen exit signals and restore terminal state
func catchTerminate(quit chan int) {
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt, syscall.SIGQUIT, syscall.SIGTERM, syscall.SIGKILL)
defer signal.Stop(sig)
select {
case <-quit:
unlockEcho()
case <-sig:
unlockEcho()
}
}