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ssh/terminal: add GetState and make ReadPassword work in raw mode.

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GetState is useful for restoring the terminal in a signal handler.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6990043
This commit is contained in:
Adam Langley
2012-12-22 11:02:28 -05:00
parent 24437a6651
commit ae4bfd41ff
1 changed files with 13 additions and 0 deletions
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13
util.go
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@@ -53,6 +53,17 @@ func MakeRaw(fd int) (*State, error) {
return &oldState, nil
}
// GetState returns the current state of a terminal which may be useful to
// restore the terminal after a signal.
func GetState(fd int) (*State, error) {
var oldState State
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCGETS), uintptr(unsafe.Pointer(&oldState.termios)), 0, 0, 0); err != 0 {
return nil, err
}
return &oldState, nil
}
// Restore restores the terminal connected to the given file descriptor to a
// previous state.
func Restore(fd int, state *State) error {
@@ -81,6 +92,8 @@ func ReadPassword(fd int) ([]byte, error) {
newState := oldState
newState.Lflag &^= syscall.ECHO
newState.Lflag |= syscall.ICANON | syscall.ISIG
newState.Iflag |= syscall.ICRNL
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCSETS), uintptr(unsafe.Pointer(&newState)), 0, 0, 0); err != 0 {
return nil, err
}