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terminal: reset back to non-raw mode in atexit

--- a/terminal_posix.c

+++ b/terminal_posix.c

@@ -4,11 +4,18 @@

 #include <termios.h>

 static bool inraw = false;

+static bool atexitset = false;

 static struct termios tios;

+static void termresetraw(void);

+

 static int

 termsetraw(bool raw)

 {

+	if(!atexitset){

+		atexit(termresetraw);

+		atexitset = true;

+	}

 	if(raw && !inraw){

 		if(tcgetattr(STDIN_FILENO, &tios) < 0)

 			return -1;

@@ -27,6 +34,12 @@

 		inraw = false;

 	}

 	return 0;

+}

+

+static void

+termresetraw(void)

+{

+	termsetraw(false);

 }

 BUILTIN("terminal-enter-raw-mode", terminal_enter_raw_mode)