1 #include <u.h>
2 #include <termios.h>
3 #include <stropts.h>
4 #include <libc.h>
5 #include "term.h"
6 
7 #define debug 0
8 
9 int
10 getpts(int fd[], char *slave)
11 {
12 	fd[1] = open("/dev/ptmx", ORDWR);
13 	if ((grantpt(fd[1]) < 0) || (unlockpt(fd[1]) < 0))
14 		return -1;
15 	fchmod(fd[1], 0622);
16 
17 	strcpy(slave, ptsname(fd[1]));
18 
19 	fd[0] = open(slave, ORDWR);
20 	if(fd[0] < 0)
21 		sysfatal("open %s: %r\n", slave);
22 
23 	/* set up the right streams modules for a tty */
24 	ioctl(fd[0], I_PUSH, "ptem");        /* push ptem */
25 	ioctl(fd[0], I_PUSH, "ldterm");      /* push ldterm */
26 
27 	return 0;
28 }
29 
30 int
31 childpty(int fd[], char *slave)
32 {
33 	int sfd;
34 
35 	close(fd[1]);
36 	setsid();
37 	sfd = open(slave, ORDWR);
38 	if(sfd < 0)
39 		sysfatal("open %s: %r\n", slave);
40 	return sfd;
41 }
42 
43 struct winsize ows;
44 
45 void
46 updatewinsize(int row, int col, int dx, int dy)
47 {
48 	struct winsize ws;
49 
50 	ws.ws_row = row;
51 	ws.ws_col = col;
52 	ws.ws_xpixel = dx;
53 	ws.ws_ypixel = dy;
54 	if(ws.ws_row != ows.ws_row || ws.ws_col != ows.ws_col)
55 	if(ioctl(rcfd, TIOCSWINSZ, &ws) < 0)
56 		fprint(2, "ioctl TIOCSWINSZ: %r\n");
57 	ows = ws;
58 }
59 
60 static struct termios ttmode;
61 
62 int
63 isecho(int fd)
64 {
65 	if(tcgetattr(fd, &ttmode) < 0)
66 		fprint(2, "tcgetattr: %r\n");
67 	if(debug) fprint(2, "israw %c%c\n",
68 		ttmode.c_lflag&ICANON ? 'c' : '-',
69 		ttmode.c_lflag&ECHO ? 'e' : '-');
70 	return (ttmode.c_lflag&ICANON && ttmode.c_lflag&ECHO);
71 }
72 
73 int
74 setecho(int fd, int newe)
75 {
76 	int old;
77 
78 	if(tcgetattr(fd, &ttmode) < 0)
79 		fprint(2, "tcgetattr: %r\n");
80 	old = (ttmode.c_lflag&ECHO)==ECHO;
81 	if(old != newe){
82 		if(newe)
83 			ttmode.c_lflag |= ECHO;
84 		else
85 			ttmode.c_lflag &= ~ECHO;
86 		if(tcsetattr(fd, TCSANOW, &ttmode) < 0)
87 			fprint(2, "tcsetattr: %r\n");
88 	}
89 	return old;
90 }