1 #include <u.h>
2 #include <termios.h>
3 #include <stropts.h>
4 #include <signal.h>
5 #include <libc.h>
6 #include "term.h"
7 
8 #define debug 0
9 
10 int
11 getpts(int fd[], char *slave)
12 {
13 	void (*f)(int);
14 	int r;
15 
16 	fd[1] = open("/dev/ptmx", ORDWR);
17 	f = signal(SIGCLD, SIG_DFL);
18 	r = grantpt(fd[1]);
19 	signal(SIGCLD, f);
20 	if(r < 0 || unlockpt(fd[1]) < 0)
21 		return -1;
22 	fchmod(fd[1], 0622);
23 
24 	strcpy(slave, ptsname(fd[1]));
25 
26 	fd[0] = open(slave, ORDWR);
27 	if(fd[0] < 0)
28 		sysfatal("open %s: %r\n", slave);
29 
30 	/* set up the right streams modules for a tty */
31 	ioctl(fd[0], I_PUSH, "ptem");        /* push ptem */
32 	ioctl(fd[0], I_PUSH, "ldterm");      /* push ldterm */
33 
34 	return 0;
35 }
36 
37 int
38 childpty(int fd[], char *slave)
39 {
40 	int sfd;
41 
42 	close(fd[1]);
43 	setsid();
44 	sfd = open(slave, ORDWR);
45 	if(sfd < 0)
46 		sysfatal("open %s: %r\n", slave);
47 	return sfd;
48 }
49 
50 struct winsize ows;
51 
52 void
53 updatewinsize(int row, int col, int dx, int dy)
54 {
55 	struct winsize ws;
56 
57 	ws.ws_row = row;
58 	ws.ws_col = col;
59 	ws.ws_xpixel = dx;
60 	ws.ws_ypixel = dy;
61 	if(ws.ws_row != ows.ws_row || ws.ws_col != ows.ws_col)
62 	if(ioctl(rcfd, TIOCSWINSZ, &ws) < 0)
63 		fprint(2, "ioctl TIOCSWINSZ: %r\n");
64 	ows = ws;
65 }
66 
67 static struct termios ttmode;
68 
69 int
70 isecho(int fd)
71 {
72 	if(tcgetattr(fd, &ttmode) < 0)
73 		fprint(2, "tcgetattr: %r\n");
74 	if(debug) fprint(2, "israw %c%c\n",
75 		ttmode.c_lflag&ICANON ? 'c' : '-',
76 		ttmode.c_lflag&ECHO ? 'e' : '-');
77 	return (ttmode.c_lflag&ICANON && ttmode.c_lflag&ECHO);
78 }
79 
80 int
81 getintr(int fd)
82 {
83 	if(tcgetattr(fd, &ttmode) < 0)
84 		return 0x7F;
85 	return ttmode.c_cc[VINTR];
86 }