1 #include <u.h>
2 #include <sys/types.h>
3 #include <sys/ioctl.h>
4 #include <sys/stat.h>
5 #include <errno.h>
6 #include <grp.h>
7 #include <termios.h>
8 #include <sys/termios.h>
9 #ifdef __linux__
10 #include <pty.h>
11 #endif
12 #include <fcntl.h>
13 #include <libc.h>
14 #include <draw.h>
15 #include "term.h"
16 
17 #define debug 0
18 
19 static char *abc =
20 	"abcdefghijklmnopqrstuvwxyz"
21 	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
22 	"0123456789";
23 static char *_123 =
24 	"0123456789"
25 	"abcdefghijklmnopqrstuvwxyz"
26 	"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
27 
28 int
29 getpts(int fd[], char *slave)
30 {
31 	char *a, *z;
32 	char pty[] = "/dev/ptyXX";
33 
34 	for(a=abc; *a; a++)
35 	for(z=_123; *z; z++){
36 		pty[8] = *a;
37 		pty[9] = *z;
38 		if((fd[1] = open(pty, ORDWR)) < 0){
39 			if(errno == ENOENT)
40 				break;
41 		}else{
42 			fchmod(fd[1], 0620);
43 			strcpy(slave, pty);
44 			slave[5] = 't';
45 			if((fd[0] = open(slave, ORDWR)) >= 0)
46 				return 0;
47 			close(fd[1]);
48 		}
49 	}
50 	sysfatal("no ptys");
51 	return 0;
52 }
53 
54 int
55 childpty(int fd[], char *slave)
56 {
57 	int sfd;
58 
59 	close(fd[1]);	/* drop master */
60 	setsid();
61 	sfd = open(slave, ORDWR);
62 	if(sfd < 0)
63 		sysfatal("child open %s: %r\n", slave);
64 	if(ioctl(sfd, TIOCSCTTY, 0) < 0)
65 		fprint(2, "ioctl TIOCSCTTY: %r\n");
66 	return sfd;
67 }
68 
69 struct winsize ows;
70 
71 void
72 updatewinsize(int row, int col, int dx, int dy)
73 {
74 	struct winsize ws;
75 
76 	ws.ws_row = row;
77 	ws.ws_col = col;
78 	ws.ws_xpixel = dx;
79 
80 	needdisplay(); // in case this is 'win' and not 9term
81 	// Leave "is this a hidpi display" in the low bit of the ypixel height for mc.
82 	dy &= ~1;
83 	if(display != nil && display->dpi >= DefaultDPI*3/2)
84 		dy |= 1;
85 	ws.ws_ypixel = dy;
86 
87 	if(ws.ws_row != ows.ws_row || ws.ws_col != ows.ws_col){
88 		if(ioctl(rcfd, TIOCSWINSZ, &ws) < 0)
89 			fprint(2, "ioctl: %r\n");
90 	}
91 	ows = ws;
92 }
93 
94 static struct termios ttmode;
95 
96 int
97 isecho(int fd)
98 {
99 	if(tcgetattr(fd, &ttmode) < 0)
100 		fprint(2, "tcgetattr: %r\n");
101 	if(debug) fprint(2, "israw %c%c\n",
102 		ttmode.c_lflag&ICANON ? 'c' : '-',
103 		ttmode.c_lflag&ECHO ? 'e' : '-');
104 	return ttmode.c_lflag&ECHO;
105 }
106 
107 int
108 getintr(int fd)
109 {
110 	if(tcgetattr(fd, &ttmode) < 0)
111 		return 0x7F;
112 	return ttmode.c_cc[VINTR];
113 }