tSunOS.c - plan9port - [fork] Plan 9 from user space
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       ---
       tSunOS.c (1529B)
       ---
            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 }