plan9port

fork of plan9port with libvec, libstr and libsdb
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bsdpty.c (2110B)

      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 #ifdef HAS_SYS_TERMIOS
      9 #include <sys/termios.h>
     10 #endif
     11 #ifdef __linux__
     12 #include <pty.h>
     13 #endif
     14 #include <fcntl.h>
     15 #include <libc.h>
     16 #include <draw.h>
     17 #include "term.h"
     18 
     19 #define debug 0
     20 
     21 static char *abc =
     22 	"abcdefghijklmnopqrstuvwxyz"
     23 	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
     24 	"0123456789";
     25 static char *_123 =
     26 	"0123456789"
     27 	"abcdefghijklmnopqrstuvwxyz"
     28 	"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
     29 
     30 int
     31 getpts(int fd[], char *slave)
     32 {
     33 	char *a, *z;
     34 	char pty[] = "/dev/ptyXX";
     35 
     36 	for(a=abc; *a; a++)
     37 	for(z=_123; *z; z++){
     38 		pty[8] = *a;
     39 		pty[9] = *z;
     40 		if((fd[1] = open(pty, ORDWR)) < 0){
     41 			if(errno == ENOENT)
     42 				break;
     43 		}else{
     44 			fchmod(fd[1], 0620);
     45 			strcpy(slave, pty);
     46 			slave[5] = 't';
     47 			if((fd[0] = open(slave, ORDWR)) >= 0)
     48 				return 0;
     49 			close(fd[1]);
     50 		}
     51 	}
     52 	sysfatal("no ptys");
     53 	return 0;
     54 }
     55 
     56 int
     57 childpty(int fd[], char *slave)
     58 {
     59 	int sfd;
     60 
     61 	close(fd[1]);	/* drop master */
     62 	setsid();
     63 	sfd = open(slave, ORDWR);
     64 	if(sfd < 0)
     65 		sysfatal("child open %s: %r\n", slave);
     66 #if !defined (__AIX__)
     67 	if(ioctl(sfd, TIOCSCTTY, 0) < 0)
     68 		fprint(2, "ioctl TIOCSCTTY: %r\n");
     69 #endif
     70 	return sfd;
     71 }
     72 
     73 struct winsize ows;
     74 
     75 void
     76 updatewinsize(int row, int col, int dx, int dy)
     77 {
     78 	struct winsize ws;
     79 
     80 	ws.ws_row = row;
     81 	ws.ws_col = col;
     82 	ws.ws_xpixel = dx;
     83 
     84 	needdisplay(); // in case this is 'win' and not 9term
     85 	// Leave "is this a hidpi display" in the low bit of the ypixel height for mc.
     86 	dy &= ~1;
     87 	if(display != nil && display->dpi >= DefaultDPI*3/2)
     88 		dy |= 1;
     89 	ws.ws_ypixel = dy;
     90 
     91 	if(ws.ws_row != ows.ws_row || ws.ws_col != ows.ws_col){
     92 		if(ioctl(rcfd, TIOCSWINSZ, &ws) < 0)
     93 			fprint(2, "ioctl: %r\n");
     94 	}
     95 	ows = ws;
     96 }
     97 
     98 static struct termios ttmode;
     99 
    100 int
    101 isecho(int fd)
    102 {
    103 	if(tcgetattr(fd, &ttmode) < 0)
    104 		fprint(2, "tcgetattr: %r\n");
    105 	if(debug) fprint(2, "israw %c%c\n",
    106 		ttmode.c_lflag&ICANON ? 'c' : '-',
    107 		ttmode.c_lflag&ECHO ? 'e' : '-');
    108 	return ttmode.c_lflag&ECHO;
    109 }
    110 
    111 int
    112 getintr(int fd)
    113 {
    114 	if(tcgetattr(fd, &ttmode) < 0)
    115 		return 0x7F;
    116 	return ttmode.c_cc[VINTR];
    117 }