mdw@git.distorted.org.uk Git - termux-packages/blob - packages/mosh/pty.cc.patch

   1 --- ../mosh/src/frontend/pty.cc 2016-04-29 00:42:37.207832463 +1000
   2 +++ ./src/frontend/pty.cc       2016-04-29 00:40:31.306486322 +1000
   3 @@ -0,0 +1,147 @@
   4 +/*
   5 +    Mosh: the mobile shell
   6 +    Copyright 2012 Keith Winstein
   7 +
   8 +    This program is free software: you can redistribute it and/or modify
   9 +    it under the terms of the GNU General Public License as published by
  10 +    the Free Software Foundation, either version 3 of the License, or
  11 +    (at your option) any later version.
  12 +
  13 +    This program is distributed in the hope that it will be useful,
  14 +    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 +    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 +    GNU General Public License for more details.
  17 +
  18 +    You should have received a copy of the GNU General Public License
  19 +    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 +*/
  21 +
  22 +#include "config.h"
  23 +
  24 +#include <sys/types.h>
  25 +#include <sys/stat.h>
  26 +#include <sys/ioctl.h>
  27 +#include <fcntl.h>
  28 +#include <termios.h>
  29 +#include <unistd.h>
  30 +#include <stdlib.h>
  31 +#include <errno.h>
  32 +#include <string.h>
  33 +#include <pty.h>
  34 +
  35 +#ifndef HAVE_OPENPTY
  36 +/* from dropbear 0.53.1 sshpty.c, original license: "can be used freely for any purpose." */
  37 +int my_openpty (int *amaster, int *aslave, char *name, const struct termios *termp,
  38 +         const struct winsize *winp)
  39 +{
  40 +  int master, slave;
  41 +  char *name_slave;
  42 +
  43 +  master = open("/dev/ptmx", O_RDWR);
  44 +  if (master == -1) {
  45 +//    TRACE(("Fail to open master"))
  46 +    return -1;
  47 +  }
  48 +
  49 +  if (grantpt(master))
  50 +    goto fail;
  51 +
  52 +  if (unlockpt(master))
  53 +    goto fail;
  54 +
  55 +  name_slave = ptsname(master);
  56 +//  TRACE(("openpty: slave name %s", name_slave))
  57 +  slave = open(name_slave, O_RDWR | O_NOCTTY);
  58 +  if (slave == -1)
  59 +    {
  60 +      goto fail;
  61 +    }
  62 +
  63 +  if(termp)
  64 +    tcsetattr(slave, TCSAFLUSH, termp);
  65 +  if (winp)
  66 +    ioctl (slave, TIOCSWINSZ, winp);
  67 +
  68 +  *amaster = master;
  69 +  *aslave = slave;
  70 +  if (name != NULL)
  71 +    strcpy(name, name_slave);
  72 +
  73 +  return 0;
  74 +
  75 + fail:
  76 +  close (master);
  77 +  return -1;
  78 +}
  79 +#endif
  80 +
  81 +#ifndef HAVE_LOGIN_TTY
  82 +/* from glibc 2.14, login/login_tty.c, under the BSD license */
  83 +int login_tty(int fd)
  84 +{
  85 +        (void) setsid();
  86 +#ifdef TIOCSCTTY
  87 +        if (ioctl(fd, TIOCSCTTY, (char *)NULL) == -1)
  88 +                return (-1);
  89 +#else
  90 +        {
  91 +          /* This might work.  */
  92 +          char *fdname = ttyname (fd);
  93 +          int newfd;
  94 +          if (fdname)
  95 +            {
  96 +              if (fd != 0)
  97 +                (void) close (0);
  98 +              if (fd != 1)
  99 +                (void) close (1);
 100 +              if (fd != 2)
 101 +                (void) close (2);
 102 +              newfd = open (fdname, O_RDWR);
 103 +              (void) close (newfd);
 104 +            }
 105 +        }
 106 +#endif
 107 +        while (dup2(fd, 0) == -1 && errno == EBUSY)
 108 +          ;
 109 +        while (dup2(fd, 1) == -1 && errno == EBUSY)
 110 +          ;
 111 +        while (dup2(fd, 2) == -1 && errno == EBUSY)
 112 +          ;
 113 +        if (fd > 2)
 114 +                (void) close(fd);
 115 +        return (0);
 116 +}
 117 +#endif
 118 +
 119 +int my_forkpty (int *amaster, char *name, const struct termios *termp, const struct winsize *winp) {
 120 +#ifdef HAVE_FORKPTY
 121 +//return forkpty(amaster, name, termp, winp);
 122 +#else
 123 +/* from glibc 2.14, login/forkpty.c, under the LGPL 2.1 (or later) license */
 124 +  int master, slave, pid;
 125 +
 126 +  if (openpty (&master, &slave, name, termp, winp) == -1)
 127 +    return -1;
 128 +
 129 +  switch (pid = fork ())
 130 +    {
 131 +    case -1:
 132 +      close (master);
 133 +      close (slave);
 134 +      return -1;
 135 +    case 0:
 136 +      /* Child.  */
 137 +      close (master);
 138 +      if (login_tty (slave))
 139 +        _exit (1);
 140 +
 141 +      return 0;
 142 +    default:
 143 +      /* Parent.  */
 144 +      *amaster = master;
 145 +      close (slave);
 146 +
 147 +      return pid;
 148 +    }
 149 +#endif
 150 +}