Merge pull request #239 from its-pointless/moshfront

[termux-packages] / packages / mosh / pty.cc.patch

--- ../mosh/src/frontend/pty.cc	2016-04-29 00:42:37.207832463 +1000
+++ ./src/frontend/pty.cc	2016-04-29 00:40:31.306486322 +1000
@@ -0,0 +1,147 @@
+/*
+    Mosh: the mobile shell
+    Copyright 2012 Keith Winstein
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <termios.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <pty.h>
+
+#ifndef HAVE_OPENPTY
+/* from dropbear 0.53.1 sshpty.c, original license: "can be used freely for any purpose." */
+int my_openpty (int *amaster, int *aslave, char *name, const struct termios *termp,
+         const struct winsize *winp)
+{
+  int master, slave;
+  char *name_slave;
+
+  master = open("/dev/ptmx", O_RDWR);
+  if (master == -1) {
+//    TRACE(("Fail to open master"))
+    return -1;
+  }
+
+  if (grantpt(master))
+    goto fail;
+
+  if (unlockpt(master))
+    goto fail;
+
+  name_slave = ptsname(master);
+//  TRACE(("openpty: slave name %s", name_slave))
+  slave = open(name_slave, O_RDWR | O_NOCTTY);
+  if (slave == -1)
+    {
+      goto fail;
+    }
+
+  if(termp)
+    tcsetattr(slave, TCSAFLUSH, termp);
+  if (winp)
+    ioctl (slave, TIOCSWINSZ, winp);
+
+  *amaster = master;
+  *aslave = slave;
+  if (name != NULL)
+    strcpy(name, name_slave);
+
+  return 0;
+
+ fail:
+  close (master);
+  return -1;
+}
+#endif
+
+#ifndef HAVE_LOGIN_TTY
+/* from glibc 2.14, login/login_tty.c, under the BSD license */
+int login_tty(int fd)
+{
+        (void) setsid();
+#ifdef TIOCSCTTY
+        if (ioctl(fd, TIOCSCTTY, (char *)NULL) == -1)
+                return (-1);
+#else
+        {
+          /* This might work.  */
+          char *fdname = ttyname (fd);
+          int newfd;
+          if (fdname)
+            {
+              if (fd != 0)
+                (void) close (0);
+              if (fd != 1)
+                (void) close (1);
+              if (fd != 2)
+                (void) close (2);
+              newfd = open (fdname, O_RDWR);
+              (void) close (newfd);
+            }
+        }
+#endif
+        while (dup2(fd, 0) == -1 && errno == EBUSY)
+          ;
+        while (dup2(fd, 1) == -1 && errno == EBUSY)
+          ;
+        while (dup2(fd, 2) == -1 && errno == EBUSY)
+          ;
+        if (fd > 2)
+                (void) close(fd);
+        return (0);
+}
+#endif
+
+int my_forkpty (int *amaster, char *name, const struct termios *termp, const struct winsize *winp) {
+#ifdef HAVE_FORKPTY
+//return forkpty(amaster, name, termp, winp);
+#else
+/* from glibc 2.14, login/forkpty.c, under the LGPL 2.1 (or later) license */
+  int master, slave, pid;
+
+  if (openpty (&master, &slave, name, termp, winp) == -1)
+    return -1;
+
+  switch (pid = fork ())
+    {
+    case -1:
+      close (master);
+      close (slave);
+      return -1;
+    case 0:
+      /* Child.  */
+      close (master);
+      if (login_tty (slave))
+        _exit (1);
+
+      return 0;
+    default:
+      /* Parent.  */
+      *amaster = master;
+      close (slave);
+
+      return pid;
+    }
+#endif
+}