forkpty-aix.c

   1 /*
   2  * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
   3  * Copyright (c) 2012 Ross Palmer Mohn <rpmohn@waxandwane.org>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  14  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  15  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include <sys/types.h>
  19 #include <sys/ioctl.h>
  20 #include <fcntl.h>
  21 #include <stdlib.h>
  22 #include <stropts.h>
  23 #include <unistd.h>
  24 #include <paths.h>
  25
  26 pid_t forkpty(int *master, char *name, struct termios *tio, struct winsize *ws)
  27 {
  28         int     slave, fd;
  29         char   *path;
  30         pid_t   pid;
  31         struct termios tio2;
  32
  33         if ((*master = open("/dev/ptc", O_RDWR|O_NOCTTY)) == -1)
  34                 return -1;
  35
  36         if ((path = ttyname(*master)) == NULL)
  37                 goto out;
  38         if ((slave = open(path, O_RDWR|O_NOCTTY)) == -1)
  39                 goto out;
  40
  41         switch (pid = fork()) {
  42         case -1:
  43                 goto out;
  44         case 0:
  45                 close(*master);
  46
  47                 fd = open(_PATH_TTY, O_RDWR|O_NOCTTY);
  48                 if (fd >= 0) {
  49                         ioctl(fd, TIOCNOTTY, NULL);
  50                         close(fd);
  51                 }
  52
  53                 if (setsid() < 0)
  54                         return -1;
  55
  56                 fd = open(_PATH_TTY, O_RDWR|O_NOCTTY);
  57                 if (fd >= 0)
  58                         return -1;
  59
  60                 fd = open(path, O_RDWR);
  61                 if (fd < 0)
  62                         return -1;
  63                 close(fd);
  64
  65                 fd = open("/dev/tty", O_WRONLY);
  66                 if (fd < 0)
  67                         return -1;
  68                 close(fd);
  69
  70                 if (tcgetattr(slave, &tio2) != 0)
  71                         return -1;
  72                 if (tio != NULL)
  73                         memcpy(tio2.c_cc, tio->c_cc, sizeof tio2.c_cc);
  74                 tio2.c_cc[VERASE] = '\177';
  75                 if (tcsetattr(slave, TCSAFLUSH, &tio2) == -1)
  76                         return -1;
  77                 if (ioctl(slave, TIOCSWINSZ, ws) == -1)
  78                         return -1;
  79
  80                 dup2(slave, 0);
  81                 dup2(slave, 1);
  82                 dup2(slave, 2);
  83                 if (slave > 2)
  84                         close(slave);
  85                 return 0;
  86         }
  87
  88         close(slave);
  89         return pid;
  90
  91 out:
  92         if (*master != -1)
  93                 close(*master);
  94         if (slave != -1)
  95                 close(slave);
  96         return -1;
  97 }