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/*
* Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stropts.h>
#include <unistd.h>
#include <errno.h>
#include "compat.h"
void fatal(const char *, ...);
void fatalx(const char *, ...);
pid_t
forkpty(int *master, __unused char *name, struct termios *tio,
struct winsize *ws)
{
int slave = -1, fd, pipe_fd[2];
char *path, dummy;
pid_t pid;
if (pipe(pipe_fd) == -1)
return (-1);
if ((*master = open("/dev/ptc", O_RDWR|O_NOCTTY)) == -1)
goto out;
if ((path = ttyname(*master)) == NULL)
goto out;
if (name != NULL)
strlcpy(name, path, TTY_NAME_MAX);
if ((slave = open(path, O_RDWR|O_NOCTTY)) == -1)
goto out;
switch (pid = fork()) {
case -1:
goto out;
case 0:
close(*master);
close(pipe_fd[1]);
while (read(pipe_fd[0], &dummy, 1) == -1) {
if (errno != EINTR)
break;
}
close(pipe_fd[0]);
fd = open(_PATH_TTY, O_RDWR|O_NOCTTY);
if (fd >= 0) {
ioctl(fd, TIOCNOTTY, NULL);
close(fd);
}
if (setsid() < 0)
fatal("setsid");
fd = open(_PATH_TTY, O_RDWR|O_NOCTTY);
if (fd >= 0)
fatalx("open succeeded (failed to disconnect)");
fd = open(path, O_RDWR);
if (fd < 0)
fatal("open failed");
close(fd);
fd = open("/dev/tty", O_WRONLY);
if (fd < 0)
fatal("open failed");
close(fd);
if (tio != NULL && tcsetattr(slave, TCSAFLUSH, tio) == -1)
fatal("tcsetattr failed");
if (ioctl(slave, TIOCSWINSZ, ws) == -1)
fatal("ioctl failed");
dup2(slave, 0);
dup2(slave, 1);
dup2(slave, 2);
if (slave > 2)
close(slave);
return (0);
}
close(slave);
close(pipe_fd[0]);
close(pipe_fd[1]);
return (pid);
out:
if (*master != -1)
close(*master);
if (slave != -1)
close(slave);
close(pipe_fd[0]);
close(pipe_fd[1]);
return (-1);
}
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